[Bug libc/18441] Performance regression due to strcoll_l changes

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18441

--- Comment #3 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Daniel Lichtenberger from comment #2)
> I ran it on Fedora Rawhide (at glibc development release 2.21.90), but it
> still seemed way slower than before.
> 
> I will try to come up with a meaningful sample of input data. Is the
> benchmark mentioned in the commit messages available in the glibc source
> tree?

Yes it is. It's the "benchtests" directory under the top-level glibc checkout.
See benchtets/README for more information. The benchmark tests can be run after
a glibc build, so you need to build glibc (but not install it) to run the tests
against your built libraries. In Fedora/RHEL we're working on packaging the
benchmark libraries so you can run them without needing to do a glibc build,
that way you could test your hardware quickly if you found a performance
regression.

To build glibc see:
https://sourceware.org/glibc/wiki/Testing/Builds
Though it should be as easy as configure/make.

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