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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-4573] faults with every action</title>
                <link>https://jira.mongodb.org/browse/SERVER-4573</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running a lab environment with approx 40 million documents.  Watching mongostat, every action taken is incurring faults.  What would be your recommended technique to identify the causality.&lt;/p&gt;</description>
                <environment>RH Enterprise dual proc server</environment>
        <key id="27373">SERVER-4573</key>
            <summary>faults with every action</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="tad">Tad Marshall</assignee>
                                    <reporter username="brett.goldstein@cityofchicago.org">Brett Goldstein</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Dec 2011 21:15:54 +0000</created>
                <updated>Thu, 6 Apr 2023 17:32:42 +0000</updated>
                            <resolved>Wed, 8 Feb 2012 18:58:00 +0000</resolved>
                                    <version>2.0.2</version>
                                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="83785" author="tad" created="Tue, 31 Jan 2012 20:58:43 +0000"  >&lt;p&gt;From the numbers in your mongostat output, it seems that your mapped dataset size (9.95 GB) is a lot larger than the amount that actually fits in memory (between 1.88 GB and 2.74 GB), so page faults will happen for every document that falls outside the resident memory.  As expected, the fault rate is higher for inserts than for deletes (since a record to be deleted might be in memory, while an insert requires free space in a file region that probably won&apos;t be in memory if you are memory-constrained).  Since you probably have no control over the locality of the data being removed or inserted, your best bet would be to increase RAM.&lt;/p&gt;</comment>
                            <comment id="76486" author="eliot" created="Thu, 29 Dec 2011 06:47:01 +0000"  >&lt;p&gt;If the data set is a lot bigger than ram - than if operations are evenly distributed - most operations will produce a fault.&lt;/p&gt;</comment>
                            <comment id="76452" author="brett.goldstein@cityofchicago.org" created="Thu, 29 Dec 2011 00:48:12 +0000"  >&lt;p&gt;this is from an insert job:&lt;/p&gt;


&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;mongodb@my07apl01 ~&amp;#93;&lt;/span&gt;$ ./mongodb-linux-x86_64-2.0.2/bin/mongostat&lt;br/&gt;
connected to: 127.0.0.1&lt;br/&gt;
insert  query update delete getmore command flushes mapped  vsize    res faults locked % idx miss %     qr|qw   ar|aw  netIn netOut  conn       time&lt;br/&gt;
   228      0      0      0       0       1       0  9.95g  20.3g  2.52g    290     95.6        2.9       0|0     0|1    78k     1k     5   18:47:36&lt;br/&gt;
   245      0      0      0       0       1       0  9.95g  20.3g   2.5g    257     96.7        2.7       0|0     0|1    84k     1k     5   18:47:37&lt;br/&gt;
   175      0      0      0       0       1       0  9.95g  20.3g  2.54g    308     97.7        7.4       0|0     0|1    59k     1k     5   18:47:38&lt;br/&gt;
   157      0      0      0       0       1       0  9.95g  20.3g  2.57g    230     95.4        4.1       0|0     0|1    55k     1k     5   18:47:39&lt;br/&gt;
   210      0      0      0       0       1       0  9.95g  20.3g  2.55g    161     94.5        6.2       0|0     0|1    75k     1k     5   18:47:40&lt;br/&gt;
    45      0      0      0       0       1       0  9.95g  20.3g  2.56g     77     98.8          0       0|0     0|1    15k     1k     5   18:47:41&lt;br/&gt;
   107      0      0      0       0       1       1  9.95g  20.3g  2.56g    128     98.5          0       0|0     0|1    37k     1k     5   18:47:42&lt;br/&gt;
   235      0      0      0       0       1       0  9.95g  20.3g  2.61g    309     97.2        5.4       0|0     0|1    85k     1k     5   18:47:43&lt;br/&gt;
   244      0      0      0       0       1       0  9.95g  20.3g  2.62g    304     96.1        2.7       0|0     0|1    83k     1k     5   18:47:44&lt;br/&gt;
   207      0      0      0       0       1       0  9.95g  20.3g  2.65g    327     97.7        3.2       0|0     0|0    71k     1k     5   18:47:45&lt;br/&gt;
insert  query update delete getmore command flushes mapped  vsize    res faults locked % idx miss %     qr|qw   ar|aw  netIn netOut  conn       time&lt;br/&gt;
   216      0      0      0       0       1       0  9.95g  20.3g  2.63g    292     95.1          3       0|0     0|1    78k     1k     5   18:47:46&lt;br/&gt;
   282      0      0      0       0       1       0  9.95g  20.3g  2.68g    359     97.9        2.3       0|0     0|1    98k     1k     5   18:47:47&lt;br/&gt;
   294      0      0      0       0       1       0  9.95g  20.3g  2.69g    335     96.5        4.4       0|0     0|1   102k     1k     5   18:47:48&lt;br/&gt;
   305      0      0      0       0       1       0  9.95g  20.3g  2.73g    243     93.4        6.5       0|0     0|1   105k     1k     5   18:47:49&lt;br/&gt;
   353      0      0      0       0       1       0  9.95g  20.3g  2.76g    261     97.7        1.8       0|0     0|1   121k     1k     5   18:47:50&lt;br/&gt;
   247      0      0      0       0       1       0  9.95g  20.3g  2.73g    196     95.5        5.4       0|0     0|1    85k     1k     5   18:47:51&lt;br/&gt;
   378      0      0      0       0       1       0  9.95g  20.3g  2.74g    320     95.4          0       0|0     0|1   137k     1k     5   18:47:52&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;mongodb@my07apl01 ~&amp;#93;&lt;/span&gt;$&lt;/p&gt;</comment>
                            <comment id="76451" author="brett.goldstein@cityofchicago.org" created="Thu, 29 Dec 2011 00:45:53 +0000"  >&lt;p&gt;This is from a large remove:&lt;/p&gt;


&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;mongodb@my07apl01 ~&amp;#93;&lt;/span&gt;$ ./mongodb-linux-x86_64-2.0.2/bin/mongostat&lt;br/&gt;
connected to: 127.0.0.1&lt;br/&gt;
insert  query update delete getmore command flushes mapped  vsize    res faults                                                                              locked % idx miss %     qr|qw   ar|aw  netIn netOut  conn       time&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g      0                                                                                  84.5          0       0|0     0|1    62b     1k     4   18:32:17&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.88g     11                                                                                   136          0       0|0     0|1    62b     1k     4   18:32:18&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g      0     89.4          0       0|0     0|1    62b     1k     4   18:32:19&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g      0     85.6          0       0|0     0|1    62b     1k     4   18:32:20&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g      0     86.7          0       0|0     0|1    62b     1k     4   18:32:21&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g      0      130          0       0|0     0|1    62b     1k     4   18:32:22&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g      6     80.1          0       0|0     0|1    62b     1k     4   18:32:23&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g      0     80.6          0       0|0     0|1    62b     1k     4   18:32:24&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.91g      1     77.1          0       0|0     0|1    62b     1k     4   18:32:25&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g   1.9g     18      164          0       0|0     0|1    62b     1k     4   18:32:26&lt;br/&gt;
insert  query update delete getmore command flushes mapped  vsize    res faults locked % idx miss %     qr|qw   ar|aw  netIn netOut  conn       time&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.91g      1     86.6          0       0|0     0|1    62b     1k     4   18:32:27&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.93g      0     86.6          0       0|0     0|1    62b     1k     4   18:32:28&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.89g      0     88.7          0       0|0     0|1    62b     1k     4   18:32:29&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.92g      0     54.9          0       0|1     0|1    62b     1k     4   18:32:30&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.92g      0      175          0       0|0     0|1    62b     1k     4   18:32:31&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.92g      0     85.1          0       0|0     0|1    62b     1k     4   18:32:32&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.89g      1     83.5          0       0|0     0|1    62b     1k     4   18:32:33&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.92g      0     53.8          0       0|1     0|1    62b     1k     4   18:32:34&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.92g     11      156          0       0|0     0|1    62b     1k     4   18:32:35&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.91g      0     73.2          0       0|0     0|1    62b     1k     4   18:32:36&lt;br/&gt;
insert  query update delete getmore command flushes mapped  vsize    res faults locked % idx miss %     qr|qw   ar|aw  netIn netOut  conn       time&lt;br/&gt;
     0      0      0      0       0       1       0  9.95g  20.3g  1.92g      0     74.9          0       0|1     0|1    62b     1k     4   18:32:37&lt;/p&gt;</comment>
                            <comment id="76429" author="eliot" created="Wed, 28 Dec 2011 23:28:00 +0000"  >&lt;p&gt;Can you paste mongostat output?&lt;/p&gt;</comment>
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