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    <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>
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<item>
            <title>[SERVER-46693] Parallelize debugger processes in hang-analyzer</title>
                <link>https://jira.mongodb.org/browse/SERVER-46693</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Investigate trying to parallelize debugging all of the processes. This is more of a nice to have, so will timebox it to 2 days &lt;span class=&quot;error&quot;&gt;&amp;#91;16 hours&amp;#93;&lt;/span&gt;.&lt;/p&gt;

&lt;p&gt;The risk in this ticket is that parallelizing debugger processes could use too much memory (by trying to load debug symbols for all process types). Therefore we should only do this if the ticket above does not give us enough performance gain. &lt;/p&gt;

&lt;p&gt;An additional risk is that the overhead of threads could negate the performance increase from parallelization. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1241629">SERVER-46693</key>
            <summary>Parallelize debugger processes in hang-analyzer</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="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="carl.worley@mongodb.com">Raiden Worley</assignee>
                                    <reporter username="vlad.rachev@mongodb.com">Vlad Rachev</reporter>
                        <labels>
                            <label>tig-hanganalyzer</label>
                    </labels>
                <created>Fri, 6 Mar 2020 20:48:19 +0000</created>
                <updated>Wed, 16 Sep 2020 18:43:40 +0000</updated>
                            <resolved>Wed, 22 Apr 2020 21:11:48 +0000</resolved>
                                                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3052635" author="max.hirschhorn@10gen.com" created="Thu, 23 Apr 2020 14:22:36 +0000"  >&lt;p&gt;Chatted with Raiden over Slack and he said he&apos;d continue looking into using SIGSTOP to pause processes before attaching the debugger.&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;(gdb) handle SIGSTOP ignore&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;(gdb) handle SIGSTOP noprint&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;made it so the &lt;tt&gt;mongodb&amp;#45;dump&amp;#45;locks&lt;/tt&gt; command no longer hit the following error from gdb for me locally&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;(gdb) mongodb-dump-locks&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;Running Hang Analyzer Supplement - MongoDBDumpLocks&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;&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;Thread 1 &quot;mongod&quot; received signal SIGSTOP, Stopped (signal).&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::LockManager::dump (this=0x7ffb53f974d0 &amp;lt;mongo::(anonymous namespace)::globalLockManager&amp;gt;) at src/mongo/db/concurrency/lock_manager.cpp:845&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;845    void LockManager::dump() const {&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;Ignoring error &apos;The program being debugged was signaled while in a function called from GDB.&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;GDB remains in the frame where the signal was received.&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;To change this behavior use &quot;set unwindonsignal on&quot;.&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;Evaluation of the expression containing the function&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::LockManager::dump() const) will be abandoned.&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;When the function is done executing, GDB will silently stop.&apos; in dump_mongod_locks&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="3051790" author="carl.worley" created="Wed, 22 Apr 2020 20:29:16 +0000"  >&lt;p&gt;As a sidenote, I tried sending &lt;tt&gt;SIGSTOP&lt;/tt&gt; to all mongods before attaching to any of them as mentioned above, and the outputs seemed the same as without sending the signal. (I got &quot;&lt;tt&gt;Not generating the digraph, since the lock graph is empty&lt;/tt&gt;&quot; from trying to show the waitfor graph). Didn&apos;t get any output from dumping locks in gdb, but did get the log output from the lock manager dump appearing in the server logs. It also didn&apos;t freeze or anything like I would have expected from the comments above. I could confirm that the SIGSTOP was received by trying to connect to the mongod (commenting out the debugger execution).&lt;/p&gt;

&lt;p&gt;I wonder if there were any changes to how the server responds to SIGSTOP, or to how GDB interacts with stopped processes since TIG-768 was first investigated. Might be worth looking into TIG-768 again separately from this.&lt;/p&gt;</comment>
                            <comment id="3051711" author="carl.worley" created="Wed, 22 Apr 2020 20:03:50 +0000"  >&lt;p&gt;Completely parallelizing debugger execution didn&apos;t seem to work. The &lt;tt&gt;mongod.debug&lt;/tt&gt; file takes about 3.1 GB of disk space, and running the hang analyzer on a single mongod shows an increase in memory usage of about 3 GB. This scales with the number of debuggers spawned, so running two debuggers at once uses about 6 GB of memory according to &lt;tt&gt;free&lt;/tt&gt;. It looks like the whole file gets loaded into memory.&lt;/p&gt;

&lt;p&gt;Interestingly, the memory usage didn&apos;t change that much while actually loading symbols, but shot up to 3 GB when dumping threads. I wonder if the &quot;loading symbols&quot; phase is more about &lt;a href=&quot;https://sourceware.org/gdb/current/onlinedocs/gdb/Index-Files.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;indexing&lt;/a&gt; the symbols file, while the symbols are only actually loaded into memory when used?&lt;/p&gt;

&lt;p&gt;Most of this memory usage is in the &lt;tt&gt;buffers/cached&lt;/tt&gt; line of &lt;tt&gt;free&lt;/tt&gt;, so I was hoping that gdb didn&apos;t actually need the whole file in memory and might be smart enough to still work, albeit more slowly, once memory started filling up. I spawned 14 standalone mongods (the -large variant has 30 GB of memory) and ran the parallelized hang analyzer, but memory usage filled up and, right after dumping threads, the output froze and the SSH pipe was broken. Running &lt;tt&gt;grep -i kill /var/log/messages*&lt;/tt&gt; showed a line with &lt;tt&gt;gdb invoked oom-killer&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Since the -small RHEL variant only has 7 GB of memory, I think it&apos;ll struggle to even run two debuggers in parallel, and definitely crash when running for a whole 3-node replset or more. I think re-using loaded symbols in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46682&quot; title=&quot;Reuse debugger process for processes of same type in hang_analyzer.py&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46682&quot;&gt;&lt;del&gt;SERVER-46682&lt;/del&gt;&lt;/a&gt; is a more promising way to improve hang analyzer performance, so we&apos;ll close this one as &quot;won&apos;t fix&quot;.&lt;/p&gt;</comment>
                            <comment id="2975557" author="vlad.rachev" created="Thu, 12 Mar 2020 16:41:35 +0000"  >&lt;p&gt;We&apos;ll investigate this first before &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46682&quot; title=&quot;Reuse debugger process for processes of same type in hang_analyzer.py&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46682&quot;&gt;&lt;del&gt;SERVER-46682&lt;/del&gt;&lt;/a&gt; - if this works out the other ticket won&apos;t be needed. &lt;/p&gt;</comment>
                            <comment id="2961308" author="vlad.rachev" created="Tue, 10 Mar 2020 17:44:57 +0000"  >&lt;p&gt;In the design &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; brought up a good point:&lt;/p&gt;

&lt;p&gt;&quot;I will say I&apos;m in favor of experimenting with this idea (e.g. trying to load symbols after attaching) because freezing the state of the processes at approximately the same moments helps to avoid the cluster state being perturbed with heartbeats not being sent, etc. while the debugger is attached.&quot;&lt;/p&gt;

&lt;p&gt;Given that potential benefit, we will investigate this ticket. As part of the investigation, use large replica sets to test the memory usage.&lt;/p&gt;</comment>
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