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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-36518] why syn write outperforms  asyn&#65292;why Synchronous writing is better&#65288;async have more asyn thread to consume&#65289;</title>
                <link>https://jira.mongodb.org/browse/SERVER-36518</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;why syn write&#160;outperforms&#160; asyn&#65292;why&#160;Synchronous writing is better&lt;/p&gt;</description>
                <environment></environment>
        <key id="585288">SERVER-36518</key>
            <summary>why syn write outperforms  asyn&#65292;why Synchronous writing is better&#65288;async have more asyn thread to consume&#65289;</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="9">Done</resolution>
                                        <assignee username="nick.brewer">Nick Brewer</assignee>
                                    <reporter username="wocuocuo">yxyxz123456</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Aug 2018 02:19:16 +0000</created>
                <updated>Tue, 4 Sep 2018 03:02:42 +0000</updated>
                            <resolved>Wed, 8 Aug 2018 14:13:42 +0000</resolved>
                                                                    <component>Admin</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1970234" author="nick.brewer" created="Wed, 8 Aug 2018 14:13:10 +0000"  >&lt;p&gt;Thanks for your report. Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related developer discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-dev&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-dev group&lt;/a&gt;, where your question will reach a larger audience.&lt;/p&gt;

&lt;p&gt;-Nick&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;@&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=keith.bostic&quot; class=&quot;user-hover&quot; rel=&quot;keith.bostic&quot;&gt;keith.bostic&lt;/a&gt;&#160;&lt;br/&gt;
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can you help me.&lt;/p&gt;



&lt;p&gt;I always thought asynchronous writing was better than synchronous writing&#65292; but&#160;The test results are opposite.&lt;/p&gt;

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

&lt;p&gt;why syn write&#160;outperforms&#160; asyn&#65292;why&#160;Synchronous writing is better&#65288;async have more asyn thread to consume&#65289;&lt;/p&gt;

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

&lt;p&gt;The test results are as follows&#65306;&lt;/p&gt;

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

&lt;p&gt;1. async&#160;thread config to write:&lt;/p&gt;

&lt;p&gt;root@dprofiler-jvm-00.gz01:/data1/yyz/wtperf-test$&#160;&lt;br/&gt;
root@dprofiler-jvm-00.gz01:/data1/yyz/wtperf-test$ cat WT_TEST/test.stat&#160;&lt;br/&gt;
root@dprofiler-jvm-00.gz01:/data1/yyz/wtperf-test$&#160;&lt;br/&gt;
root@dprofiler-jvm-00.gz01:/data1/yyz/wtperf-test$ ls&lt;br/&gt;
500m-btree-populate.wtperf wtperf WT_TEST&lt;br/&gt;
root@dprofiler-jvm-00.gz01:/data1/yyz/wtperf-test$ tail -f WT_TEST/test.stat&#160;&lt;br/&gt;
Starting 4 populate thread(s) for 50000000 items&lt;br/&gt;
Starting 20 async thread(s)&lt;br/&gt;
5195456 populate inserts (5195456 of 50000000) in 10 secs (10 total secs)&lt;br/&gt;
4915569 populate inserts (10111025 of 50000000) in 10 secs (20 total secs)&lt;br/&gt;
5044813 populate inserts (15155838 of 50000000) in 10 secs (30 total secs)&lt;br/&gt;
5221553 populate inserts (20377391 of 50000000) in 10 secs (40 total secs)&lt;br/&gt;
4905787 populate inserts (25283178 of 50000000) in 10 secs (50 total secs)&lt;br/&gt;
5442404 populate inserts (30725582 of 50000000) in 10 secs (60 total secs)&lt;br/&gt;
4915668 populate inserts (35641250 of 50000000) in 10 secs (70 total secs)&lt;br/&gt;
3652834 populate inserts (39294084 of 50000000) in 10 secs (80 total secs)&lt;br/&gt;
4845839 populate inserts (44139923 of 50000000) in 10 secs (90 total secs)&lt;br/&gt;
5246793 populate inserts (49386716 of 50000000) in 10 secs (100 total secs)&lt;br/&gt;
Finished load of 50000000 items&lt;br/&gt;
Load time: 102.40&lt;br/&gt;
load ops/sec: 488266&lt;br/&gt;
Compact after populate&lt;br/&gt;
Compact completed in 10 seconds&lt;/p&gt;

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

&lt;p&gt;2. no async thread config reusult:&lt;/p&gt;

&lt;p&gt;root@dprofiler-jvm-00.gz01:/data1/yyz/wtperf-test$ tail -f WT_TEST/test.stat&#160;&lt;br/&gt;
Starting 4 populate thread(s) for 50000000 items&lt;br/&gt;
5735292 populate inserts (5735292 of 50000000) in 10 secs (10 total secs)&lt;br/&gt;
5703659 populate inserts (11438951 of 50000000) in 10 secs (20 total secs)&lt;br/&gt;
6021691 populate inserts (17460642 of 50000000) in 10 secs (30 total secs)&lt;br/&gt;
5849552 populate inserts (23310194 of 50000000) in 10 secs (40 total secs)&lt;br/&gt;
5833485 populate inserts (29143679 of 50000000) in 10 secs (50 total secs)&lt;br/&gt;
5780148 populate inserts (34923827 of 50000000) in 10 secs (60 total secs)&lt;br/&gt;
5672788 populate inserts (40596615 of 50000000) in 10 secs (70 total secs)&lt;br/&gt;
5652205 populate inserts (46248820 of 50000000) in 10 secs (80 total secs)&lt;br/&gt;
Finished load of 50000000 items&lt;br/&gt;
Load time: 86.97&lt;br/&gt;
load ops/sec: 574904&lt;br/&gt;
Compact after populate&lt;br/&gt;
Compact completed in 3 seconds&lt;br/&gt;
Run completed&lt;/p&gt;</customfieldvalue>

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