X10RT_CPUMAP is supported for all x10rt implementations under the c++
backend, including sockets, standalone, mpi, and pami.
- Ben
|------------>
| From: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Olivier Tardieu/Watson/IBM@IBMUS
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| To: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Mailing list for users of the X10 programming language
<x10-users@lists.sourceforge.net>,
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Date: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|02/27/2012 09:10
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| Subject: |
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|Re: [X10-users] More threads than specified in X10_NTHREADS.
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>--------------------------------------------------------------------------------------------------------------------------------------------------|
Hi,
We support thread affinity via the X10RT_CPUMAP env variable.
But I think the setting is only supported for x10rt pami.
Moreover this only gives control over X10_NTHREADS.
Any other thread dynamically added by the runtime is free to roam.
Therefore X10RT_CPUMAP is only intended to be used in combination
with X10_STATIC_THREADS=true for those programs which execute
to completion with X10_STATIC_THREADS set.
One has to set X10RT_CPUMAP=map where
map is the name of a file.
This file must have at least X10_NTHREADS lines.
Line p should contain the integer index of the hardware thread that logical
thread p should be bound to.
Usually,
$cat map
0
1
2
3
4
5
...
I suppose we could look into adding the same support to other x10rt
implementations.
Olivier
"Christopher Frieler" <chris-frie...@gmx.net> wrote on 02/27/2012 03:39:48
AM:
> From: "Christopher Frieler" <chris-frie...@gmx.net>
> To: Mailing list for users of the X10 programming language <x10-
> us...@lists.sourceforge.net>, X10-users@lists.sourceforge.net,
> Date: 02/27/2012 03:40 AM
> Subject: Re: [X10-users] More threads than specified in X10_NTHREADS.
>
> In addition: is it possible to launch the x10-environment first, pin
> each workerthread to a CPU and then start my application?
>
> -------- Original-Nachricht --------
> > Datum: Sun, 26 Feb 2012 15:23:05 +0100
> > Von: "Christopher Frieler" <chris-frie...@gmx.net>
> > An: X10-users@lists.sourceforge.net
> > Betreff: [X10-users] More threads than specified in X10_NTHREADS.
>
> > Hi,
> >
> > I’m running my x10-program with the environment-variable X10_NTHREADS
> > set to different values and X10_STATIC_THREADS set to “true”, but
> > everytime I get many more threads than the worker-threads. Further
> the number of
> > actual threads is neither higher than the number of worker-threads by a
> > constant offset, nor does it grow linearly with the number of
> worker-threads.
> > During the calculations only as many threads as specified in
X10_NTHREADS
> > are up to 100% busy.
> > I could imagine a few more threads for scheduling and
garbage-collection,
> > but what are all the other threads doing? Can anyoneone tell me? I’m
> > using native C++-backend.
> >
> > Thanks in advance,
> > Christopher
>
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