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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>
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<item>
            <title>[SERVER-10432] Windows stack trace is very slow</title>
                <link>https://jira.mongodb.org/browse/SERVER-10432</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Stack traces on Windows take more than half a second, even on fast machines.&lt;/p&gt;

&lt;p&gt;You can see the delay in the timestamps in this sample output:&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;
		&lt;tbody &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-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;Mon Aug 05 04:33:02.463 *** stack trace for unhandled exception:&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;Mon Aug 05 04:33:03.340 dbclient_rs_test.exe  ...\src\mongo\client\dbclient_rs_test.cpp(197)                       `anonymous namespace&apos;::UnitTest__AllNodesDown__ReadFromPrimary::_doTest+0x50&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;This stack trace took 0.877 seconds to generate, which is basically forever for a 3.3 GHz CPU.&lt;/p&gt;

&lt;p&gt;The slow code is this line: src/mongo/util/stacktrace.cpp line 183:&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;
		&lt;tbody &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-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;        BOOL ret = SymInitialize(process, getSymbolSearchPath(process), TRUE);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The TRUE parameter is &quot;fInvadeProcess&quot;:&lt;br/&gt;
&lt;a href=&quot;http://msdn.microsoft.com/en-us/library/windows/desktop/ms681351%28v=vs.85%29.aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://msdn.microsoft.com/en-us/library/windows/desktop/ms681351%28v=vs.85%29.aspx&lt;/a&gt;&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;
		&lt;tbody &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-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;fInvadeProcess [in]&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;&amp;nbsp;&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;    If this value is TRUE, enumerates the loaded modules for the process and effectively calls the SymLoadModule64 function for each module.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The issue is that there are (on my machine) 33 DLLs mapped into the address space that mongod.exe is running in, and calling SymLoadModule64() for any of them is almost always a waste of time.  Essentially every stack trace we print contains only locations in mongod.exe, so the time spent loading symbol information that will not be used is wasted.&lt;/p&gt;

&lt;p&gt;The code should instead call SymLoadModule64() for the running .exe file and print only the module name for any address that is not in that file.&lt;/p&gt;</description>
                <environment>Windows</environment>
        <key id="84656">SERVER-10432</key>
            <summary>Windows stack trace is very slow</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="jonathan.reams@mongodb.com">Jonathan Reams</assignee>
                                    <reporter username="tad">Tad Marshall</reporter>
                        <labels>
                    </labels>
                <created>Mon, 5 Aug 2013 09:26:02 +0000</created>
                <updated>Sat, 19 Nov 2016 00:05:32 +0000</updated>
                            <resolved>Thu, 3 Nov 2016 20:58:06 +0000</resolved>
                                                    <fixVersion>3.4.0-rc3</fixVersion>
                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1425629" author="jonathan.reams@10gen.com" created="Thu, 3 Nov 2016 20:58:06 +0000"  >&lt;p&gt;resolved by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26270&quot; title=&quot;Deadlock on Windows when calling currentOp() with bad $where&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26270&quot;&gt;&lt;del&gt;SERVER-26270&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1411426" author="jonathan.reams@10gen.com" created="Tue, 18 Oct 2016 14:48:13 +0000"  >&lt;p&gt;I think this will be fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26270&quot; title=&quot;Deadlock on Windows when calling currentOp() with bad $where&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26270&quot;&gt;&lt;del&gt;SERVER-26270&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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