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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>
    </build-info>


<item>
            <title>[SERVER-33504] Write performance tests for resmoke.py logging to console and to logkeeper</title>
                <link>https://jira.mongodb.org/browse/SERVER-33504</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26445&quot; title=&quot;resmoke.py&amp;#39;s LoggerPipe threads can stop consuming output from their pipes for long periods&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26445&quot;&gt;&lt;del&gt;SERVER-26445&lt;/del&gt;&lt;/a&gt; was a bug in resmoke.py that caused arbitrarily long delays between the time when a process would write to its output pipe and the time when resmoke.py would read the log message. This would cause problems for programs such as mongod that rely on writing logs messages to be fast in order to avoid holding &lt;tt&gt;LockManager&lt;/tt&gt; locks and/or mutexes for long periods of time, thereby blocking other threads from doing useful work. In particular, this would manifest as the primary stepping down due to the secondary being unable to respond to heartbeat messages while the &lt;tt&gt;ReplicationCoordinatorImpl::_mutex&lt;/tt&gt; is held.&lt;/p&gt;

&lt;p&gt;Even after the changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26445&quot; title=&quot;resmoke.py&amp;#39;s LoggerPipe threads can stop consuming output from their pipes for long periods&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26445&quot;&gt;&lt;del&gt;SERVER-26445&lt;/del&gt;&lt;/a&gt; where committed, we&apos;ve seen other cases of time drift between the timestamp that resmoke.py reports and the timestamp that mongod reports.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;BF-4604, BF-4970, BF-6290 are other Evergreen failures where there was an apparent time drift between the timestamp that the MongoDB process reports and the timestamp that resmoke.py reports despite having the changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26445&quot; title=&quot;resmoke.py&amp;#39;s LoggerPipe threads can stop consuming output from their pipes for long periods&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26445&quot;&gt;&lt;del&gt;SERVER-26445&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/BF-6557?focusedCommentId=1674918&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1674918&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/BF-6557?focusedCommentId=1674918&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1674918&lt;/a&gt;&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Additionally, we&apos;ve also see cases (namely those linked to MCI-2631) where resmoke.py itself gets blocked writing to its output pipe and becomes unable to consume log messages from its subprocesses. The GIL in CPython isn&apos;t held while doing I/O, so it is unexpected that the &lt;tt&gt;LoggerPipe&lt;/tt&gt; threads wouldn&apos;t be able to continue consuming log messages.&lt;/p&gt;</description>
                <environment></environment>
        <key id="481081">SERVER-33504</key>
            <summary>Write performance tests for resmoke.py logging to console and to logkeeper</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Jan 2018 15:58:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:25 +0000</updated>
                            <resolved>Wed, 28 Feb 2018 22:53:19 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1819261" author="xgen-internal-githook" created="Wed, 28 Feb 2018 22:53:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33504&quot; title=&quot;Write performance tests for resmoke.py logging to console and to logkeeper&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33504&quot;&gt;&lt;del&gt;SERVER-33504&lt;/del&gt;&lt;/a&gt; Add test suite for resmoke.py logging performance.&lt;/p&gt;

&lt;p&gt;Runs a configurable number of &quot;yes&quot; processes for the specified amount&lt;br/&gt;
of time (in seconds).&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e25af89eaa5fcfd3b5395b766eef4c7d93f44442&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e25af89eaa5fcfd3b5395b766eef4c7d93f44442&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1809738" author="max.hirschhorn@10gen.com" created="Tue, 20 Feb 2018 01:22:56 +0000"  >&lt;p&gt;The lower &lt;tt&gt;# log messages&lt;/tt&gt; results for &lt;tt&gt;# executables = 5&lt;/tt&gt; indicates that the &lt;tt&gt;&amp;#45;&amp;#45;log=buildlogger&lt;/tt&gt; mechanism is causing &lt;tt&gt;yes&lt;/tt&gt; processes to block more frequently than with the &lt;tt&gt;&amp;#45;&amp;#45;log=console&lt;/tt&gt; or &lt;tt&gt;&amp;#45;&amp;#45;log=file&lt;/tt&gt; mechanisms. It would be interesting to use a Python profile (e.g. &lt;a href=&quot;https://docs.python.org/2/library/profile.html#module-cProfile&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;cProfile&lt;/tt&gt;&lt;/a&gt;, &lt;a href=&quot;https://pypi.python.org/pypi/yappi&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;yappi&lt;/tt&gt;&lt;/a&gt;, &lt;a href=&quot;https://github.com/uber/pyflame&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;pyflame&lt;/tt&gt;&lt;/a&gt;) to better understand where time is being spent by the &lt;tt&gt;LoggerPipe&lt;/tt&gt; threads.&lt;/p&gt;

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&lt;td class=&apos;confluenceTd&apos;&gt;64.69&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;The following patterns were used to count the number of log messages under each of the different mechanisms. It is also worth noting that the &lt;tt&gt;build_num&lt;/tt&gt; in the &lt;tt&gt;mci.buildlogger&lt;/tt&gt; file were changed to ensure that a different &lt;tt&gt;build_id&lt;/tt&gt; would be returned by logkeeper.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &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-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;# For --log=console&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;grep -o -E &quot;\[YesFixture:job0\] y{100}&quot; temp.log | wc -l&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;# For --log=file&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;grep -o -E &quot;\[YesFixture:job0\] y{100}&quot; fixture.log | wc -l&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;# For --log=buildlogger&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;curl &apos;https://logkeeper.mongodb.org/build/{build_id}/all?raw=1&apos; -o temp.log; grep -o -E &quot;\[YesFixture:job0\] y{100}&quot; temp.log | wc -l&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
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