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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-16064] WT Performance Regression for update of hot document on 2014-11-10 builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-16064</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongo-sim based microbenchmarks that update a hot document (i.e., all updating same document) show significant performance degradation today. 10 threads trying to update the same document. &lt;/p&gt;

&lt;p&gt;Throughput for the two tests&lt;br/&gt;
12: 2489	        2458	2386	419	       375&lt;br/&gt;
15: 45328	43026	43455	13261	5895&lt;br/&gt;
12 is a table scan based, and 15 is index scan based.  Last two numbers are for builds from today(4ab029e3 and c686f5a19 respectively). First three from last week. &lt;/p&gt;</description>
                <environment></environment>
        <key id="168397">SERVER-16064</key>
            <summary>WT Performance Regression for update of hot document on 2014-11-10 builds</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="david.daly@mongodb.com">David Daly</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Mon, 10 Nov 2014 23:55:19 +0000</created>
                <updated>Mon, 23 Mar 2015 17:49:01 +0000</updated>
                            <resolved>Thu, 13 Nov 2014 21:47:07 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="763867" author="david.daly" created="Thu, 13 Nov 2014 21:47:07 +0000"  >&lt;p&gt;Closing this one since the performance regression was relative to a incorrect behavior. &lt;/p&gt;</comment>
                            <comment id="763477" author="david.daly" created="Thu, 13 Nov 2014 16:30:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt;, it looks like you are right. I tried out before and after the changset for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15998&quot; title=&quot;Don&amp;#39;t fall-through on WriteConflictExceptions in write command update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15998&quot;&gt;&lt;del&gt;SERVER-15998&lt;/del&gt;&lt;/a&gt; on my laptop and that accounts for most of the performance hit. I&apos;m going to rerun on the original linux box to confirm.&lt;/p&gt;</comment>
                            <comment id="761784" author="asya" created="Tue, 11 Nov 2014 23:26:02 +0000"  >&lt;p&gt;Couldn&apos;t this be due to incorrect behavior on conflict on write fixed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15998&quot; title=&quot;Don&amp;#39;t fall-through on WriteConflictExceptions in write command update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15998&quot;&gt;&lt;del&gt;SERVER-15998&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
                            <comment id="761124" author="david.daly" created="Tue, 11 Nov 2014 14:32:02 +0000"  >&lt;p&gt;Updated results show a big improvement with version 92d967 for some of the mongo-perf simple_mms_update particularly single threaded, but still trailing at 10 threads. &lt;/p&gt;

&lt;p&gt;Update.MmsIncDeepDistinctPath2 and Update.MmsIncDeepDistinctPath3 show the biggest remaining mulithreaded drop. &lt;/p&gt;

&lt;p&gt;MongoDB shell version: 2.7.9-pre-&lt;br/&gt;
connecting to: 127.0.0.1:27017/test&lt;br/&gt;
db version: 2.7.9-pre-&lt;br/&gt;
92d967e8cd4d32f3b3348c89320f238df47a1454&lt;/p&gt;

&lt;p&gt;load(&apos;util/utils.js&apos;)&lt;/p&gt;

&lt;p&gt;load(&apos;testcases/simple_update_mms.js&apos;)&lt;/p&gt;

&lt;p&gt;mongoPerfRunTests(&lt;span class=&quot;error&quot;&gt;&amp;#91;1, 2, 10&amp;#93;&lt;/span&gt;, 1, 1, 5, 1, &apos;&apos;, &apos;sanity&apos;, &apos;localhost&apos;, &apos;27017&apos;, &apos;2014-11-11 09:13:04.439825&apos;, 0, &lt;/p&gt;
{&quot;writeCmdMode&quot;: &quot;true&quot;, &quot;writeConcernW&quot;: 0, &quot;safeGLE&quot;: &quot;false&quot;, &quot;writeConcernJ&quot;: &quot;false&quot;}
&lt;p&gt;, {&quot;server_git_hash&quot;: &quot;92d967e8cd4d32f3b3348c89320f238df47a1454&quot;, &quot;server_storage_engine&quot;: &quot;mmapv1&quot;, &quot;harness&quot;: {&quot;git_hash&quot;: &quot;unknown&quot;, &quot;client&quot;: &lt;/p&gt;
{&quot;git_hash&quot;: &quot;92d967e8cd4d32f3b3348c89320f238df47a1454&quot;, &quot;version&quot;: &quot;2.7.9-pre-&quot;, &quot;name&quot;: &quot;mongo shell&quot;}
&lt;p&gt;, &quot;name&quot;: &quot;mongo-perf&quot;, &quot;version&quot;: &quot;unknown&quot;}, &quot;server_version&quot;: &quot;2.7.9-pre-&quot;});&lt;/p&gt;

&lt;p&gt;Update.MmsIncShallow1&lt;br/&gt;
1	13519.945729823476&lt;br/&gt;
2	26124.8870798104&lt;br/&gt;
10	30881.237761253247&lt;br/&gt;
Update.MmsIncShallow2&lt;br/&gt;
1	13085.210060740188&lt;br/&gt;
2	25277.958548107814&lt;br/&gt;
10	30171.964700351145&lt;br/&gt;
Update.MmsIncDeep1&lt;br/&gt;
1	12550.573280508463&lt;br/&gt;
2	23841.99414059805&lt;br/&gt;
10	27023.686821843086&lt;br/&gt;
Update.MmsIncDeepSharedPath2&lt;br/&gt;
1	11983.706271301622&lt;br/&gt;
2	23534.86881768717&lt;br/&gt;
10	25074.967448476244&lt;br/&gt;
Update.MmsIncDeepSharedPath3&lt;br/&gt;
1	11560.046262584365&lt;br/&gt;
2	22816.050852284545&lt;br/&gt;
10	23646.00504220401&lt;br/&gt;
Update.MmsIncDeepDistinctPath2&lt;br/&gt;
1	11768.289256246278&lt;br/&gt;
2	21762.06858346463&lt;br/&gt;
10	22827.32463755248&lt;br/&gt;
Update.MmsIncDeepDistinctPath3&lt;br/&gt;
1	11105.09582864938&lt;br/&gt;
2	21316.883374014917&lt;br/&gt;
10	21449.972893572627&lt;br/&gt;
Finished Testing.&lt;/p&gt;</comment>
                            <comment id="760876" author="chung-yen.chang" created="Tue, 11 Nov 2014 02:15:31 +0000"  >&lt;p&gt;I reviewed the mongo-perf data from the last couple weeks and the interesting about the MMS related tests that David reported above is that the performance of those operations saw a big bump from Nov. 02 to Nov. 03. The between Nov. 06 and Nov. 07, we had this drop and the performance for those are basically back to the same level as before the big jump on the 3rd. Could this be something checked in around the 3rd got reverted?&lt;/p&gt;</comment>
                            <comment id="760862" author="david.daly" created="Tue, 11 Nov 2014 01:41:36 +0000"  >&lt;p&gt;Can be reproduced with mongo-perf simple_update_mms.js tests. &lt;/p&gt;

&lt;p&gt;Results from Friday build:&lt;br/&gt;
MongoDB shell version: 2.7.9-pre-&lt;br/&gt;
connecting to: 127.0.0.1:27017/test&lt;br/&gt;
db version: 2.7.9-pre-&lt;br/&gt;
e1fa60e4d8b3f525575b4602b208f2a1ef353735&lt;/p&gt;

&lt;p&gt;load(&apos;util/utils.js&apos;)&lt;/p&gt;

&lt;p&gt;load(&apos;testcases/simple_update_mms.js&apos;)&lt;/p&gt;

&lt;p&gt;mongoPerfRunTests(&lt;span class=&quot;error&quot;&gt;&amp;#91;1, 2, 10&amp;#93;&lt;/span&gt;, 1, 1, 5, 1, &apos;&apos;, &apos;sanity&apos;, &apos;localhost&apos;, &apos;27017&apos;, &apos;2014-11-10 20:26:34.117036&apos;, 0, &lt;/p&gt;
{&quot;writeCmdMode&quot;: &quot;true&quot;, &quot;writeConcernW&quot;: 0, &quot;safeGLE&quot;: &quot;false&quot;, &quot;writeConcernJ&quot;: &quot;false&quot;}
&lt;p&gt;, {&quot;server_git_hash&quot;: &quot;e1fa60e4d8b3f525575b4602b208f2a1ef353735&quot;, &quot;server_storage_engine&quot;: &quot;wiredtiger&quot;, &quot;harness&quot;: {&quot;git_hash&quot;: &quot;unknown&quot;, &quot;client&quot;: &lt;/p&gt;
{&quot;git_hash&quot;: &quot;e1fa60e4d8b3f525575b4602b208f2a1ef353735&quot;, &quot;version&quot;: &quot;2.7.9-pre-&quot;, &quot;name&quot;: &quot;mongo shell&quot;}
&lt;p&gt;, &quot;name&quot;: &quot;mongo-perf&quot;, &quot;version&quot;: &quot;unknown&quot;}, &quot;server_version&quot;: &quot;2.7.9-pre-&quot;});&lt;/p&gt;

&lt;p&gt;Update.MmsIncShallow1&lt;br/&gt;
1	5387.869405686705&lt;br/&gt;
2	10346.68059663405&lt;br/&gt;
10	36773.01260564449&lt;br/&gt;
Update.MmsIncShallow2&lt;br/&gt;
1	2704.0739901520587&lt;br/&gt;
2	11070.846304455816&lt;br/&gt;
10	35303.44937804129&lt;br/&gt;
Update.MmsIncDeep1&lt;br/&gt;
1	4145.163948786982&lt;br/&gt;
2	12022.550782257757&lt;br/&gt;
10	31695.022255211286&lt;br/&gt;
Update.MmsIncDeepSharedPath2&lt;br/&gt;
1	5400.731888185331&lt;br/&gt;
2	8730.902338566702&lt;br/&gt;
10	33936.71194292096&lt;br/&gt;
Update.MmsIncDeepSharedPath3&lt;br/&gt;
1	3465.989267852515&lt;br/&gt;
2	10754.621543982212&lt;br/&gt;
10	19927.94831974583&lt;br/&gt;
Update.MmsIncDeepDistinctPath2&lt;br/&gt;
1	4602.126997739766&lt;br/&gt;
2	7208.705300085804&lt;br/&gt;
10	35623.83609683674&lt;br/&gt;
Update.MmsIncDeepDistinctPath3&lt;br/&gt;
1	2699.4688058160373&lt;br/&gt;
2	11984.627830914062&lt;br/&gt;
10	34101.45363440599&lt;br/&gt;
Finished Testing.&lt;/p&gt;

&lt;p&gt;Today&apos;s builds:&lt;br/&gt;
MongoDB shell version: 2.7.9-pre-&lt;br/&gt;
connecting to: 127.0.0.1:27017/test&lt;br/&gt;
db version: 2.7.9-pre-&lt;br/&gt;
4ab029e3e68ea5f7aa89b90a47fd814d17b142bf&lt;/p&gt;

&lt;p&gt;load(&apos;util/utils.js&apos;)&lt;/p&gt;

&lt;p&gt;load(&apos;testcases/simple_update_mms.js&apos;)&lt;/p&gt;

&lt;p&gt;mongoPerfRunTests(&lt;span class=&quot;error&quot;&gt;&amp;#91;1, 2, 10&amp;#93;&lt;/span&gt;, 1, 1, 5, 1, &apos;&apos;, &apos;sanity&apos;, &apos;localhost&apos;, &apos;27017&apos;, &apos;2014-11-10 20:30:12.102994&apos;, 0, &lt;/p&gt;
{&quot;writeCmdMode&quot;: &quot;true&quot;, &quot;writeConcernW&quot;: 0, &quot;safeGLE&quot;: &quot;false&quot;, &quot;writeConcernJ&quot;: &quot;false&quot;}
&lt;p&gt;, {&quot;server_git_hash&quot;: &quot;4ab029e3e68ea5f7aa89b90a47fd814d17b142bf&quot;, &quot;server_storage_engine&quot;: &quot;wiredtiger&quot;, &quot;harness&quot;: {&quot;git_hash&quot;: &quot;unknown&quot;, &quot;client&quot;: &lt;/p&gt;
{&quot;git_hash&quot;: &quot;4ab029e3e68ea5f7aa89b90a47fd814d17b142bf&quot;, &quot;version&quot;: &quot;2.7.9-pre-&quot;, &quot;name&quot;: &quot;mongo shell&quot;}
&lt;p&gt;, &quot;name&quot;: &quot;mongo-perf&quot;, &quot;version&quot;: &quot;unknown&quot;}, &quot;server_version&quot;: &quot;2.7.9-pre-&quot;});&lt;/p&gt;

&lt;p&gt;Update.MmsIncShallow1&lt;br/&gt;
1	6737.886014511724&lt;br/&gt;
2	6622.532449209087&lt;br/&gt;
10	3845.7036893445347&lt;br/&gt;
Update.MmsIncShallow2&lt;br/&gt;
1	6185.674633514277&lt;br/&gt;
2	5531.5420607442375&lt;br/&gt;
10	3545.3450282721888&lt;br/&gt;
Update.MmsIncDeep1&lt;br/&gt;
1	4494.897529236861&lt;br/&gt;
2	5788.798466177198&lt;br/&gt;
10	6023.415849800333&lt;br/&gt;
Update.MmsIncDeepSharedPath2&lt;br/&gt;
1	1714.1266353800058&lt;br/&gt;
2	5876.233323040642&lt;br/&gt;
10	4449.179821800881&lt;br/&gt;
Update.MmsIncDeepSharedPath3&lt;br/&gt;
1	4524.605441965996&lt;br/&gt;
2	4377.35683684745&lt;br/&gt;
10	6266.528814789831&lt;br/&gt;
Update.MmsIncDeepDistinctPath2&lt;br/&gt;
1	5030.415749300684&lt;br/&gt;
2	7240.523792040764&lt;br/&gt;
10	3401.797353402449&lt;br/&gt;
Update.MmsIncDeepDistinctPath3&lt;br/&gt;
1	2694.7806223755783&lt;br/&gt;
2	6330.950570454653&lt;br/&gt;
10	4082.4566386183733&lt;br/&gt;
Finished Testing.&lt;/p&gt;

&lt;p&gt;MongoDB shell version: 2.7.9-pre-&lt;br/&gt;
connecting to: 127.0.0.1:27017/test&lt;br/&gt;
db version: 2.7.9-pre-&lt;br/&gt;
c686f5a1949339ba9390e6efc01ef8421867c692&lt;/p&gt;

&lt;p&gt;load(&apos;util/utils.js&apos;)&lt;/p&gt;

&lt;p&gt;load(&apos;testcases/simple_update_mms.js&apos;)&lt;/p&gt;

&lt;p&gt;mongoPerfRunTests(&lt;span class=&quot;error&quot;&gt;&amp;#91;1, 2, 10&amp;#93;&lt;/span&gt;, 1, 1, 5, 1, &apos;&apos;, &apos;sanity&apos;, &apos;localhost&apos;, &apos;27017&apos;, &apos;2014-11-10 20:35:48.689789&apos;, 0, &lt;/p&gt;
{&quot;writeCmdMode&quot;: &quot;true&quot;, &quot;writeConcernW&quot;: 0, &quot;safeGLE&quot;: &quot;false&quot;, &quot;writeConcernJ&quot;: &quot;false&quot;}
&lt;p&gt;, {&quot;server_git_hash&quot;: &quot;c686f5a1949339ba9390e6efc01ef8421867c692&quot;, &quot;server_storage_engine&quot;: &quot;wiredtiger&quot;, &quot;harness&quot;: {&quot;git_hash&quot;: &quot;unknown&quot;, &quot;client&quot;: &lt;/p&gt;
{&quot;git_hash&quot;: &quot;c686f5a1949339ba9390e6efc01ef8421867c692&quot;, &quot;version&quot;: &quot;2.7.9-pre-&quot;, &quot;name&quot;: &quot;mongo shell&quot;}
&lt;p&gt;, &quot;name&quot;: &quot;mongo-perf&quot;, &quot;version&quot;: &quot;unknown&quot;}, &quot;server_version&quot;: &quot;2.7.9-pre-&quot;});&lt;/p&gt;

&lt;p&gt;Update.MmsIncShallow1&lt;br/&gt;
1	7302.995414054061&lt;br/&gt;
2	5745.3124809960045&lt;br/&gt;
10	4858.553712321445&lt;br/&gt;
Update.MmsIncShallow2&lt;br/&gt;
1	5636.545757234148&lt;br/&gt;
2	1672.2907342530657&lt;br/&gt;
10	6150.579877796645&lt;br/&gt;
Update.MmsIncDeep1&lt;br/&gt;
1	1830.9661278211604&lt;br/&gt;
2	6794.260091789858&lt;br/&gt;
10	5677.685865923321&lt;br/&gt;
Update.MmsIncDeepSharedPath2&lt;br/&gt;
1	4837.431125896663&lt;br/&gt;
2	6657.849480180749&lt;br/&gt;
10	3748.3712412403197&lt;br/&gt;
Update.MmsIncDeepSharedPath3&lt;br/&gt;
1	6028.324246459469&lt;br/&gt;
2	2694.6507163503143&lt;br/&gt;
10	5943.981827708826&lt;br/&gt;
Update.MmsIncDeepDistinctPath2&lt;br/&gt;
1	5648.794416560891&lt;br/&gt;
2	3732.0550127295746&lt;br/&gt;
10	5721.351233289057&lt;br/&gt;
Update.MmsIncDeepDistinctPath3&lt;br/&gt;
1	6010.587507593661&lt;br/&gt;
2	3522.005765209036&lt;br/&gt;
10	5613.250286825488&lt;br/&gt;
Finished Testing.&lt;/p&gt;</comment>
                            <comment id="760802" author="david.daly" created="Mon, 10 Nov 2014 23:59:21 +0000"  >&lt;p&gt;May be related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16056&quot; title=&quot;Periodic throughput pauses during write load on WT&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16056&quot;&gt;&lt;del&gt;SERVER-16056&lt;/del&gt;&lt;/a&gt; ?&lt;/p&gt;</comment>
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