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<channel>
    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-72273] Allow for dynamic loose build mode to prevent relinking</title>
                <link>https://jira.mongodb.org/browse/SERVER-72273</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When I make a modification to src/mongo/db/db_raii.cpp, and recompile the server, it generates 245 &quot;compile tasks&quot; and takes about 2 minutes. It seems like a change to one cpp file should not require all this extra work, especially since I&apos;m using dynamic linking. Here&apos;s a sample of the tasks generated:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;(env) ~/code/mongo$ ninja -j200 -v -f debug.ninja install-devcore&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[1/245 (  0%) 28.073s] rm -f build/debug/mongo/db/db_raii.dyn.o; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/matthewsaltz/code/mongo/build/scons/icecream/debug/run-icecc.sh&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/opt/mongodbtoolchain/v4/bin/ccache /opt/mongodbtoolchain/v4/bin/g++ @build/debug/mongo/db/db_raii.dyn.o.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[2/245 (  0%) 29.422s] rm -f build/debug/mongo/db/libshard_role.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/matthewsaltz/code/mongo/build/scons/icecream/debug/run-icecc.sh&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/usr/bin/icerun /opt/mongodbtoolchain/v4/bin/g++ @build/debug/mongo/db/libshard_role.so.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[3/245 (  1%) 29.431s] rm -f build/install/lib/libshard_role.so; ln build/debug/mongo/db/libshard_role.so build/install/lib/libshard_role.so || install build/debug/mongo/db/libshard_role.so build/install/lib/libshard_role.so&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[4/245 (  1%) 30.438s] rm -f build/debug/mongo/db/stats/liblatency_server_stats.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/matthewsaltz/code/mongo/build/scons/icecream/debug/run-icecc.sh&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/usr/bin/icerun /opt/mongodbtoolchain/v4/bin/g++ @build/debug/mongo/db/stats/liblatency_server_stats.so.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[5/245 (  2%) 30.441s] rm -f build/install/lib/liblatency_server_stats.so; ln build/debug/mongo/db/stats/liblatency_server_stats.so build/install/lib/liblatency_server_stats.so || install build/debug/mongo/db/stats/liblatency_server_stats.so build/install/lib/liblatency_server_stats.so&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[6/245 (  2%) 30.452s] rm -f build/debug/mongo/db/storage/liboplog_cap_maintainer_thread.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/matthewsaltz/code/mongo/build/scons/icecream/debug/run-icecc.sh&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/usr/bin/icerun /opt/mongodbtoolchain/v4/bin/g++ @build/debug/mongo/db/storage/liboplog_cap_maintainer_thread.so.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[7/245 (  2%) 30.455s] rm -f build/install/lib/liboplog_cap_maintainer_thread.so; ln build/debug/mongo/db/storage/liboplog_cap_maintainer_thread.so build/install/lib/liboplog_cap_maintainer_thread.so || install build/debug/mongo/db/storage/liboplog_cap_maintainer_thread.so build/install/lib/liboplog_cap_maintainer_thread.so&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[8/245 (  3%) 30.465s] rm -f build/debug/mongo/db/repl/libreplication_consistency_markers_impl.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/matthewsaltz/code/mongo/build/scons/icecream/debug/run-icecc.sh&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/usr/bin/icerun /opt/mongodbtoolchain/v4/bin/g++ @build/debug/mongo/db/repl/libreplication_consistency_markers_impl.so.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[9/245 (  3%) 30.469s] rm -f build/install/lib/libreplication_consistency_markers_impl.so; ln build/debug/mongo/db/repl/libreplication_consistency_markers_impl.so build/install/lib/libreplication_consistency_markers_impl.so || install build/debug/mongo/db/repl/libreplication_consistency_markers_impl.so build/install/lib/libreplication_consistency_markers_impl.so&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[10/245 (  4%) 30.520s] rm -f build/debug/mongo/db/catalog/libvalidate_state.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/matthewsaltz/code/mongo/build/scons/icecream/debug/run-icecc.sh&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/usr/bin/icerun /opt/mongodbtoolchain/v4/bin/g++ @build/debug/mongo/db/catalog/libvalidate_state.so.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[11/245 (  4%) 30.524s] rm -f build/install/lib/libvalidate_state.so; ln build/debug/mongo/db/catalog/libvalidate_state.so build/install/lib/libvalidate_state.so || install build/debug/mongo/db/catalog/libvalidate_state.so build/install/lib/libvalidate_state.so&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Here&apos;s the function I used to build debug.ninja:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   function buildninjaicdebug() {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;       python ./buildscripts/scons.py  \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           --variables-files=etc/scons/mongodbtoolchain_stable_gcc.vars \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           MONGO_VERSION=$(git describe --abbrev=0 | tail -c+2) \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           --ssl --dbg --opt=off --link-model=dynamic \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           VARIANT_DIR=debug \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           --ninja generate-ninja ICECC=icecc CCACHE=ccache NINJA_PREFIX=debug&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;For a full repro this should do it:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;       python ./buildscripts/scons.py  \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           --variables-files=etc/scons/mongodbtoolchain_stable_gcc.vars \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           MONGO_VERSION=$(git describe --abbrev=0 | tail -c+2) \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           --ssl --dbg --opt=off --link-model=dynamic \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           VARIANT_DIR=debug \&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           --ninja generate-ninja ICECC=icecc CCACHE=ccache NINJA_PREFIX=debug&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;       ninja -j200 -f debug.ninja install-devcore&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;       touch src/mongo/db/db_raii.cpp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;       ninja -j200 -f debug.ninja install-devcore&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="2216132">SERVER-72273</key>
            <summary>Allow for dynamic loose build mode to prevent relinking</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Dec 2022 16:14:11 +0000</created>
                <updated>Fri, 2 Feb 2024 19:56:57 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="6026388" author="matt.broadstone" created="Fri, 19 Jan 2024 18:03:58 +0000"  >&lt;p&gt;Can we please re-consider this feature, or something that addresses the original ask. It sounds like we have a few options which might be:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;add a new &lt;tt&gt;dynamic-loose&lt;/tt&gt; profile&lt;/li&gt;
	&lt;li&gt;audit public LIBDEPS and determine if we can reduce the links between libraries&lt;/li&gt;
	&lt;li&gt;??? something else&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I&apos;m making a small change to &lt;tt&gt;db_s_config_server_test&lt;/tt&gt; and the link time is ~65s right now, which is just long enough for me to get distracted and read some other Jira ticket or slack while waiting to recompile my unit tests. Working with unit tests should be a joyful, fast iterative experience. What can we do to move in that direction?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="5068819" author="JIRAUSER1253549" created="Tue, 20 Dec 2022 21:54:01 +0000"  >&lt;p&gt;I think a good solution here is a command line option which will allow very loose linking, like `--link-model=dynamic-loose` where the libraries don&apos;t get relinked because dependent shared objects are changed. This will skip any build time checks for symbol resolution and you will see any undefined refs at runtime.&lt;/p&gt;</comment>
                            <comment id="5068736" author="JIRAUSER1253549" created="Tue, 20 Dec 2022 21:32:22 +0000"  >&lt;blockquote&gt;&lt;p&gt;I&apos;d expect, for example, at least 10 parts being processed in parallel. Which would bring the recompile down from 180 seconds to ~20.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;I don&apos;t know where you get this figure from, but it just depends on the levels of dependency in the particular situation. Looking at the graph paths, I printed the longest length dependency path using networkx between mongod and libshard_role (where db_raii is linked in), and its 30 levels of dependency, this mostly like is the bottle neck. Those links must be done consecutively in 30 separate links. Actually in a static build there the .a libraries are not dependent on each other and more concurrency can be done just in the context of just libraries (Note not counting Programs).&lt;/p&gt;

&lt;p&gt;The db_raii.cpp just happens to be somewhat deep in dependencies. If you chose a different file it could be worse or better depending on its location in the dependency tree. For example touching a source file in the shell:&lt;/p&gt;


&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;(venv) Dec.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;20&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;03&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;04&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; ubuntu[mongo]: touch src/mongo/shell/mongo.cpp&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;(venv) Dec.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;20&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;03&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;04&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; ubuntu[mongo]: time ninja -j200 -f debug.ninja install-devcore&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;3&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;3&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;] Installed build/install/bin/mongo&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;real	0m0.520s&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;user	0m0.404s&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sys	0m0.116s &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The premise of dynamic link model is not to improve incremental rebuilds. It was originally intended to reduce memory pressure and therefore allow greater linking concurrency. In the context of a full build, we link 100s of binaries, and in a static link build each can take somewhere between 5GB to 10GB, this can easily OOM a system. Dynamic link model considerably reduces the memory, and is generally faster than the same static link (due to being able to skip out on transitive symbol refs), but in some cases can require more links depending on the situation.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="5068342" author="daniel.gottlieb@10gen.com" created="Tue, 20 Dec 2022 19:12:15 +0000"  >&lt;p&gt;I ran an experiment to just do static linking. It&apos;s taking ~13 seconds. Is there a reason to use dynamic linking if it&apos;s not effective in the incremental case?&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;dgottlieb@chimichurri ~/xgen/mongo[master]$ cat static_mongod_ninja_db_raii_j1.log &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[1/4 ( 25%) 0.838s] rm -f build/newninja/mongo/db/db_raii.o; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/dgottlieb/xgen/mongo/build/scons/icecream/newninja/run-icecc.sh&apos;;export ICECC_CLANG_REMOTE_CPP=&apos;1&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/opt/mongodbtoolchain/v4/bin/ccache /opt/mongodbtoolchain/v4/bin/clang++ @build/newninja/mongo/db/db_raii.o.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[2/4 ( 50%) 0.841s] rm -f build/newninja/mongo/db/libshard_role.a; touch build/newninja/mongo/db/libshard_role.a&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[3/4 ( 75%) 12.177s] rm -f build/newninja/mongo/db/mongod; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/dgottlieb/xgen/mongo/build/scons/icecream/newninja/run-icecc.sh&apos;;export ICECC_CLANG_REMOTE_CPP=&apos;1&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/bin/icerun /opt/mongodbtoolchain/v4/bin/clang++ @build/newninja/mongo/db/mongod.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[4/4 (100%) 12.809s] rm -f bin/mongod; ln build/newninja/mongo/db/mongod bin/mongod || install build/newninja/mongo/db/mongod bin/mongod&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;&lt;b&gt;Edit&lt;/b&gt;&lt;br/&gt;
The above experiment is just touching a file. Ninja seems to nose out what file I touched but isn&apos;t doing any interesting work. Changing the contents of the file yields a different result. But it&apos;s still faster than dynamic linking:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;dgottlieb@chimichurri ~/xgen/mongo[master]$ ninja -v -f enterprise.static.ninja -j 300 bin/mongod&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[1/4 ( 25%) 25.080s] rm -f build/newninja/mongo/db/db_raii.o; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/dgottlieb/xgen/mongo/build/scons/icecream/newninja/run-icecc.sh&apos;;export ICECC_CLANG_REMOTE_CPP=&apos;1&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/opt/mongodbtoolchain/v4/bin/ccache /opt/mongodbtoolchain/v4/bin/clang++ @build/newninja/mongo/db/db_raii.o.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[2/4 ( 50%) 25.087s] rm -f build/newninja/mongo/db/libshard_role.a; touch build/newninja/mongo/db/libshard_role.a&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[3/4 ( 75%) 42.391s] rm -f build/newninja/mongo/db/mongod; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/dgottlieb/xgen/mongo/build/scons/icecream/newninja/run-icecc.sh&apos;;export ICECC_CLANG_REMOTE_CPP=&apos;1&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/bin/icerun /opt/mongodbtoolchain/v4/bin/clang++ @build/newninja/mongo/db/mongod.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[4/4 (100%) 42.400s] rm -f bin/mongod; ln build/newninja/mongo/db/mongod bin/mongod || install build/newninja/mongo/db/mongod bin/mongod&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The dynamic linking experiment I ran did both of touching a file (the -j1) and editing the file (-j 300). For the better apples to apples:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Touching a file + -j300:
	&lt;ul&gt;
		&lt;li&gt;Static: 12s&lt;/li&gt;
		&lt;li&gt;Dynamic: 80s&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Editing a file + -j300:
	&lt;ul&gt;
		&lt;li&gt;Static: 43s&lt;/li&gt;
		&lt;li&gt;Dynamic: 115s&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5068302" author="daniel.gottlieb@10gen.com" created="Tue, 20 Dec 2022 18:56:36 +0000"  >&lt;p&gt;I&apos;ve added my log files from ninja -v when recompiling after touching only db_raii.cpp&lt;/p&gt;</comment>
                            <comment id="5068291" author="daniel.gottlieb@10gen.com" created="Tue, 20 Dec 2022 18:52:50 +0000"  >&lt;blockquote&gt;
&lt;p&gt;The link steps happen in parallel. The install steps (rm + ln) also are in parallel and are relatively fast (10s of milliseconds).&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;How in parallel are they? The numbers aren&apos;t adding up. &lt;/p&gt;

&lt;p&gt;I&apos;m able to reproduce &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matthew.saltz%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matthew.saltz@mongodb.com&quot;&gt;matthew.saltz@mongodb.com&lt;/a&gt;&apos;s observation. When I run with j1 as a baseline I get ~3 minutes:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[271/271 (100%) 187.366s] rm -f bin/mongod; ln build/newninja/mongo/db/mongod bin/mongod || install build/newninja/mongo/db/mongod bin/mongod&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;When I run with j300 (certainly larger than whatever size pool ninja is configured to use) that only brings the runtime down to ~2 minutes. I&apos;d expect, for example, at least 10 parts being processed in parallel. Which would bring the recompile down from 180 seconds to ~20.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[271/271 (100%) 112.854s] rm -f bin/mongod; ln build/newninja/mongo/db/mongod bin/mongod || install build/newninja/mongo/db/mongod bin/mongod&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I agree with the observation that 10s of milliseconds is typical. But I also see some 1+ second blips (from the -j1 logs):&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[39/271 ( 14%) 47.282s] rm -f build/newninja/mongo/db/serverless/libshard_split_state_machine.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/dgottlieb/xgen/mongo/build/scons/icecream/newninja/run-icecc.sh&apos;;export ICECC_CLANG_REMOTE_CPP=&apos;1&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/bin/icerun /opt/mongodbtoolchain/v4/bin/clang++ @build/newninja/mongo/db/serverless/libshard_split_state_machine.so.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[40/271 ( 14%) 48.657s] rm -f build/newninja/mongo/db/repl/libtenant_migration_access_blocker.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/dgottlieb/xgen/mongo/build/scons/icecream/newninja/run-icecc.sh&apos;;export ICECC_CLANG_REMOTE_CPP=&apos;1&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/b&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[41/271 ( 15%) 49.766s] rm -f build/newninja/mongo/db/libread_concern_d_impl.so; export CCACHE_NOCPP2=&apos;1&apos;;export CCACHE_PREFIX=&apos;/home/dgottlieb/xgen/mongo/build/scons/icecream/newninja/run-icecc.sh&apos;;export ICECC_CLANG_REMOTE_CPP=&apos;1&apos;;export PATH=&apos;/opt/mongodbtoolchain/v4/bin:/usr/local/bin:/opt/bin:/bin:/usr/bin&apos;;/bin/icerun /opt/mongodbtoolchain/v4/bin/clang++ @build/newninja/mongo/db/libread_concern_d_impl.so.rsp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;To be clear of what (my) asks are here: &lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;I am not asking for this to be a top priority ticket to fix.&lt;/li&gt;
	&lt;li&gt;I am* asking to understand what the expected parallelism is. I expect the back of the envelop math to support the hypothesis.&lt;/li&gt;
	&lt;li&gt;I&apos;m also asking: What&apos;s the consequence of not doing all those rm + ln steps? What would a user have to do between changing files and/or changing scons/ninja flags such that running mongod wouldn&apos;t work correctly? The explanation including public libdeps helps inform what&apos;s getting rm + ln&apos;ed due to changing a source file. But I&apos;m not picking up on why that&apos;s important. My mental model regarding shared library builds is that changing one cpp file should rewrite one .so file. And nothing else is necessary to run the updated code.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5067994" author="JIRAUSER1253549" created="Tue, 20 Dec 2022 17:39:23 +0000"  >&lt;blockquote&gt;&lt;p&gt;Is there an option that lets the rm + ln/install steps happen in parallel? Also curious if there&apos;s a correctness concern there.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;The link steps happen in parallel. The install steps (rm + ln) also are in parallel and are relatively fast (10s of milliseconds).&lt;/p&gt;</comment>
                            <comment id="5067946" author="daniel.gottlieb@10gen.com" created="Tue, 20 Dec 2022 17:23:06 +0000"  >&lt;p&gt;Is there an option that lets the rm + ln/install steps happen in parallel? Also curious if there&apos;s a correctness concern there.&lt;/p&gt;</comment>
                            <comment id="5067909" author="JIRAUSER1253549" created="Tue, 20 Dec 2022 17:07:45 +0000"  >&lt;p&gt;We use build time symbol resolution and explicitly make these dependencies and relink all the libraries to recheck all symbols still correctly resolve so there are no issues at runtime. So you change a library which other libraries linked to, and everything is rechecked to make sure when the binary runs all symbols refs are satisfied.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;That said, the overuse of PUBLIC libdeps means that there are unnecessary dependencies and links. And we could make a command line option feature so that you can build without z,defs (build time symbol resolution) and we can remove the dependencies so nothing is relinked besides the library you changed the cpp in.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="423002" name="dynamic_mongod_ninja_db_raii_j1.log" size="94218" author="daniel.gottlieb@mongodb.com" created="Tue, 20 Dec 2022 18:55:51 +0000"/>
                            <attachment id="423003" name="dynamic_mongod_ninja_db_raii_j300.log" size="94057" author="daniel.gottlieb@mongodb.com" created="Tue, 20 Dec 2022 18:56:10 +0000"/>
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