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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-67028] Fix 12% perf loss in validateBSON due to BSONElement changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-67028</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The fix for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27209&quot; title=&quot;BSONObj::getStringField() does not handle embedded null bytes correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27209&quot;&gt;&lt;del&gt;SERVER-27209&lt;/del&gt;&lt;/a&gt;  removed a &lt;tt&gt;BSONElement&lt;/tt&gt; constructor taking &lt;tt&gt;CachedSizeTag&lt;/tt&gt;. However, while the constructor that we&apos;re using in its place allows specifying both the name length and the value length, it also allows replacing either argument by -1. This is suboptimal, as it requires checks for this magic value in the very hot path of constructing &lt;tt&gt;BSONElement&lt;/tt&gt; values.&lt;/p&gt;

&lt;p&gt;The effect is a 12% drop in performance of &lt;tt&gt;validateBSON&lt;/tt&gt;, as shown in the &lt;tt&gt;bson_bm&lt;/tt&gt; benchmark regressing from 4.25GB/sec to 3.75 GB/sec. We should fix this either by reinstating the &lt;tt&gt;CachedSizeTag&lt;/tt&gt; constructor, or (preferably, IMO) removing the special -1 uses for construction of elements. If we&apos;d want these, using a special constructor for each of those would be reasonable. Call sites should always know whether they&apos;re defaulting either argument, so there really is no justification for much more fragile and slow run-time checks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2062243">SERVER-67028</key>
            <summary>Fix 12% perf loss in validateBSON due to BSONElement changes</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="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="13202">Works as Designed</resolution>
                                        <assignee username="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Sun, 5 Jun 2022 16:08:14 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:00 +0000</updated>
                            <resolved>Thu, 9 Jun 2022 19:20:27 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4605575" author="geert.bosch" created="Thu, 9 Jun 2022 19:18:35 +0000"  >&lt;p&gt;It turns out that the performance change was solely due to the compiler inlining things differently. So, not something we need to worry about right now.&lt;/p&gt;</comment>
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