[llvm-bugs] [Bug 46600] New: Store per-thread copy of the global locale

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46600

            Bug ID: 46600
           Summary: Store per-thread copy of the global locale
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nickita.taranov at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

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:
https://groups.google.com/a/isocpp.org/g/std-discussion/c/uLTjDh41sNM/m/QF-yWrB0BgAJ
.
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?

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