[mvapich-discuss] mvapich2-0.9.8 blacs problems

[Bas van der Vlies]

Dhabaleswar Panda wrote:
> Hi Bas, 
> 
>>   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
> 
> Thanks for reporting this. Just to check ... are you using the latest
> mvapich 0.9.9 from the trunk or the beta tarball released on 02/09/07.
> A lot of successive fixes and tunings have gone since the beta version
> was released. You can get the latest version of the trunk through SVN
> checkout or downloading the nightly tarballs of the trunk.
> 
I downloaded the tarball. We will test the latest trunk version.

Regards

> Best Regards, 
> 
> DK
> 
>> 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                                               *
>> *                                                                  *
>> ********************************************************************
>> _______________________________________________
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>> mvapich-discuss at cse.ohio-state.edu
>> http://mail.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
>>
> 


-- 
********************************************************************
*                                                                  *
*  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                                               *
*                                                                  *
********************************************************************