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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-62791] Improve performance of WiredTigerRecoveryUnit::setTimestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-62791</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The performance of &lt;tt&gt;setTimestamp&lt;/tt&gt; can be improved by using a stack buffer and simple formatting (like &lt;tt&gt;snprintf&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;Rationale: &lt;tt&gt;setTimestamp&lt;/tt&gt; sometimes pops up in performance critical paths (see HELP-28951).&#160; In&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-8365&quot; title=&quot;Improve performance for timestamp_transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8365&quot;&gt;&lt;del&gt;WT-8365&lt;/del&gt;&lt;/a&gt;, we improved the performance of the WT API used, and observed that simple changes on the caller side would improve performance more.  See &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8365&quot; title=&quot;Improve performance for timestamp_transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8365&quot;&gt;&lt;del&gt;WT-8365&lt;/del&gt;&lt;/a&gt; for discussion and benchmarks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1967469">SERVER-62791</key>
            <summary>Improve performance of WiredTigerRecoveryUnit::setTimestamp</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="13201">Fixed</resolution>
                                        <assignee username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="donald.anderson@mongodb.com">Donald Anderson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Jan 2022 15:18:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:54 +0000</updated>
                            <resolved>Mon, 7 Feb 2022 11:14:01 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="4338760" author="xgen-internal-githook" created="Mon, 7 Feb 2022 11:10:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62791&quot; title=&quot;Improve performance of WiredTigerRecoveryUnit::setTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62791&quot;&gt;&lt;del&gt;SERVER-62791&lt;/del&gt;&lt;/a&gt; Modify setTimestamp to use stack allocation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c0aa22815e8540d1efc57425696778ba90df8160&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c0aa22815e8540d1efc57425696778ba90df8160&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4336574" author="xgen-internal-githook" created="Fri, 4 Feb 2022 17:47:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62791&quot; title=&quot;Improve performance of WiredTigerRecoveryUnit::setTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62791&quot;&gt;&lt;del&gt;SERVER-62791&lt;/del&gt;&lt;/a&gt; Modify setTimestamp to use stack allocation&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 3f0788882675f8e4893a9c5ebbcee4716ed436fa.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bdb266d2b2149d0ccf0a89d7856f8e46205fdb07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bdb266d2b2149d0ccf0a89d7856f8e46205fdb07&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4335956" author="xgen-internal-githook" created="Fri, 4 Feb 2022 15:05:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62791&quot; title=&quot;Improve performance of WiredTigerRecoveryUnit::setTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62791&quot;&gt;&lt;del&gt;SERVER-62791&lt;/del&gt;&lt;/a&gt; Modify setTimestamp to use stack allocation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f0788882675f8e4893a9c5ebbcee4716ed436fa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f0788882675f8e4893a9c5ebbcee4716ed436fa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4303019" author="donald.anderson" created="Thu, 20 Jan 2022 15:36:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt;, sure, as long as it doesn&apos;t imply memory allocation.&#160; Whatever &lt;tt&gt;unsignedHex&lt;/tt&gt; calls is doing a &lt;tt&gt;new,&lt;/tt&gt;&#160;which implies tcmalloc memory allocation, so it&apos;s running slow.&lt;/p&gt;</comment>
                            <comment id="4303005" author="donald.anderson" created="Thu, 20 Jan 2022 15:30:49 +0000"  >&lt;p&gt;Here&apos;s what I was thinking (untested code):&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;diff --git a/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp b/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;--- a/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@@ -&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;847&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;,&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;8&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; +&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;847&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;,&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;9&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; @@ Status WiredTigerRecoveryUnit::setTimestamp(Timestamp timestamp) {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-&#160; &#160; &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; std::string conf = &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;commit_timestamp=&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; + unsignedHex(timestamp.asULL());&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
                            <comment id="4303001" author="louis.williams" created="Thu, 20 Jan 2022 15:30:01 +0000"  >&lt;p&gt;We made some changes in the past (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41344&quot; title=&quot;Format WiredTiger timestamps using fmt/format.h&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41344&quot;&gt;&lt;del&gt;SERVER-41344&lt;/del&gt;&lt;/a&gt;) to replace sprintf with fmt/format.h and saw performance improvements, so we should consider using that library instead.&lt;/p&gt;</comment>
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