[mvapich-discuss] mvapich2-0.9.8 blacs problems

[Bas van der Vlies]

wei huang wrote:
> Hi,
> 
> Thanks for letting us know the problem.
> 
> We will take a look at it and get back to you.
> 
Wei,

  We have done some further testing with mvapich version:
   * 0.9.8 everything works

   * 0.9.9-beta it very slow and it hangs also like mvapich2

Regards

> Thanks.
> 
> Regards,
> Wei Huang
> 
> 774 Dreese Lab, 2015 Neil Ave,
> Dept. of Computer Science and Engineering
> Ohio State University
> OH 43210
> Tel: (614)292-8501
> 
> 
> On Mon, 19 Mar 2007, Bas van der Vlies wrote:
> 
>> 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
>> --
>> ********************************************************************
>> *                                                                  *
>> *  Bas van der Vlies                     e-mail: basv at sara.nl      *
>> *  SARA - Academic Computing Services    phone:  +31 20 592 8012   *
>> *  Kruislaan 415                         fax:    +31 20 6683167    *
>> *  1098 SJ Amsterdam                                               *
>> *                                                                  *
>> ********************************************************************
>>
> 


-- 
********************************************************************
*                                                                  *
*  Bas van der Vlies                     e-mail: basv at sara.nl      *
*  SARA - Academic Computing Services    phone:  +31 20 592 8012   *
*  Kruislaan 415                         fax:    +31 20 6683167    *
*  1098 SJ Amsterdam                                               *
*                                                                  *
********************************************************************