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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-68014] Eliminate the 70% performance regression when passing &quot;UTC&quot; to $dateTrunc</title>
                <link>https://jira.mongodb.org/browse/SERVER-68014</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Let us consider running the following query over the collection of 1100000 documents with just one field &quot;a&quot;, which has a date value:&lt;/p&gt;
&lt;p/&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: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;binSize&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; : &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;5&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;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;Note that since we did not pass the timezone parameter, $dateTrunc will default to UTC.&lt;/p&gt;

&lt;p&gt;This query runs at 1.53 sec / op. But if we pass timezone parameter as a string &quot;UTC&quot; (same semantics, just passing the default parameter explicitly), the query runs at 2.58 sec / op, which is&#160;&lt;b&gt;69% slower&lt;/b&gt;.&lt;/p&gt;

&lt;p&gt;A combination of the following behavior causes the regression:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/f4de1bd3b7de8b3e93d7d051cbfe8544df71112f/src/mongo/db/pipeline/expression.cpp#L1212-L1234&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Our code&lt;/a&gt; which parses the timezone has a special branch. If no timezone parameter is passed, mongo::TimeZoneDatabase::utcZone() is returned. If the timezone parameter is passed, we lookup the timezone in the timezone database&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Later on repeatedly during runtime, the following code path is exercised:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Timezones from the timezone database (including the UTC one) have TimeZone::isTimeZoneIDZone() set to true, which results in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a61ee18449ebfa2c152b4bd96ef4f25e1d7278eb/src/mongo/db/query/datetime/date_time_support.cpp#L392&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a call to timelib_set_timezone&lt;/a&gt; when TimeZone::adjustTimeZone() is called&lt;/li&gt;
	&lt;li&gt;&#160;timelib_set_timezone &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a61ee18449ebfa2c152b4bd96ef4f25e1d7278eb/src/third_party/timelib-2021.06/unixtime2tm.c#L209-L213&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sets&lt;/a&gt; the timelib_time::tz_abbr field to a small string representing the timezone and timelib_time::zone_type to TIMELIB_ZONETYPE_ID&lt;/li&gt;
	&lt;li&gt;There is a check for TIMELIB_ZONETYPE_ID in functions timelib_unixtime2local and timelib_update_from_sse, which are used quite often in our code&lt;/li&gt;
	&lt;li&gt;If TIMELIB_ZONETYPE_ID is set, timelib_get_time_zone_info is called, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a61ee18449ebfa2c152b4bd96ef4f25e1d7278eb/src/third_party/timelib-2021.06/parse_tz.c#L908&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;copies the timelib_time::tz_abbr field&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;These small allocations quickly add up and kill the performance&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;If the timezone is constructed using mongo::TimeZoneDatabase::utcZone() (which is the case for the absent timezone parameter for $dateTrunc), TIMELIB_ZONETYPE_ID is not set and no additional allocations are performed.&#160;&lt;/p&gt;

&lt;p&gt;During our investigation, we have noticed as much as 2x performance regression because of these allocations when executing $dateTrunc in our time-series prototype for SBE.&lt;/p&gt;

&lt;p&gt;While the frequency of timezone parsing is reduced by the proposed change in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66521&quot; title=&quot;Optimize parseTimeUnit() for date expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66521&quot;&gt;&lt;del&gt;SERVER-66521&lt;/del&gt;&lt;/a&gt; across repeated calls to date time expression with the same timezone specification; however, if ID style timezone is used, the regression seen with &quot;UTC&quot; timezone from the runtime path 1-5 is still present. This ticket will attempt to address the latter.&#160;&lt;/p&gt;

&lt;p&gt;There might be possibilities to also optimize for timezones other than UTC but attention must be paid with regard to DST. UTC has no DST concept (permanent offset == 0) so it does not need to be looked up again when the time value passed into the expression changes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2089496">SERVER-68014</key>
            <summary>Eliminate the 70% performance regression when passing &quot;UTC&quot; to $dateTrunc</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="alberto.massari@mongodb.com">Alberto Massari</assignee>
                                    <reporter username="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Jul 2022 15:46:02 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:41 +0000</updated>
                            <resolved>Tue, 2 Aug 2022 13:30:01 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4720877" author="xgen-internal-githook" created="Tue, 2 Aug 2022 13:15:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alberto Massari&apos;, &apos;email&apos;: &apos;alberto.massari@mongodb.com&apos;, &apos;username&apos;: &apos;albymassari&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68014&quot; title=&quot;Eliminate the 70% performance regression when passing &amp;quot;UTC&amp;quot; to $dateTrunc&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68014&quot;&gt;&lt;del&gt;SERVER-68014&lt;/del&gt;&lt;/a&gt; treat &apos;UTC&apos; timezone the same as the default timezone&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/09e278d706b4062b53d5b614cfd6b63ec62661ee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/09e278d706b4062b53d5b614cfd6b63ec62661ee&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4689350" author="JIRAUSER1257467" created="Tue, 19 Jul 2022 15:21:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rushan.chen%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;rushan.chen@mongodb.com&quot;&gt;rushan.chen@mongodb.com&lt;/a&gt; assigning you to find an assignee&lt;/p&gt;</comment>
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