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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-20944] Contention on ThreadPoolTaskExecutor::_mutex</title>
                <link>https://jira.mongodb.org/browse/SERVER-20944</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The new mongos query path schedules commands to run on the shards using the ThreadPoolTaskExecutor attached to Grid. There is a single instance of the ThreadPoolTaskExecutor per mongos process which synchronizes access to its internal queues through a single mutex. Performance testing has shown that, when there are a sufficient number of concurrent queries executing on mongos, the threads spend much of their time blocked waiting to acquire this lock. Hacking mongos to create a ThreadPoolTaskExecutor per connection thread shows a 3X increase in throughput for a find-by-_id benchRun() workload.&lt;/p&gt;

&lt;p&gt;For reference, I&apos;m using the following script to generate load on mongos:&lt;/p&gt;
&lt;p/&gt;
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						&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;#!/bin/bash&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;THREADS=$1&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;BENCH_SECONDS=$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;RPC=opQueryOnly&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;PORT=20004&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;./mongo --port $PORT --quiet --eval &apos;db.foo.insert({_id:1})&apos;&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;./mongo --port $PORT --rpcProtocols $RPC --eval &apos;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;ops = [{op:&quot;find&quot;, ns:&quot;test.foo&quot;, query: {_id: 1}}]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;results = benchRun({ops:ops, parallel:&apos;$THREADS&apos;, seconds:&apos;$BENCH_SECONDS&apos;, host:&quot;localhost:&apos;$PORT&apos;&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;print(Math.round(results[&quot;totalOps/s&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;   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;&apos;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="234553">SERVER-20944</key>
            <summary>Contention on ThreadPoolTaskExecutor::_mutex</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Oct 2015 17:20:38 +0000</created>
                <updated>Wed, 2 Dec 2015 18:42:04 +0000</updated>
                            <resolved>Mon, 9 Nov 2015 22:44:47 +0000</resolved>
                                    <version>3.1.9</version>
                                    <fixVersion>3.2.0-rc3</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1083846" author="david.storch" created="Mon, 9 Nov 2015 22:44:34 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;, agreed.&lt;/p&gt;</comment>
                            <comment id="1083771" author="schwerin" created="Mon, 9 Nov 2015 21:45:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;, I propose that we resolve this ticket, now, and do follow on performance work on separate task tickets.&lt;/p&gt;</comment>
                            <comment id="1083767" author="xgen-internal-githook" created="Mon, 9 Nov 2015 21:43:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20944&quot; title=&quot;Contention on ThreadPoolTaskExecutor::_mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20944&quot;&gt;&lt;del&gt;SERVER-20944&lt;/del&gt;&lt;/a&gt; Replace Event on CallbackState with condition variable.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/516a702d8fe87338d8b5e10ab6f2c4939ccbd5f8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/516a702d8fe87338d8b5e10ab6f2c4939ccbd5f8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1083766" author="xgen-internal-githook" created="Mon, 9 Nov 2015 21:43:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20944&quot; title=&quot;Contention on ThreadPoolTaskExecutor::_mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20944&quot;&gt;&lt;del&gt;SERVER-20944&lt;/del&gt;&lt;/a&gt; Move as much work as possible outside of ThreadPoolTaskExecutor critical sections.&lt;/p&gt;

&lt;p&gt;This patch moves calls to the NetworkInterface and heap allocations out from&lt;br/&gt;
under the ThreadPoolTaskExecutor&apos;s mutex, to minimize critical length and&lt;br/&gt;
maximize available concurrency.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fa038b8375fd5aea4d359fe0968beb948de58782&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fa038b8375fd5aea4d359fe0968beb948de58782&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1082322" author="xgen-internal-githook" created="Fri, 6 Nov 2015 22:29:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20944&quot; title=&quot;Contention on ThreadPoolTaskExecutor::_mutex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20944&quot;&gt;&lt;del&gt;SERVER-20944&lt;/del&gt;&lt;/a&gt; distribute mongos work across multiple TaskExecutors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9838ca50e1e5518d9005737ae5d25683acc20cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9838ca50e1e5518d9005737ae5d25683acc20cc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1071810" author="schwerin" created="Tue, 27 Oct 2015 16:53:52 +0000"  >&lt;p&gt;Taking this back, to focus on shortening critical sections in ThreadPoolTaskExecutor.&lt;/p&gt;</comment>
                            <comment id="1070394" author="schwerin" created="Mon, 26 Oct 2015 15:11:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt;, recent evidence suggests (per our discussion on Friday) that the actual contention is inside NetworkInterfaceASIO. If you want to use this ticket to track that side of the investigation, you&apos;re welcome to it. Otherwise, maybe close it as Incomplete and we can reopen if it resurfaces as part of the ASIO performance investigation or elsewhere.&lt;/p&gt;</comment>
                            <comment id="1061990" author="david.storch" created="Thu, 15 Oct 2015 18:53:28 +0000"  >&lt;p&gt;Attaching screenshot of vTune Locks and Waits analysis.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="231248">SERVER-20596</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="240517">SERVER-21597</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                            <attachment id="94242" name="vtune_locks_and_waits.png" size="232886" author="david.storch@mongodb.com" created="Thu, 15 Oct 2015 18:53:28 +0000"/>
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