[mvapich-discuss] Possible mvapich bug (possibly not as well).

[Laurence Marks]

Hmmm. I will look at mvapich2, I've been using mvapich.

N.B., mkl 10.0.1 was a bit buggy for my application.

On Fri, Sep 19, 2008 at 5:30 PM, Bharat <mbkumar at gmail.com> wrote:
> I observed a similar problem with a program, which calls SCALAPCK routines.
> The trouble was the program for certain job distribution patterns runs fine
> upto certain stage and then gives no further  output, but the threads run
> @ 100% CPU utilization.
> The same program would run till the end for following cases
> 64 threads on 16nodes (8 cores/node), 64 threads on 8 machines and some
> others,
> but gives problems for 32 threads, 16threads on 16 machines....
> I was using mvapich2-1.0.3, mkl 10.0.1.014 mkl libraries
>
> After replacing mvapich2-1.0.3 with mvapich2-1.2RC2, the problem
> disappeared.
>
>
> Rgds,
> Bharat
>
> On Fri, 19 Sep 2008 14:47:33 -0600, Laurence Marks
> <L-marks at northwestern.edu> wrote:
>
>> I have a highly reproducible, but so far untraceable problem. It could
>> be due to mvapich, but also not.
>>
>> In a code which calls the scalapack subroutine PDSYGST (which uses two
>> distributed matrices), if the matrices are 36927x36927 it works fine;
>> if they are 38381x38381 it runs forever, i.e.until I kill it.
>>
>> This behavior occurs for the Intel mkl versions 10.0.3.020,
>> 10.0.4.023, 10.1.0.009 and ifort/icc versions 10.1.015 and 10.1.018.
>> It occurs for both an April 2008 svn of mvapich, and an svn of a few
>> days ago. It also occurs with OFED-1.2.5.5 and OFED-1.3.
>>
>> I would welcome any suggestions.
>>
>
>
>
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-- 
Laurence Marks
Department of Materials Science and Engineering
MSE Rm 2036 Cook Hall
2220 N Campus Drive
Northwestern University
Evanston, IL 60208, USA
Tel: (847) 491-3996 Fax: (847) 491-7820
email: L-marks at northwestern dot edu
Web: www.numis.northwestern.edu
Chair, Commission on Electron Crystallography of IUCR
www.numis.northwestern.edu/IUCR_CED