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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Store per-thread copy of the global locale"
href="https://bugs.llvm.org/show_bug.cgi?id=46600">46600</a>
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<th>Summary</th>
<td>Store per-thread copy of the global locale
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>nickita.taranov@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<p>
<div>
<pre>That's not news that users of std::stringstream may suffer from the atomic
add_shared, release_shared (within ctor and dtor of std::locale) accompanying
each stringstream creation and deletion.
Though it is expected to be noticeable only on very heavy multicore servers I
personally saw an impact on performance of our service running on a machine
with 2 x INTEL Xeon E5-2660 v4.
So, this idea was discussed e.g here:
<a href="https://groups.google.com/a/isocpp.org/g/std-discussion/c/uLTjDh41sNM/m/QF-yWrB0BgAJ">https://groups.google.com/a/isocpp.org/g/std-discussion/c/uLTjDh41sNM/m/QF-yWrB0BgAJ</a>
.
And as far as I understood the only con is it will bring additional complexity
to the implementation.
So, may we get back to discussion of this enhancement?</pre>
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</p>
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