Charm++ parallel programming system

[Phil Miller <mille121 AT illinois.edu>]

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
>> >
>>
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>>
>
>
>
> --
> --------------------------------------------
> 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
>