[mvapich-discuss] NBP Data Traffic Verification Fail

[Sourav Chakraborty]

Hi Hoang-Vu,

We were unable to reproduce the issue you mentioned. Can you please give
some more details about the configuration/build parameters used to build
MVAPICH2 and NPB? You can obtain this information by running mpiname -a.

Also, does the error occur only with class A and SH? How frequently have
you noticed the issue?

Thanks,
Sourav


On Fri, Apr 29, 2016 at 11:11 AM, Hoang-Vu Dang <dang.hvu at gmail.com> wrote:

> The benchmark is DT MPI version inside this tarball
>
> http://www.nas.nasa.gov/assets/npb/NPB3.3.1.tar.gz
>
> It's make with mvapich2 2.1 (gcc/4.9.1) on Stampede cluster with:
>
> cd ~/NPB3.3.1/NPB3.3-MPI/DT
> make CLASS=A
>
> Run wit problem SH for example:
>
> MV2_USE_SHARED_MEM=0 ibrun -np 80 ./dt SH
>
> Sometimes it give correct results:
>
>  DT_SH.A L2 Norm = 610856482.000000
>  Deviation = 0.000000
>
> Sometimes it gives wrong:
>
>  DT_SH.A L2 Norm = 571204151.000000
>  The correct verification value = 610856482.000000
>  Got value = 571204151.000000
>
> Is there anything I can do to debug ? Is it reproducible ?
>
>
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