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From "Klaus Ma" <kl...@cguru.net>
Subject Re: Review Request 38102: MESOS-3046 (Stout's UUID re-seeds a new random generator during each call to UUID::random)
Date Tue, 15 Sep 2015 09:39:12 GMT


> On Sept. 14, 2015, 11:25 p.m., Ben Mahler wrote:
> > 3rdparty/libprocess/3rdparty/stout/include/stout/uuid.hpp, line 31
> > <https://reviews.apache.org/r/38102/diff/1/?file=1063282#file1063282line31>
> >
> >     Please use THREAD_LOCAL from stout/thread_local.hpp and store a heap object
as done in all of our other uses of THREAD_LOCAL.

Addressed :).


- Klaus


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https://reviews.apache.org/r/38102/#review98950
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On Sept. 15, 2015, 9:39 a.m., Klaus Ma wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/38102/
> -----------------------------------------------------------
> 
> (Updated Sept. 15, 2015, 9:39 a.m.)
> 
> 
> Review request for mesos and Ben Mahler.
> 
> 
> Bugs: MESOS-3046
>     https://issues.apache.org/jira/browse/MESOS-3046
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> __Phenomenon:__
> Performance downgrade
> 
> __Root Cause:__
> stout's UUID abstraction is re-seeding the random generator during each call to UUID::random(),
which is really expensive.
> 
> __Solution:__
> Seeding the random generator only once per thread.
> 
> 
> Diffs
> -----
> 
>   3rdparty/libprocess/3rdparty/stout/include/stout/uuid.hpp e90dabb 
> 
> Diff: https://reviews.apache.org/r/38102/diff/
> 
> 
> Testing
> -------
> 
> make
> make check
> 
> 
> Thanks,
> 
> Klaus Ma
> 
>


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