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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-30613] Excessive threads and lower performance with adaptive service executor</title>
                <link>https://jira.mongodb.org/browse/SERVER-30613</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After eliminating the impact of markThreadIdle (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30609&quot; title=&quot;Investigate need for markThreadIdle with adaptive service executor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30609&quot;&gt;&lt;del&gt;SERVER-30609&lt;/del&gt;&lt;/a&gt;) we see some additional issues with the adaptive service executor. These appear to be related so covering both for now in one ticket.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/163114/163114_schedule.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;The four runs are&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;*&lt;b&gt;synchronous, 3.5.11&lt;/b&gt;*&lt;/li&gt;
	&lt;li&gt;*&lt;b&gt;synchronous, 3.5.11 with markThreadIdle eliminated.&lt;/b&gt;* This shows that eliminating markThreadIdle gives a small performance boost even for the synchronous case in this test, so using this as a basis for comparison for the adaptive tests.&lt;/li&gt;
	&lt;li&gt;*&lt;b&gt;adaptive, 3.5.11 with markThreadIdle eliminated.&lt;/b&gt;* After eliminating markThreadIdle we still see a performance deficit relative to synchronous, excessive threads (600-700 threads for only 500 connections), and a performance drop associated with increased calls to schedule at B. (Note: ignore the burst of calls to schedule at the beginning of each run; these were associated with the inserts to set up the data at the beginning of the run).&lt;/li&gt;
	&lt;li&gt;*&lt;b&gt;adaptive, 3.5.11 with markThreadIdle eliminated, plus exp.diff.&lt;/b&gt;* Experimental patch (attached) that eliminates (apparently) unnecessary calls to schedule has fixed those problems: performance is comparable to the synchronous case (exceeding it slightly at low thread count), number of threads is well-behaved, never exceeding 350, rate of calls to schedule stays steady at about 2x rate of operations.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;My suspicion is that the unnecessary calls to schedule were fooling the adaptive executor into thinking it needed more threads than it actually did.&lt;/p&gt;

&lt;p&gt;Test program attached. Run as follows:&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;# compile&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;mjar=$(ls mongo-java-driver-*.jar)&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;mkdir -p load&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;javac -cp $mjar -Xlint:deprecation load.java -d load&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;# run&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;java -cp load:$mjar load host=... op=ramp_update docs=1000000 threads=500 tps=10 qps=1000 dur=150 size=100 updates=10&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;This&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;initializes with 1000000 docs&lt;/li&gt;
	&lt;li&gt;ramps up the load to 500 threads at 10 new threads per second&lt;/li&gt;
	&lt;li&gt;attempts up to 1000 queries per second on each thread&lt;/li&gt;
	&lt;li&gt;runs each thread for 150 seconds&lt;/li&gt;
	&lt;li&gt;document size is 100&lt;/li&gt;
	&lt;li&gt;10 updates per query&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Test runs above had one 24-cpu machine for mongod and another for the java client.&lt;/p&gt;</description>
                <environment></environment>
        <key id="415481">SERVER-30613</key>
            <summary>Excessive threads and lower performance with adaptive service executor</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13201">Fixed</resolution>
                                        <assignee username="jonathan.reams@mongodb.com">Jonathan Reams</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Aug 2017 14:44:20 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:25 +0000</updated>
                            <resolved>Thu, 21 Sep 2017 15:31:35 +0000</resolved>
                                                    <fixVersion>3.6.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1677673" author="xgen-internal-githook" created="Wed, 20 Sep 2017 15:38:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jbreams@mongodb.com&apos;, &apos;name&apos;: &apos;Jonathan Reams&apos;, &apos;username&apos;: &apos;jbreams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30613&quot; title=&quot;Excessive threads and lower performance with adaptive service executor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30613&quot;&gt;&lt;del&gt;SERVER-30613&lt;/del&gt;&lt;/a&gt; Make adaptive executor separate task types when avoiding starvation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/12648f2b54c9662c9809ef24b779118cb90771bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/12648f2b54c9662c9809ef24b779118cb90771bb&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="163113" name="exp.diff" size="2358" author="bruce.lucas@mongodb.com" created="Fri, 11 Aug 2017 14:42:20 +0000"/>
                            <attachment id="163112" name="load.java" size="10681" author="bruce.lucas@mongodb.com" created="Fri, 11 Aug 2017 14:42:20 +0000"/>
                            <attachment id="163114" name="schedule.png" size="177774" author="bruce.lucas@mongodb.com" created="Fri, 11 Aug 2017 14:42:09 +0000"/>
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