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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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<item>
            <title>[SERVER-2636] mongoimport has unstable performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-2636</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We setup 8 single servers to run the mongoimport test&lt;br/&gt;
import 50,000,000 documents each time.&lt;br/&gt;
these documents have been splitted to 32 parts and we run 4 mongoimport instances for each server.&lt;/p&gt;

&lt;p&gt;At the beginning, the import speed is quite fast ( about 400 seconds each time ) when the mongod do not allocate the whole 64 GB RAM&lt;br/&gt;
But when the mongod has allocated all the RAM , there always have one or two server became take 99%+ CPU and import too slow.&lt;br/&gt;
These slow servers seem to randomly so that we can not figure out the reason.&lt;/p&gt;

&lt;p&gt;And After 50 times import, we found some of these servers still seem to import very fast but others became too slow.&lt;br/&gt;
one import process will  take 5000 seconds averagely or even more than 10000 seconds sometimes.&lt;/p&gt;

&lt;p&gt;We had ran the same test for 1.6.5,1.7.5 and 1.8.0-rc0, and it&apos;s the same results.&lt;br/&gt;
We think the unstable performance is quite strange and maybe a problem of mongoimport or mongodb.&lt;/p&gt;

</description>
                <environment>OS: Linux rhel5 64bit. &lt;br/&gt;
Mem: 64GB RAM. &lt;br/&gt;
CPU:  Xeon  &lt;a href=&apos;mailto:E5620@2.40GHz&apos;&gt;E5620@2.40GHz&lt;/a&gt;</environment>
        <key id="14918">SERVER-2636</key>
            <summary>mongoimport has unstable performance</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="-1">Unassigned</assignee>
                                    <reporter username="tullyliu">Tao Liu</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Feb 2011 12:27:44 +0000</created>
                <updated>Wed, 15 Aug 2012 14:24:12 +0000</updated>
                            <resolved>Sat, 3 Mar 2012 13:34:51 +0000</resolved>
                                    <version>1.6.5</version>
                    <version>1.7.5</version>
                    <version>1.8.0-rc0</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="83909" author="eliot" created="Wed, 1 Feb 2012 04:21:29 +0000"  >&lt;p&gt;Sorry this got lost.&lt;br/&gt;
Have you tried with 2.0.2?&lt;/p&gt;</comment>
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