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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-7310] benchRun() doesn&apos;t generate random distribution within the specified range</title>
                <link>https://jira.mongodb.org/browse/SERVER-7310</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;rand() returns an integer between 0 and RAND_MAX, which is 32767 on posix systems.  Thus using #RAND_INT in benchRun() will not create an even distribute for a large range.  See bench.cpp L300:&lt;/p&gt;

&lt;p&gt;int x = min + ( rand() % ( max - min ) );&lt;/p&gt;</description>
                <environment></environment>
        <key id="52738">SERVER-7310</key>
            <summary>benchRun() doesn&apos;t generate random distribution within the specified range</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="benjamin.becker">Ben Becker</reporter>
                        <labels>
                            <label>benchRun</label>
                    </labels>
                <created>Wed, 10 Oct 2012 00:22:51 +0000</created>
                <updated>Mon, 11 Jul 2016 17:58:35 +0000</updated>
                            <resolved>Fri, 16 Nov 2012 20:42:57 +0000</resolved>
                                                    <fixVersion>2.3.1</fixVersion>
                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="191664" author="eliot" created="Fri, 16 Nov 2012 20:42:57 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/72e82c6c1ed149bdabc8de4207c69856f3f7e86e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/72e82c6c1ed149bdabc8de4207c69856f3f7e86e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="173260" author="tad" created="Wed, 10 Oct 2012 10:28:41 +0000"  >&lt;p&gt;I think we&apos;d be happier in the long run if we switch to using our own pseudo-random number generator and precisely define its semantics.  Ideally, we would be able to generate the same pseudo-random sequence on every platform every time by specifying the seed.  We may have uses for a &quot;global&quot; sequence shared by all threads or by a subset of threads, just as we may have uses for two threads each getting its own copy of a single &quot;fixed&quot; sequence.&lt;/p&gt;</comment>
                            <comment id="173180" author="schwerin" created="Wed, 10 Oct 2012 01:01:40 +0000"  >&lt;p&gt;rand() isn&apos;t really safe to use at all in benchrun, because the global random seed state is not accessed in a thread-safe manner.  Every thread should really have its own instance of a random number generator, and said generator should have well defined behavior, regarding uniformity of generated numbers, etc.&lt;/p&gt;</comment>
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