Hi Chris - I should correct the description of X10RT_CPUMAP below. This
environment variable was designed for the case where
X10_STATIC_THREADS=true and X10_NTHREADS=1, which is how we run many of our
benchmarks. Each line of the file pointed to by X10RT_CPUMAP corresponds
to a binding between a place and a CPU, not between a thread within a place
and a CPU. So what you are seeing is what was intended, as all your
threads are in the same place, and so they all bind to the same CPU. We
could design and implement a thread-CPU binding as you are looking for, but
we currently don't have an implementation of that today.
As for the extra threads, I tried running our NQueensDist sample program
with X10_STATIC_THREADS=true and X10_NTHREADS=1, and I see that we get
three threads, when we should be getting one. The extra threads appear to
be coming from our garbage collector. We'll look into this further.
- Ben
|------------>
| From: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|"Christopher Frieler" <chris-frie...@gmx.net>
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| To: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Mailing list for users of the X10 programming language
<x10-users@lists.sourceforge.net>,
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Date: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|02/27/2012 11:15
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Subject: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Re: [X10-users] More threads than specified in X10_NTHREADS.
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
I just ran my program again with different values for X10_NTHREADS and
there were always 8 threads more than the worker-threads. So at least it
seems to be deterministic, but I'm still wondering what these extra threads
are good for.
I'm running my program with c++-backend and Sockets-runtime and
X10RT_CPUMAP does not work as desired. All worker-threads are bound to the
same CPU whose index stands in the first line of the map-file.
All this does not happen with a special testcase, but with all x10-programs
I tested.
--Christopher
-------- Original-Nachricht --------
> Datum: Mon, 27 Feb 2012 09:18:08 -0500
> Von: Benjamin W Herta <bhe...@us.ibm.com>
> An: Mailing list for users of the X10 programming language
<x10-users@lists.sourceforge.net>
> Betreff: Re: [X10-users] More threads than specified in X10_NTHREADS.
> 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
>
> |
>
>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
> |------------>
> | Subject: |
> |------------>
>
>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
> |Re: [X10-users] More threads than specified in X10_NTHREADS.
>
> |
>
>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
>
>
>
>
>
> 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
> >
> > --
> > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
> > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de
> >
> >
>
------------------------------------------------------------------------------
>
> > Try before you buy = See our experts in action!
> > The most comprehensive online learning library for Microsoft developers
> > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3,
MVC3,
> > Metro Style Apps, more. Free future releases when you subscribe now!
> > http://p.sf.net/sfu/learndevnow-dev2
> > _______________________________________________
> > X10-users mailing list
> > X10-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/x10-users
>
------------------------------------------------------------------------------
>
> Try before you buy = See our experts in action!
> The most comprehensive online learning library for Microsoft developers
> is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
> Metro Style Apps, more. Free future releases when you subscribe now!
> http://p.sf.net/sfu/learndevnow-dev2
> _______________________________________________
> X10-users mailing list
> X10-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/x10-users
>
>
------------------------------------------------------------------------------
> Try before you buy = See our experts in action!
> The most comprehensive online learning library for Microsoft developers
> is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
> Metro Style Apps, more. Free future releases when you subscribe now!
> http://p.sf.net/sfu/learndevnow-dev2
> _______________________________________________
> X10-users mailing list
> X10-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/x10-users
--
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de
------------------------------------------------------------------------------
Try before you buy = See our experts in action!
The most comprehensive online learning library for Microsoft developers
is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
Metro Style Apps, more. Free future releases when you subscribe now!
http://p.sf.net/sfu/learndevnow-dev2
_______________________________________________
X10-users mailing list
X10-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/x10-users
------------------------------------------------------------------------------
Try before you buy = See our experts in action!
The most comprehensive online learning library for Microsoft developers
is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
Metro Style Apps, more. Free future releases when you subscribe now!
http://p.sf.net/sfu/learndevnow-dev2
_______________________________________________
X10-users mailing list
X10-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/x10-users
