Charm++ parallel programming system

[Gengbin Zheng <zhenggb AT gmail.com>]

You are right. That was also fixed in a separate check in.
I was in NCSA meeting (which is supposed to be laptop-less), not reading my
emails often. Also my email was stuck waiting for moderator approval.

Gengbin


On Thu, Jan 28, 2010 at 1:59 PM, Phil Miller 
<mille121 AT illinois.edu>
 wrote:

> On Thu, Jan 28, 2010 at 13:20, Gengbin Zheng 
> <zhenggb AT gmail.com>
>  wrote:
> >
> > Looks like there is a bug in AMPI_Cart_shift.
> > The understanding of rank_source is not correct in our implementation.
> > rank_source is not "myrank", it is the "left nearby" neighbor processor
> > rank.
> > I already have a fix that makes it working. I will check it in soon.
>
> I was already working on this, but had to go to class before you
> emailed. I found the same thing, fixed it similarly, and also found
> another bug, that we don't handle negative displacements correctly.
> I'm fixing that now.
>
> Phil
>
>
> > Gengbin
> >
> >
> > On Thu, Jan 28, 2010 at 11:42 AM, Phil Miller 
> > <mille121 AT illinois.edu>
> wrote:
> >>
> >> By modifying the program to make its own periodic domain on
> >> MPI_COMM_WORLD, rather than using a cartesian communicator
> >> (Cart_create, Cart_shift), the program ran successfully. The modified
> >> code is attached. I'll investigate why the Cart_create and Cart_shift
> >> functions are going awry.
> >>
> >> Phil
> >>
> >> On Thu, Jan 28, 2010 at 10:54, Phil Miller 
> >> <mille121 AT illinois.edu>
> wrote:
> >> > On Thu, Jan 28, 2010 at 07:50, 张凯 
> >> > <zhangk1985 AT gmail.com>
> >> >  wrote:
> >> >> hi:
> >> >>
> >> >> I am a beginner of AMPI and trying to run a MPI program using it. But
> i
> >> >> found a little problem.
> >> >>
> >> >> Here(
> >> >>
> >> >>
> http://www.mcs.anl.gov/research/projects/mpi/usingmpi/examples/advmsg/nbodypipe_c.htm
> )
> >> >> you can find an example of a MPI program. I have successfully built
> >> >> and
> >> >> run it using both MPICH and intel MPI.
> >> >>
> >> >> However, when i running it with AMPI, i found that the program was
> >> >> blocked
> >> >> by MPI_Waitall function and never return again.
> >> >>
> >> >> I just run it with ++local +p2 +vp2 options. Did i miss other
> options?
> >> >> or
> >> >> misconfig AMPI?
> >> >
> >> > I'm seeing the same effect as you describe on a net-linux-x86_64 build
> >> > of AMPI from the latest charm sources. We'll look into this and get
> >> > back to you.
> >> >
> >> > For reference, the attached code (with added prints) produces the
> >> > following:
> >> >
> >> > $ ./charmrun nbp +vp 4 20 +p4
> >> > Charm++: scheduler running in netpoll mode.
> >> > Charm++> cpu topology info is being gathered.
> >> > Charm++> Running on 1 unique compute nodes (8-way SMP).
> >> > Iteration 9
> >> > Iteration 9:0 a
> >> > Iteration 9
> >> > Iteration 9:0 a
> >> > Iteration 9
> >> > Iteration 9:0 a
> >> > Iteration 9
> >> > Iteration 9:0 a
> >> > Iteration 9:0 b
> >> > Iteration 9:0 b
> >> > Iteration 9:0 b
> >> > Iteration 9:0 b
> >> >
> >>
> >> _______________________________________________
> >> charm mailing list
> >> charm AT cs.uiuc.edu
> >> http://lists.cs.uiuc.edu/mailman/listinfo/charm
> >>
> >
> >
> >
> > --
> > --------------------------------------------
> > Gengbin Zheng,  Ph.D.
> > Research Scientist
> > Parallel Programming Laboratory
> > Department of Computer Science
> > University of Illinois at Urbana-Champaign
> > 201 N. Goodwin Ave.
> > Urbana, IL 61801
> >
>



-- 
--------------------------------------------
Gengbin Zheng,  Ph.D.
Research Scientist
Parallel Programming Laboratory
Department of Computer Science
University of Illinois at Urbana-Champaign
201 N. Goodwin Ave.
Urbana, IL 61801