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<a href="https://gitlab.rtems.org/joel">Joel Sherrill</a> created an issue: <a href="https://gitlab.rtems.org/rtems/tools/rtems-tools/-/issues/15">#15</a>
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<a href="#summary" aria-hidden="true" class="anchor" id="user-content-summary" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Summary</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">When used with a gdb based simulator like psim, rtems-test uses multiple file descriptors -- one for gdb.cfg and multiple for pipes. On a server with 56 cores, I encountered the following failure:</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial"><code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>[572/675] p:491 f:5 u:6 e:22 I:0 B:3 t:0 L:0 i:0 W:0 | powerpc/psim: spsem_err02.exe [564/675] p:491 f:5 u:6 e:22 I:0 B:3 t:0 L:0 i:0 W:0 | powerpc/psim: spregion_err01.exe error: error opening config file: /home/joel/rtems-cron-6.1-rc4/tools/6/share/rtems/tester/rtems/version.cfg </code></p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">The error opening the config file is because the process rtems-test has exceeded its allowed maximum of file descriptors. The following snippet is from watching lsof with the pid for rtems-test. We can see that gdb.cfg is open 52 times which seems reasonable give a 56 core machine.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">I did the rtems-test run in one terminal and the lsof commands in another.</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">$ lsof -p 1232936 | grep gdb.cfg | wc -l</span>
<span id="LC2" class="line" lang="plaintext">52</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">But the process has an increasing number of pipes open as the tests continue to execute.</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">[joel@gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l</span>
<span id="LC2" class="line" lang="plaintext">776</span>
<span id="LC3" class="line" lang="plaintext">[joel@gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l</span>
<span id="LC4" class="line" lang="plaintext">819</span>
<span id="LC5" class="line" lang="plaintext">[joel@gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l</span>
<span id="LC6" class="line" lang="plaintext">842</span>
<span id="LC7" class="line" lang="plaintext">[joel@gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l</span>
<span id="LC8" class="line" lang="plaintext">943</span>
<span id="LC9" class="line" lang="plaintext">[joel@gitlab ~]$ lsof -p 1232936 | grep pipe | wc -l</span>
<span id="LC10" class="line" lang="plaintext">951</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">At ~55/675 tests, there are ~165 pipes in the lsof. At ~160/675 tests, there are ~300 pipes in the lsof. It continues to increase.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">All go away when the rtems-test fails and exits.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">The number of file descriptors open for rtems-test do <strong style="font-weight: 600; margin-top: 0;">NOT</strong> increase when using SIS.</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #28272d; margin: 24px 0 16px;" align="initial">
<a href="#steps-to-reproduce" aria-hidden="true" class="anchor" id="user-content-steps-to-reproduce" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Steps to reproduce</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">You should be able to see the number of pipe file descriptors increase on any multi-core machine when using a gdb based simulator. But there must be some mechanism that is able to reclaim them that is able to run. It must not be happening in the higher core environment.</p>
<h3 dir="auto" style="font-size: 1.3em; margin: 24px 0 0;" align="initial">
<a href="#pre-set-options" aria-hidden="true" class="anchor" id="user-content-pre-set-options" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Pre-set options</h3>
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