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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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            <title>[SERVER-7346] Performance regression in v2.2: write lock upgrading</title>
                <link>https://jira.mongodb.org/browse/SERVER-7346</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is a case of significant reduction in performance when under heavy write load.&lt;/p&gt;

&lt;p&gt;The attached Java test client (MongoBenchTest.java) starts with 1 thread and ramps up to 10 threads, each inserting into a unique db with safe wc.  Basically, once the durability thread has trouble keeping up, we start seeing commitIfNeeded upgrade the db lock from shared to exclusive write, and with 10 threads, the overall insert rate drops by ~50% compared to 1 thread.  Disabling journaling results in much faster results, but it&apos;s just a tad faster than v2.0.7 with journaling enabled.  v2.0.7 w/o journaling is the fastest.&lt;/p&gt;</description>
                <environment>Mac OS X</environment>
        <key id="53075">SERVER-7346</key>
            <summary>Performance regression in v2.2: write lock upgrading</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="benjamin.becker">Ben Becker</reporter>
                        <labels>
                            <label>performance</label>
                    </labels>
                <created>Sat, 13 Oct 2012 02:51:41 +0000</created>
                <updated>Mon, 11 Jul 2016 17:59:11 +0000</updated>
                            <resolved>Wed, 13 Feb 2013 00:35:17 +0000</resolved>
                                    <version>2.2.0</version>
                                    <fixVersion>2.4.0-rc1</fixVersion>
                                    <component>Concurrency</component>
                    <component>Performance</component>
                                        <votes>3</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="264642" author="redbeard0531" created="Wed, 13 Feb 2013 00:35:17 +0000"  >&lt;p&gt;Just tested on windows with 2.2.3, 2.0.8 and 2.4.0-rc1, and all latencies are the same.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=thomasr&quot; class=&quot;user-hover&quot; rel=&quot;thomasr&quot;&gt;thomasr&lt;/a&gt; Please open a separate ticket for your issue. It doesn&apos;t seem related.&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="20660" name="MongoBenchTest.java" size="8182" author="benjamin.becker" created="Sat, 13 Oct 2012 02:51:41 +0000"/>
                            <attachment id="20878" name="insertion_times_csharp_1M.png" size="77212" author="thomas.rueckstiess@mongodb.com" created="Wed, 17 Oct 2012 02:45:36 +0000"/>
                            <attachment id="20879" name="insertion_times_journal.png" size="69331" author="thomas.rueckstiess@mongodb.com" created="Wed, 17 Oct 2012 02:45:36 +0000"/>
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