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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-17021] Significant WT Performance Regression on &quot;modified&quot; FSM workload</title>
                <link>https://jira.mongodb.org/browse/SERVER-17021</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A modified version of &lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;jstests/concurrency/fsm_workloads/findAndModify_update_grow.js&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt; (see attachments) seems to be stalling significantly on IO, specifically when waiting to read WT overflow items from disk.&lt;/p&gt;

&lt;p&gt;Here is an abridged version of a poor man&apos;s profiler output (see: &lt;a href=&quot;http://poormansprofiler.org/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://poormansprofiler.org/&lt;/a&gt;). Full profiler output is attached.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;(# times this stack occurred, thread stack)&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;41 pthread_cond_timedwait@@GLIBC_2.3.2,__wt_cond_wait,??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;39 __wt_readlock,__wt_ovfl_read,__wt_kv_return,__wt_btcur_search_near,??,mongo::WiredTigerRecordStore::Iterator::_locate(mongo::RecordId,mongo::WiredTigerRecordStore::Iterator::restoreState(mongo::OperationContext*),mongo::CollectionScan::restoreState(mongo::OperationContext*), [...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;35 __wt_readlock,__wt_ovfl_read,__wt_btcur_next,??,mongo::WiredTigerRecordStore::Iterator::_getNext(),mongo::WiredTigerRecordStore::Iterator::restoreState(mongo::OperationContext*),mongo::CollectionScan::restoreState(mongo::OperationContext*),[...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;30 __wt_readlock,__wt_ovfl_read,__wt_btcur_next,??,mongo::WiredTigerRecordStore::Iterator::_getNext(),mongo::WiredTigerRecordStore::Iterator::getNext(),mongo::CollectionScan::work(unsigned,mongo::SortStage::work(unsigned,mongo::PlanExecutor::getNext(mongo::BSONObj*,,mongo::CmdFindAndModify::runImpl(mongo::OperationContext*,,mongo::CmdFindAndModify::run(mongo::OperationContext*,[...]&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;27 __wt_readlock,__wt_ovfl_read,__wt_kv_return,__wt_btcur_search_near,??,mongo::WiredTigerRecordStore::Iterator::_locate(mongo::RecordId,mongo::WiredTigerRecordStore::Iterator::restoreState(mongo::OperationContext*),mongo::CollectionScan::restoreState(mongo::OperationContext*),[...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;23 __wt_readlock,__wt_ovfl_read,__wt_btcur_next,??,mongo::WiredTigerRecordStore::Iterator::_getNext(),mongo::WiredTigerRecordStore::Iterator::restoreState(mongo::OperationContext*),mongo::CollectionScan::restoreState(mongo::OperationContext*),[...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;22 __wt_readlock,__wt_ovfl_read,__wt_btcur_next,??,mongo::WiredTigerRecordStore::Iterator::_getNext(),mongo::WiredTigerRecordStore::Iterator::getNext(),[...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;10 select,mongo::Listener::initAndListen(),mongo::webServerThread(mongo::AdminAccess,??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;10 select,mongo::Listener::initAndListen(),mongo::initAndListen(int),main&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;10 sched_yield,__wt_page_in_func,__wt_row_search,__wt_btcur_search_near,??,mongo::WiredTigerRecordStore::Iterator::_locate(mongo::RecordId,mongo::WiredTigerRecordStore::Iterator::restoreState(mongo::OperationContext*),mongo::CollectionScan::restoreState(mongo::OperationContext*),[...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;10 recv,mongo::Socket::_recv(char*,,mongo::Socket::unsafe_recv(char*,,mongo::Socket::recv(char*,,mongo::MessagingPort::recv(mongo::Message&amp;amp;),mongo::PortMessageServer::handleIncomingMsg(void*),start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;10 pthread_cond_wait@@GLIBC_2.3.2,mongo::DeadlineMonitor&amp;lt;mongo::V8Scope&amp;gt;::deadlineMonitorThread(),??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;10 pthread_cond_timedwait@@GLIBC_2.3.2,mongo::RangeDeleter::doWork(),??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;10 pthread_cond_timedwait@@GLIBC_2.3.2,bool,??,mongo::BackgroundJob::jobBody(),??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;10 nanosleep,mongo::sleepsecs(int),mongo::TTLMonitor::run(),mongo::BackgroundJob::jobBody(),??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;10 nanosleep,mongo::sleepsecs(int),mongo::SnapshotThread::run(),mongo::BackgroundJob::jobBody(),??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;10 nanosleep,mongo::sleepsecs(int),mongo::ClientCursorMonitor::run(),mongo::BackgroundJob::jobBody(),??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;10 do_sigwait,sigwait,??,??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;6 sched_yield,__wt_page_in_func,__wt_tree_walk,__wt_btcur_next,??,mongo::WiredTigerRecordStore::Iterator::_getNext(),mongo::WiredTigerRecordStore::Iterator::restoreState(mongo::OperationContext*),mongo::CollectionScan::restoreState(mongo::OperationContext*),[...]&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;3 __wt_writelock,__wt_ovfl_discard,__wt_ovfl_track_wrapup,??,__wt_reconcile,__wt_cache_op,__wt_txn_checkpoint,??,??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&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;2 __wt_writelock,__wt_ovfl_track_wrapup,??,__wt_reconcile,__wt_cache_op,__wt_checkpoint,??,__wt_txn_checkpoint,??,??,start_thread,clone&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;2 sched_yield,__wt_page_in_func,__wt_tree_walk,__wt_btcur_next,??,mongo::WiredTigerRecordStore::Iterator::_getNext(),mongo::WiredTigerRecordStore::Iterator::restoreState(mongo::OperationContext*),mongo::CollectionScan::restoreState(mongo::OperationContext*),[...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   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;2 sched_yield,__wt_page_in_func,__wt_row_search,__wt_btcur_insert,??,mongo::WiredTigerRecordStore::insertRecord(mongo::OperationContext*,,mongo::Collection::_insertDocument(mongo::OperationContext*,,mongo::Collection::insertDocument(mongo::OperationContext*, [...]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="180372">SERVER-17021</key>
            <summary>Significant WT Performance Regression on &quot;modified&quot; FSM workload</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="keith.bostic@mongodb.com">Keith Bostic</assignee>
                                    <reporter username="daniel.alabi@10gen.com">Daniel Alabi</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Fri, 23 Jan 2015 14:54:12 +0000</created>
                <updated>Fri, 18 Sep 2015 22:38:25 +0000</updated>
                            <resolved>Wed, 28 Jan 2015 14:27:13 +0000</resolved>
                                    <version>2.8.0-rc5</version>
                                    <fixVersion>3.0.0-rc7</fixVersion>
                                    <component>Concurrency</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="814665" author="xgen-internal-githook" created="Tue, 27 Jan 2015 19:46:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;alabid&apos;, u&apos;name&apos;: u&apos;alabid&apos;, u&apos;email&apos;: u&apos;alabidan@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17021&quot; title=&quot;Significant WT Performance Regression on &amp;quot;modified&amp;quot; FSM workload&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17021&quot;&gt;&lt;del&gt;SERVER-17021&lt;/del&gt;&lt;/a&gt; Blacklist findAndModify_update_grow.js to prevent spurious MCI timeouts&lt;/p&gt;

&lt;p&gt;Closes #917&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
(cherry picked from commit 6fdd15e3e68c53d555ddd40402aefd156507b6a8)&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ef2ab17fb0c0ab8ed8c3ac6fb963fff80dc21978&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ef2ab17fb0c0ab8ed8c3ac6fb963fff80dc21978&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="814518" author="xgen-internal-githook" created="Tue, 27 Jan 2015 17:54:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;alabid&apos;, u&apos;name&apos;: u&apos;alabid&apos;, u&apos;email&apos;: u&apos;alabidan@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17021&quot; title=&quot;Significant WT Performance Regression on &amp;quot;modified&amp;quot; FSM workload&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17021&quot;&gt;&lt;del&gt;SERVER-17021&lt;/del&gt;&lt;/a&gt; Blacklist findAndModify_update_grow.js to prevent spurious MCI timeouts&lt;/p&gt;

&lt;p&gt;Closes #917&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6fdd15e3e68c53d555ddd40402aefd156507b6a8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6fdd15e3e68c53d555ddd40402aefd156507b6a8&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="62631" name="findAndModify_update_grow.js" size="4414" author="daniel.alabi@10gen.com" created="Fri, 23 Jan 2015 14:54:12 +0000"/>
                            <attachment id="62632" name="fsm_all.js" size="1116" author="daniel.alabi@10gen.com" created="Fri, 23 Jan 2015 14:54:12 +0000"/>
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                            <customfieldvalue>&lt;p&gt;The findAndModify_update_grow.js FSM workload spawns several threads. Each thread inserts a single document into a collection and then, using the findAndModify command, attempts to trigger a document move by growing (doubling) the size of the inserted document using the $set and $mul update operators.&lt;/p&gt;

&lt;p&gt;The &quot;modified&quot; jstests/concurrency/fsm_workloads/findAndModify_update_grow.js uses 20 threads and 50 steps (iterations = 50) and attempts to quadruple the size of the document.&lt;/p&gt;

&lt;p&gt;My experiments were done on a rhel55-test spawnhost (8GB RAM and 8GB disk space).&lt;/p&gt;

&lt;p&gt;On mmapv1, running the attached fsm_all.js takes about 2 mins but for WT it kept running for 30+ mins (until I shut it down).&lt;/p&gt;

&lt;p&gt;WT invocation:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;python buildscripts/smoke.py --nopreallocj --with-cleanbb --mongod ~/mongodb-linux-64/bin/mongod --mongo ~/mongodb-linux-64/bin/mongo --continue-on-failure --storageEngine=wiredTiger --wiredTigerEngineConfig=cache_size=1G concurrency &lt;/span&gt;&lt;/pre&gt;
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