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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-22100] memory pressure from find/getMore buffer preallocation causes concurrency suite slowness on Windows DEBUG</title>
                <link>https://jira.mongodb.org/browse/SERVER-22100</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The additional memory pressure from find/getMore buffer preallocation, in conjunction with the overhead CRT heap debugging, causes the concurrency suite (fsm_all_replicated.js) to time out frequently.&lt;/p&gt;

&lt;p&gt;NOTE: This problem only affects DEBUG builds on Windows, so it is not a problem in production.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="246248">SERVER-22100</key>
            <summary>memory pressure from find/getMore buffer preallocation causes concurrency suite slowness on Windows DEBUG</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="adam.midvidy">Adam Midvidy</assignee>
                                    <reporter username="adam.midvidy">Adam Midvidy</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Thu, 7 Jan 2016 23:44:48 +0000</created>
                <updated>Fri, 18 Nov 2016 01:12:05 +0000</updated>
                            <resolved>Mon, 11 Jan 2016 22:50:12 +0000</resolved>
                                                    <fixVersion>3.2.3</fixVersion>
                    <fixVersion>3.3.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1145522" author="xgen-internal-githook" created="Fri, 15 Jan 2016 20:35:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;amidvidy&apos;, u&apos;name&apos;: u&apos;Adam Midvidy&apos;, u&apos;email&apos;: u&apos;amidvidy@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22100&quot; title=&quot;memory pressure from find/getMore buffer preallocation causes concurrency suite slowness on Windows DEBUG&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22100&quot;&gt;&lt;del&gt;SERVER-22100&lt;/del&gt;&lt;/a&gt; do not preallocate find/getMore response buffers on Windows DEBUG&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9cce8846424654653e9449c134fadbe56a7c5df1)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/48a29450239d88607842cb7f2eb7d34d89bbcb1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/48a29450239d88607842cb7f2eb7d34d89bbcb1f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1131818" author="xgen-internal-githook" created="Mon, 11 Jan 2016 22:49:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;amidvidy&apos;, u&apos;name&apos;: u&apos;Adam Midvidy&apos;, u&apos;email&apos;: u&apos;amidvidy@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22100&quot; title=&quot;memory pressure from find/getMore buffer preallocation causes concurrency suite slowness on Windows DEBUG&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22100&quot;&gt;&lt;del&gt;SERVER-22100&lt;/del&gt;&lt;/a&gt; do not preallocate find/getMore response buffers on Windows DEBUG&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9cce8846424654653e9449c134fadbe56a7c5df1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9cce8846424654653e9449c134fadbe56a7c5df1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1131371" author="adam.midvidy" created="Mon, 11 Jan 2016 18:48:08 +0000"  >&lt;p&gt;I&apos;m still investigating the root cause of the slowdown but the patch I submitted for CR does fix the problem. The downside is that we run slightly different code in debug builds, which may cause issues down the line.&lt;/p&gt;</comment>
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