If efficient threading is desired I would have thought that these days GPUs
are all the rage and that it would be worth looking into openCL and CUDA
implementations for doing this.
On an unrelated note are there any thoughts on moving CCTBX to Python3? One
issue, which may not be insurmountable is that SCons does not yet support
Python3.
Rob
-----Original Message-----
From: [email protected]
Sent: Tuesday, August 1, 2017 10:16 PM
To: [email protected]
Subject: Re: [cctbxbb] Should we enable boost threads in bootstrap?
Lee,
End game for us is moving to “proper” threading i.e. lots of threads / cores
working on one problem in one address space - be it regular 20 core xeon or
64 core KNL
Boost threads came up in conversation today as a C++11 like threading model,
so I wondered if it would be a stepping stone...
Don’t have this book, maybe should get it….
Cheers Graeme
On 1 Aug 2017, at 18:14, Lee O'Riordan
mailto:[email protected]> wrote:
Graeme, Nigel,
I would be a little bit worried about Boost threads when it comes to our KNL
port of cctbx. In this instance the use of OpenMP or Intel TBB (at least
accordingly to Intel docs) would be optimal over boost threads (or pthreads,
etc.)[see Intel Xeon Phi High Performance Programming, KNL edition P155 ---
no ebook, sorry]. That being said, there is no way to know unless we try it
out first, but it isn't something we can test right now.
As for Threads vs MP, this again falls into our KNL port, where threads
would be better suited (and become a necessity for optimal performance) when
running on high-core count devices. If the OpenMP functionality exists, then
maybe this would be a more portable way of taking advantage of all
cores/hyperthreads.
In this instance I think turning boost threads on for a build-by-build basis
would be better, rather than as a default? Though if I am wrong, feel free
to correct me.
Best,
Lee.
On Tue, Aug 1, 2017 at 9:36 AM, Nigel Moriarty
mailto:[email protected]> wrote:
Graeme
The short answer is "Why?" but that may start a very long discussion. There
are a number of multiprocessing modules in easy_mp that seem to cover all
the bases. Are there situations where threading is "better" to
multiprocessing?
Articles on multiprocessing in cctbx.
https://www.phenix-online.org/newsletter/CCN_2017_01.pdf#page=6
https://www.phenix-online.org/newsletter/CCN_2013_07.pdf
https://www.phenix-online.org/newsletter/CCN_2013_01.pdf
Cheers
Nigel
---
Nigel W. Moriarty
Building 33R0349, Molecular Biophysics and Integrated Bioimaging
Lawrence Berkeley National Laboratory
Berkeley, CA 94720-8235
Phone : 510-486-5709tel:(510)%20486-5709 Email :
[email protected]mailto:[email protected]
Fax : 510-486-5909tel:(510)%20486-5909 Web :
CCI.LBL.govhttp://cci.lbl.gov/
On Tue, Aug 1, 2017 at 7:54 AM,
mailto:[email protected]> wrote:
Afternoon all,
Should we do this? Any opinions? Could be useful for threads in a
semi-portable way...
Thanks & cheerio Graeme
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