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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-69381] Improve unique_function performance w/small object buffer</title>
                <link>https://jira.mongodb.org/browse/SERVER-69381</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Our unique_function class template always allocates. Its &apos;Impl` is held by unique_ptr. We could probably benefit from a union of inline storage if the callable is small enough to fit within an aligned buffer of a few pointers&apos; size.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://llvm.org/doxygen/FunctionExtras_8h_source.html#l00081&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://llvm.org/doxygen/FunctionExtras_8h_source.html#l00081&lt;/a&gt;&lt;br/&gt;
If the callable size is less than 3 pointers, then there&apos;s no allocation. It&apos;s just moved into the unique_function object.&lt;br/&gt;
I think this optimization could be a win in async and Future dispatch costs if we bind a reasonable amount of stuff to the relevant lambdas.&lt;br/&gt;
Abseil is calling this absl::AnyInvocable but they use a max inline storage of 2 pointers instead of 3. &lt;a href=&quot;https://github.com/abseil/abseil-cpp/blob/master/absl/functional/internal/any_invocable.h#L93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/abseil/abseil-cpp/blob/master/absl/functional/internal/any_invocable.h#L93&lt;/a&gt;. Their naming is standards-influenced&lt;/p&gt;


&lt;p&gt;Or we could switch our home-grown `unique_function` out to use a vendored implementation instead (like one of those above).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2127770">SERVER-69381</key>
            <summary>Improve unique_function performance w/small object buffer</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Sep 2022 18:21:23 +0000</created>
                <updated>Mon, 5 Dec 2022 23:46:10 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4819981" author="jason.chan" created="Mon, 12 Sep 2022 18:05:44 +0000"  >&lt;p&gt;We are looking to prioritize this because we think this is a low-hanging fruit for optimizing performance across the codebase, and this can be helpful for when we do the performance benchmarking for our upcoming refactoring projects.&lt;/p&gt;</comment>
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