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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-463] map/reduce should use all CPU cores</title>
                <link>https://jira.mongodb.org/browse/SERVER-463</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;instead of just 1&lt;/p&gt;

&lt;p&gt;at least as an option&lt;/p&gt;</description>
                <environment></environment>
        <key id="10957">SERVER-463</key>
            <summary>map/reduce should use all CPU cores</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                            <label>map-reduce</label>
                    </labels>
                <created>Tue, 8 Dec 2009 20:36:50 +0000</created>
                <updated>Tue, 6 Dec 2022 05:51:10 +0000</updated>
                            <resolved>Fri, 4 Feb 2022 15:09:42 +0000</resolved>
                                                                    <component>MapReduce</component>
                                        <votes>157</votes>
                                    <watches>97</watches>
                                                                                                                <comments>
                            <comment id="4335987" author="esha.bhargava" created="Fri, 4 Feb 2022 15:08:19 +0000"  >&lt;p&gt;Closing these tickets as part of the deprecation of mapReduce.&lt;/p&gt;</comment>
                            <comment id="275893" author="benjamin.becker" created="Tue, 26 Feb 2013 04:59:33 +0000"  >&lt;p&gt;Hi Antoine,&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to allow a single MapReduce job to use multiple cores, which is not &lt;em&gt;yet&lt;/em&gt; implemented.  This requires several new features; e.g. a storage system for intermediate results that doesn&apos;t acquire a db-level write lock, and global CPU/memory resource management.&lt;/p&gt;</comment>
                            <comment id="275892" author="chengas123" created="Tue, 26 Feb 2013 04:59:08 +0000"  >&lt;p&gt;I think there is agreement that M/R should use multiple cores. It&apos;s just a question of fixing it to do that now that we have v8.&lt;/p&gt;</comment>
                            <comment id="275882" author="antoineguiral" created="Tue, 26 Feb 2013 04:40:58 +0000"  >&lt;p&gt;Hum, so instead of 1 M/R at a time we could do &quot;numCPU&quot; M/R? I would prefer that my M/R become faster. Why they will still use only one CPU? When you perform a big M/R there is in fact a lot of M/R, they should be parallelized no? Or maybe I miss something..&lt;/p&gt;</comment>
                            <comment id="267189" author="benjamin.becker" created="Fri, 15 Feb 2013 16:11:48 +0000"  >&lt;p&gt;To clarify a bit further, v2.4 will allow multiple MapReduce commands to execute JavaScript concurrently.  A single MapReduce command will only use one core.&lt;/p&gt;</comment>
                            <comment id="267143" author="tad" created="Fri, 15 Feb 2013 15:09:56 +0000"  >&lt;p&gt;The move to V8 does enable additional multi-threading options, but MapReduce itself needs some restructuring to take advantage of this properly.  This won&apos;t be fully realized for 2.4, but it should probably be placed on the schedule and not left as &quot;planned but not scheduled&quot;.&lt;/p&gt;</comment>
                            <comment id="266865" author="chengas123" created="Fri, 15 Feb 2013 06:33:55 +0000"  >&lt;p&gt;I&apos;m surprised this is listed as &quot;planned but not scheduled&quot;. Won&apos;t this be fixed as part of moving to v8 in 2.4?&lt;/p&gt;</comment>
                            <comment id="25749" author="plasma" created="Fri, 11 Mar 2011 05:45:36 +0000"  >&lt;p&gt;Would be good to have I think for sharded setups; given I think group() does not work when sharded for example either?&lt;/p&gt;</comment>
                            <comment id="16246" author="russell.smith@ukd1.co.uk" created="Wed, 28 Jul 2010 09:48:08 +0000"  >&lt;p&gt;This is important to me, as it will significantly improve performance on my machine (I&apos;m cpu bound on a single core, on a 8 core server).&lt;/p&gt;</comment>
                            <comment id="16108" author="penfold" created="Sat, 24 Jul 2010 14:06:13 +0000"  >&lt;p&gt;Is it possible to schedule this improvement for an upcoming release?&lt;/p&gt;

&lt;p&gt;This should give me a serious performance boost. Especially in a sharded setup.&lt;/p&gt;</comment>
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