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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Threading.PhysicalConcurrency test fails when available cpus < physical cpus"
href="https://bugs.llvm.org/show_bug.cgi?id=45556">45556</a>
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<th>Summary</th>
<td>Threading.PhysicalConcurrency test fails when available cpus < physical cpus
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Support Libraries
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>john.brawn@arm.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<div>
<pre>If I do
taskset -c 0 ./unittests/Support/SupportTests
--gtest_filter=Threading.PhysicalConcurrency
then the test fails with
/home/jb/work/llvm-project/llvm/unittests/Support/Threading.cpp:25: Failure
Expected: (Num.compute_thread_count()) <=
(hardware_concurrency().compute_thread_count()), actual: 4 vs 1
Num.compute_thread_count() examines /proc/cpuinfo which (on my machine) says
there are 4 cpus, hardware_concurrency().compute_thread_count() calls
sched_getaffinity which says there's one available cpu.
It looks like the commit that caused this to fail is:
commit 8404aeb56a73ab24f9b295111de3b37a37f0b841
Author: Alexandre Ganea <<a href="mailto:alexandre.ganea@ubisoft.com">alexandre.ganea@ubisoft.com</a>>
Date: Thu Feb 13 22:49:57 2020 -0500
[Support] On Windows, ensure hardware_concurrency() extends to all CPU
sockets and all NUMA groups</pre>
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