[mvapich-discuss] mvapich2-0.9.8 blacs problems

[Dhabaleswar Panda]

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.

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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