[mvapich-discuss] mvapich2-0.9.8 blacs problems

[Bas van der Vlies]

wei huang wrote:
> Hi,
> 
> Thanks for letting us know the problem. We have generated a patch to
> address this problem, and have applied it to both the trunk and our svn
> 0.9.8 branch.
> 
>
We have done some more tests and found some other problem using mvapich2 
and blacs. This problems are encountered by user programs. We get 
reports from our users that they get wrong answers from their programs.

We have made a small fortran (g77) to illustrate a problem.
The calls a number of times the same scalapack routine. Independent of 
the size of the problem the program hangs after 8 or 31 iterations 
except when number of processes is a square, eg 1x1, 2x2, ...

How to compile the program:
mpif77 -Wall -g -O0 -o scal scal.f -lscalapack -lfblacs -lcblacs -lblacs 
-llapack -latlas

The program expects on standard input:
<size of matrix> <block size> <number of iterations>

for example:
  echo '100 16 100' | mpiexec -n <np> ./scal

Regards


PS) This program behaves correctly with topspin/ciso software which is 
based on their infiniband stack and bases on mvapich1 version.

We gona test the program in mvapiach1 from OSU
-- 
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*                                                                  *
*  Bas van der Vlies                     e-mail: basv at sara.nl      *
*  SARA - Academic Computing Services    phone:  +31 20 592 8012   *
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