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    <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-32115] Low mongos performance with adaptive Service Executor</title>
                <link>https://jira.mongodb.org/browse/SERVER-32115</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Reproduced on version r3.6.0-rc4-41-ge608b8b349.&lt;/p&gt;

&lt;p&gt;On a two-shard environment, I generated a 100% query workload via the load.java attached (which is a modified version of load.java from &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;).&lt;/p&gt;

&lt;p&gt;Configurations tested:&lt;br/&gt;
A. The sharded cluster operating with synchronous (default) service executor.&lt;br/&gt;
B. The sharded cluster operating with asynchronous (adaptive) service executor.&lt;br/&gt;
C. The sharded cluster operating with asynchronous (adaptive) service executor, except for mongos which was operating in synchronous mode.&lt;/p&gt;

&lt;p&gt;Performance of A and C is comparable, whereas B shows 73% the query throughput of A.&lt;/p&gt;

&lt;p&gt;For the test I used four AWS EC2 m4.4xlarge. One machine for the traffic generator, one for mongos and 1-member config server, and one machine for each shard (1-member replica set).&lt;/p&gt;

&lt;p&gt;Attached logs and diagnostic data for the three configurations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="465487">SERVER-32115</key>
            <summary>Low mongos 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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="josef.ahmad@mongodb.com">Josef Ahmad</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Nov 2017 19:22:41 +0000</created>
                <updated>Tue, 6 Dec 2022 03:45:44 +0000</updated>
                            <resolved>Mon, 8 Jul 2019 15:06:19 +0000</resolved>
                                    <version>3.6.0-rc4</version>
                                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                        <attachments>
                            <attachment id="171972" name="SERVER-32115.tar.gz" size="1542223" author="josef.ahmad@mongodb.com" created="Wed, 29 Nov 2017 20:07:35 +0000"/>
                            <attachment id="171965" name="load.java" size="10266" author="josef.ahmad@mongodb.com" created="Wed, 29 Nov 2017 19:25:27 +0000"/>
                            <attachment id="171968" name="make-sh.js" size="343" author="josef.ahmad@mongodb.com" created="Wed, 29 Nov 2017 19:45:14 +0000"/>
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	&lt;li&gt;Set up a two-shard cluster.&lt;/li&gt;
	&lt;li&gt;On my mongos I passed --setParameter ShardingTaskExecutorPoolMaxSize=100 --setParameter taskExecutorPoolSize=4 (to avoid hitting hard ulimit on open files)&lt;/li&gt;
	&lt;li&gt;Pre-spit the sharded collection with the make-sh.js I attached and wait for the balancing to complete&lt;/li&gt;
	&lt;li&gt;$ java -cp load:mongo-java-driver/mongo-java-driver/build/libs/mongo-java-driver-3.5.0.jar load host=172.31.43.41 op=ramp_query docs=1000000 threads=500 tps=10 qps=1000 dur=600 size=100 updates=10&lt;/li&gt;
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