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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16880] Timer overflows at approximately 9223 seconds</title>
                <link>https://jira.mongodb.org/browse/SERVER-16880</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The main culprit can be attributed to the multiplication of the time delta by a very big number &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r2.8.0-rc4/src/mongo/util/timer.h#L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="179041">SERVER-16880</key>
            <summary>Timer overflows at approximately 9223 seconds</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Jan 2015 21:15:24 +0000</created>
                <updated>Fri, 23 Jan 2015 23:35:22 +0000</updated>
                            <resolved>Tue, 20 Jan 2015 22:37:54 +0000</resolved>
                                    <version>2.8.0-rc5</version>
                                    <fixVersion>3.0.0-rc6</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="808892" author="xgen-internal-githook" created="Tue, 20 Jan 2015 22:05:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16880&quot; title=&quot;Timer overflows at approximately 9223 seconds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16880&quot;&gt;&lt;del&gt;SERVER-16880&lt;/del&gt;&lt;/a&gt; Timer overflows at approximately 9223 seconds&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37398ff1063d8a42d075822ead009e761703fb9d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37398ff1063d8a42d075822ead009e761703fb9d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="806445" author="renctan" created="Fri, 16 Jan 2015 15:44:27 +0000"  >&lt;p&gt;We initially though of computing the greatest common denominator when we setup the clock settings so we can keep the computation in the integer space. We decided to use float instead because we can&apos;t say for certain that QueryPerformanceFrequency will always return a value for _countsPerSecond can effectively simplify the fraction of microsPerSecond/_countsPerSecond and the fact that integer division is relatively expensive.&lt;/p&gt;</comment>
                            <comment id="806076" author="schwerin" created="Fri, 16 Jan 2015 01:39:00 +0000"  >&lt;p&gt;Maybe.  Infuriatingly, the hardware instructions for integer multiply produce a 128-bit result and for divide consume a 128-bit quotient, but there&apos;s no way to put that to use.  That is, the hardware is already doing arithmetic with sufficient precision, if we could only explain to the compiler what we wanted.&lt;/p&gt;</comment>
                            <comment id="806074" author="kevin.pulo@10gen.com" created="Fri, 16 Jan 2015 01:36:44 +0000"  >&lt;p&gt;Right.  Like pre-computing _countsPerMicro, _countsPerMilli, and _countsPerMinute, and then just dividing the tick deltas by the right one (once)?  Even if clock ticks are at sub-nanosecond resolution, a long long should be plenty (eg. with a 10GHz clock _countsPerHour would be 36e12, which easily fits in a 64 bit int, and such a timer could still store up to 29 years).  Any casting to int should be done after the division, though.&lt;/p&gt;</comment>
                            <comment id="805855" author="schwerin" created="Thu, 15 Jan 2015 22:01:01 +0000"  >&lt;p&gt;I think we can avoid FP math here.&lt;/p&gt;</comment>
                            <comment id="805784" author="milkie" created="Thu, 15 Jan 2015 21:19:52 +0000"  >&lt;p&gt;Our idea to fix this is to use floating point division (carefully) here to scale the timer values to micros.&lt;/p&gt;</comment>
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            <issuekey id="178602">SERVER-16837</issuekey>
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