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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-17251] with journal turned off journal compression option seems to affect throughput</title>
                <link>https://jira.mongodb.org/browse/SERVER-17251</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Trying to test how much journal compression affects throughput with journal turned on, I inadvertently timed multiple runs with journal turned off both with and without journal compression type specified as none (vs snappy).&lt;/p&gt;

&lt;p&gt;Surprisingly I see a consistent difference, where none gives better performance.   But journal compression setting should be irrelevant if journaling is disabled.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="183638">SERVER-17251</key>
            <summary>with journal turned off journal compression option seems to affect throughput</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="5">Cannot Reproduce</resolution>
                                        <assignee username="asya.kamsky@mongodb.com">Asya Kamsky</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 Feb 2015 03:06:59 +0000</created>
                <updated>Wed, 8 Apr 2015 15:48:19 +0000</updated>
                            <resolved>Sun, 22 Feb 2015 20:06:35 +0000</resolved>
                                    <version>3.0.0-rc8</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="834449" author="asya" created="Sun, 22 Feb 2015 20:06:35 +0000"  >&lt;p&gt;seems to have been a statistical fluke, cannot reproduce.&lt;/p&gt;</comment>
                            <comment id="827068" author="adamc" created="Wed, 11 Feb 2015 19:02:20 +0000"  >&lt;p&gt;Did some more testing, cut the threads in half on the client, added zlib for a couple of runs just to be sure.  Pretty consistent, not seeing a differential now with my testing - entirely possible the variance I saw last night was CPU related as well (was running everything on the same host at that point):&lt;/p&gt;

&lt;p&gt;4 threads, journal disabled, journal compressor = snappy&lt;/p&gt;

&lt;p&gt;run 1: 318.321&lt;br/&gt;
run 2: 321.376&lt;/p&gt;

&lt;p&gt;4 threads, journal disabled, journal compressor = none&lt;/p&gt;

&lt;p&gt;run 1: 321.594&lt;br/&gt;
run 2: 317.720&lt;/p&gt;

&lt;p&gt;4 threads, journal disabled, journal compressor = zlib&lt;/p&gt;

&lt;p&gt;run 1: 320.312&lt;br/&gt;
run 2: 318.326           &lt;/p&gt;</comment>
                            <comment id="826811" author="adamc" created="Wed, 11 Feb 2015 15:58:26 +0000"  >&lt;p&gt;EDIT: removing previous udpate because I suspect something was stealing CPU cycles randomly on my client machine and creating variance.  I cleaned things up and got the following results:&lt;/p&gt;

&lt;p&gt;8 threads, journal: disabled, journalCompressor: none&lt;/p&gt;

&lt;p&gt;run 1: 259.824s&lt;br/&gt;
run 2: 259.023s&lt;br/&gt;
run 3: 257.046s&lt;br/&gt;
run 4: 258.878s&lt;br/&gt;
avg: 258.693s (316668.792 inserts/sec)&lt;/p&gt;


&lt;p&gt;8 threads, journal: disabled, journalCompressor: snappy&lt;/p&gt;

&lt;p&gt;run 1: 258.777s&lt;br/&gt;
run 2: 258.329s&lt;br/&gt;
run 3: 258.320s&lt;br/&gt;
run 4: 257.852s&lt;br/&gt;
avg: 258.32s (317126.659 inserts/sec)&lt;/p&gt;

&lt;p&gt;So, basically the same, at least for these tests where my client is the limiting factor (CPU bound).  My server is not even breathing hard (&amp;lt;50% CPU, &amp;lt;50% IO)&lt;/p&gt;</comment>
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