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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-64323] windows ldap tests failing with concurrency </title>
                <link>https://jira.mongodb.org/browse/SERVER-64323</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The jobs for resmoke tests on windows for external auth suite were limited in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64322&quot; title=&quot;reduce resmoke jobs for external_auth on windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64322&quot;&gt;&lt;del&gt;SERVER-64322&lt;/del&gt;&lt;/a&gt; to get the test passing again. This seems related to MSVS 2022. Possibly there is a new security feature related to MSVS 2022 where concurrent ldap request get limited. There needs to be a deeper investigation related to ldap and concurrency in the context of MSVS 2022.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1996783">SERVER-64323</key>
            <summary>windows ldap tests failing with concurrency </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="13201">Fixed</resolution>
                                        <assignee username="sergey.galtsev@mongodb.com">Sergey Galtsev</assignee>
                                    <reporter username="daniel.moody@mongodb.com">Daniel Moody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Mar 2022 15:12:32 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:26 +0000</updated>
                            <resolved>Fri, 10 Jun 2022 20:04:06 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4607985" author="xgen-internal-githook" created="Fri, 10 Jun 2022 19:50:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;sergey.galtsev&apos;, &apos;email&apos;: &apos;sergey.galtsev@mongodb.com&apos;, &apos;username&apos;: &apos;brushless-glitch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64323&quot; title=&quot;windows ldap tests failing with concurrency &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64323&quot;&gt;&lt;del&gt;SERVER-64323&lt;/del&gt;&lt;/a&gt; limit number of external_auth jobs only on windows&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b0d49742e1dd9462262593fe844bf3e65bca1d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b0d49742e1dd9462262593fe844bf3e65bca1d7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4600820" author="JIRAUSER1258160" created="Tue, 7 Jun 2022 22:04:44 +0000"  >&lt;p&gt;Plan to go forward is:&lt;/p&gt;

&lt;p&gt;1. Windows will be running in single test mode, Linux will run multiple&lt;br/&gt;
2. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67094&quot; title=&quot;Implement retry logic in LDAP&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67094&quot;&gt;&lt;del&gt;SERVER-67094&lt;/del&gt;&lt;/a&gt; opened to address intermittent retryable ldap errors&lt;/p&gt;</comment>
                            <comment id="4590871" author="JIRAUSER1258160" created="Thu, 2 Jun 2022 18:19:36 +0000"  >&lt;p&gt;I opened &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67010&quot; title=&quot;Investigate and resolve slow startup on windows due to SymInitialize&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67010&quot;&gt;&lt;del&gt;SERVER-67010&lt;/del&gt;&lt;/a&gt; for  &lt;del&gt;I am transferring the ticket to&lt;/del&gt; Service Arch to decide what (if anything) should be done to startup sequence.&lt;/p&gt;
</comment>
                            <comment id="4567580" author="billy.donahue" created="Mon, 23 May 2022 20:26:42 +0000"  >&lt;p&gt;Abseil does something that might help with the startup cost?&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/third_party/abseil-cpp-master/abseil-cpp/absl/debugging/symbolize_win32.inc#L47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/master/src/third_party/abseil-cpp-master/abseil-cpp/absl/debugging/symbolize_win32.inc#L47&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;  &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Symbols are not loaded until a reference is made requiring the&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;  &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// symbols be loaded. This is the fastest, most efficient way to use&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;  &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// the symbol handler.&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;  SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME);&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;  &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&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; (!SymInitialize(process, nullptr, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&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;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
</comment>
                            <comment id="4566619" author="JIRAUSER1258160" created="Mon, 23 May 2022 15:57:24 +0000"  >&lt;p&gt;There is a fix available, however it is not possible to reliably verify it within our present test harness. While discussing situation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=andrew.morrow%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;andrew.morrow@mongodb.com&quot;&gt;andrew.morrow@mongodb.com&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.broadstone%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matt.broadstone@mongodb.com&quot;&gt;matt.broadstone@mongodb.com&lt;/a&gt;, we decided to put the ticket on a back-burner up until the windows stack trace functionality testing is implemented. Linking to PM-2926, and must be revisited once a ticket is raised to verify specifically windows stack trace generation&lt;/p&gt;</comment>
                            <comment id="4563545" author="JIRAUSER1258160" created="Fri, 20 May 2022 20:47:49 +0000"  >&lt;p&gt;The difference between VS2019 and VS2022 builds was identified: &lt;tt&gt;SymInitializeW&lt;/tt&gt; will take ~0.6 sec on VS2019 builds, and ~1.5 sec on VS2022. That seems to match tests in which mongod starting up and then immediately shutting down exhibited difference in run time of ~1 sec.&lt;/p&gt;

&lt;p&gt;After &lt;a href=&quot;https://spruce.mongodb.com/version/628680367742ae2315949608/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commenting out&lt;/a&gt; &lt;tt&gt;SymbolHandler&lt;/tt&gt; initialization code, I &lt;a href=&quot;https://spruce.mongodb.com/task/mongodb_mongo_master_enterprise_windows_required_external_auth_patch_5dff90ff1e8a672a8716f0c9c936f8f50e56fd0b_628680367742ae2315949608_22_05_19_17_37_14/tests?execution=5&amp;amp;sortBy=STATUS&amp;amp;sortDir=ASC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tried running external_auth 6 times&lt;/a&gt; in attempt to reproduce failures, and it was successful every time&lt;/p&gt;</comment>
                            <comment id="4546637" author="JIRAUSER1258160" created="Thu, 12 May 2022 22:44:46 +0000"  >&lt;p&gt;This is preliminary report on the subject, which I am posting to summarize what I found so far. I have not at this time found root cause for any of the issues described&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Setting%3A&quot;&gt;&lt;/a&gt;Setting:&lt;/h2&gt;

&lt;p&gt;Distro: windows-vsCurrent-xlarge. Binaries compiled using following command lines:&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;python buildscripts\scons.py MSVC_VERSION=14.2 MONGO_DISTMOD=windows VARIANT_DIR=2019 ^&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;    CPPPATH=&quot;c:/sasl/include c:/snmp/include&quot; LIBPATH=&quot;c:/sasl/lib c:/snmp/lib&quot; ^&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;    install-core&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;rmdir build\2019\install /s/q&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;move build\install build\2019\install&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;   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\scons.py MSVC_VERSION=14.3 MONGO_DISTMOD=windows VARIANT_DIR=2022 ^&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;    CPPPATH=&quot;c:/sasl/include c:/snmp/include&quot; LIBPATH=&quot;c:/sasl/lib c:/snmp/lib&quot; ^&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;    install-core&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;rmdir build\2022\install /s/q&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;move build\install build\2022\install&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;Running vcvarsall.bat seems to not affect result of build and how resulting binaries behave&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Analysis%3A&quot;&gt;&lt;/a&gt;Analysis:&lt;/h2&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;msvc env (14.2 vs 14.3) makes difference in following aspects:
	&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
		&lt;li&gt;fast test (ldap_authz_bind.js) completes in 3 to 4 sec when binaris are built using 14.2 vs 5-6 sec with 14.3&lt;/li&gt;
		&lt;li&gt;mongod startup time is consistently higher with 14.3. Mongod starting up and immediately exiting executes at ~1.9 sec when built using 14.2, but ~2.7 sec when built using 14.3. That might account for discrepancy in ldap_authz_bind.js&lt;/li&gt;
		&lt;li&gt;ldap_timeout_poolless.js also shows consistent discrepancy between 14.2 and 14.3 builds (~580 vs 610 seconds to complete)&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;msvc env (14.2 vs 14.3) makes no difference other aspects:
	&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
		&lt;li&gt;ldap calls seem to take same amount of time. unit test making actual ldap query performs at same speed with both 14.2 and 14.3 env&lt;/li&gt;
		&lt;li&gt;resulting binary is approximately same length&lt;/li&gt;
		&lt;li&gt;same libs linked&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;in other words, no obvious reason why one would be so consistently slower than another&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Evergreenbuild%3A&quot;&gt;&lt;/a&gt;Evergreen build:&lt;/h2&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;setting MSVC_VERSION=14.3 instead of MSVC_VERSION=14.2 indeed has an effect of enabling often failures&lt;/li&gt;
	&lt;li&gt;errors observed fall into following broad categories:
	&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
		&lt;li&gt;minor discrepancy between expected and received timeouts, example: &quot;assert.time failed timeout 30000ms took 30192ms&quot;&lt;/li&gt;
		&lt;li&gt;&quot;Failed to acquire LDAP group membership&quot;, attributable to &quot;Slow query&quot;. Unclear why this is happening in 14.3 builds&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;Unansweredquestions%3A&quot;&gt;&lt;/a&gt;Unanswered questions:&lt;/h2&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;so far I couldn&apos;t identify root cause: what exactly causes slower startup, why LDAP timeouts go beyond expected, why group membership timeout but only on 14.3 builds.&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;Recommendation%3A&quot;&gt;&lt;/a&gt;Recommendation:&lt;/h2&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;perhaps when testing the timeout we should account for machine possibly running concurrent payloads, or being busy with another task, and double anticipated timeout values. Logic is: we know that if we provide to LDAP timeout value of X seconds, the actual time the call returns will not be exactly X seconds. Measuring &quot;too long&quot; is very subjective, and therefore we should configure the tests with the envelopes which are by far above and beyond nominal value.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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