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<channel>
    <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-78480] Avoid unnecessary string copies in NumberParser</title>
                <link>https://jira.mongodb.org/browse/SERVER-78480</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;NumberParser is used in &lt;a href=&quot;https://github.com/10gen/mongo/blob/502ee4edd68cf833bd5b2b5f98c4538a6d9ce6eb/src/mongo/bson/bsonelement.cpp#L454&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BSONElement&lt;/a&gt;, the &lt;a href=&quot;https://github.com/10gen/mongo/blob/502ee4edd68cf833bd5b2b5f98c4538a6d9ce6eb/src/mongo/db/exec/sbe/vm/vm.cpp#L1214&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SBE VM&lt;/a&gt;, and many _gen files. This class uses a helper function parseNumberFromStringHelper, where I see two unnecessary string copies: &lt;a href=&quot;https://github.com/10gen/mongo/blob/502ee4edd68cf833bd5b2b5f98c4538a6d9ce6eb/src/mongo/base/parse_number.cpp#L231&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;#1&lt;/a&gt; and &lt;a href=&quot;https://github.com/10gen/mongo/blob/502ee4edd68cf833bd5b2b5f98c4538a6d9ce6eb/src/mongo/base/parse_number.cpp#L300&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;#2&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In an extreme case I came up with, parsing one million numbers from {$match: {a: 1, b: 1, c: 1, ...}} originally took 4 seconds, and with a few lines change to avoid a copy it took 2 seconds instead, and the patch was green.&lt;/p&gt;

&lt;p&gt;We should also look at the Decimal128 constructors, they appear to make &lt;a href=&quot;https://github.com/10gen/mongo/blob/502ee4edd68cf833bd5b2b5f98c4538a6d9ce6eb/src/mongo/platform/decimal128.cpp#L295-L298&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unnecessary copies&lt;/a&gt; as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2378456">SERVER-78480</key>
            <summary>Avoid unnecessary string copies in NumberParser</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="patrick.freed@mongodb.com">Patrick Freed</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                            <label>perf</label>
                            <label>techdebt</label>
                    </labels>
                <created>Tue, 27 Jun 2023 18:04:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:19:29 +0000</updated>
                            <resolved>Mon, 9 Oct 2023 22:15:41 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5760134" author="xgen-internal-githook" created="Fri, 6 Oct 2023 18:48:40 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Patrick Freed&apos;, &apos;email&apos;: &apos;patrick.freed@mongodb.com&apos;, &apos;username&apos;: &apos;patrickfreed&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78480&quot; title=&quot;Avoid unnecessary string copies in NumberParser&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78480&quot;&gt;&lt;del&gt;SERVER-78480&lt;/del&gt;&lt;/a&gt; Eliminate redundant copies in Decimal128 string parsing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e93490c661599645453e09d9bd9938df62cdb166&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e93490c661599645453e09d9bd9938df62cdb166&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5753110" author="patrick.freed" created="Wed, 4 Oct 2023 18:31:53 +0000"  >&lt;p&gt;The copies in the &lt;tt&gt;double&lt;/tt&gt; path are actually necessary, since the underlying conversion function being used (&lt;tt&gt;strtod&lt;/tt&gt;) requires a null-terminated string, which is not guaranteed for &lt;tt&gt;StringData::rawData&lt;/tt&gt;. The newer &lt;tt&gt;from_chars&lt;/tt&gt; doesn&apos;t have this requirement, but unfortunately it seems to be slower despite not having the copy.&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;------------------------------------------------------------------------------------------&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;Benchmark                                Time             CPU   Iterations UserCounters...&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;/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;BM_NumberParserDouble10k/1            65.8 ns         65.8 ns     10633441 bytes_per_second=86.936M/s&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;BM_NumberParserDouble10k/8             574 ns          574 ns      1219148 bytes_per_second=96.4312M/s&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;BM_NumberParserDouble10k/64           4800 ns         4800 ns       145662 bytes_per_second=94.3676M/s&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;BM_NumberParserDouble10k/512         39810 ns        39809 ns        17591 bytes_per_second=90.0043M/s&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;BM_NumberParserDouble10k/4096       324067 ns       324058 ns         2159 bytes_per_second=89.0407M/s&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;BM_NumberParserDouble10k/32768     2606815 ns      2606747 ns          269 bytes_per_second=88.6063M/s&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;BM_NumberParserDouble10k/100000    7948380 ns      7948237 ns           88 bytes_per_second=88.6538M/s&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;BM_from_charsDouble10k/1               120 ns          120 ns      5847886 bytes_per_second=47.8316M/s&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;BM_from_charsDouble10k/8              1000 ns         1000 ns       700490 bytes_per_second=55.3387M/s&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;BM_from_charsDouble10k/64             8286 ns         8286 ns        84387 bytes_per_second=54.67M/s&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;BM_from_charsDouble10k/4096         542507 ns       542457 ns         1290 bytes_per_second=53.192M/s&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;BM_from_charsDouble10k/32768       4346975 ns      4346905 ns          161 bytes_per_second=53.1353M/s&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;BM_strtodDouble10k/32768           2306171 ns      2306147 ns          304 bytes_per_second=100.156M/s&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 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;BM_strtodDouble10k/100000          7041471 ns      7041207 ns           99 bytes_per_second=100.074M/s&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;benchmark: &lt;a href=&quot;https://github.com/patrickfreed/mongo/blob/parse-number-bm-old/src/mongo/base/parse_number_bm.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/patrickfreed/mongo/blob/parse-number-bm-old/src/mongo/base/parse_number_bm.cpp&lt;/a&gt; (the 10k refers to the min/max number being parsed, the parameter is the number of random numbers parsed)&lt;/p&gt;

&lt;p&gt;The copies in the Decimal128 path were not necessary though, and removing them demonstrated some performance benefits, so I&apos;ve gone ahead with just that.&lt;/p&gt;</comment>
                            <comment id="5558490" author="kyle.suarez" created="Tue, 11 Jul 2023 19:24:17 +0000"  >&lt;p&gt;We &lt;em&gt;think&lt;/em&gt; that Service Arch owns this so punting this ticket over.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
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            <issuekey id="1961583">SERVER-62509</issuekey>
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