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Subject: Re: [OMPI users] ScaLAPACK and OpenMPI > 1.3.1
From: Åke Sandgren (ake.sandgren_at_[hidden])
Date: 2010-01-21 17:18:55


On Thu, 2010-01-21 at 15:40 -0600, Champagne, Nathan J. (JSC-EV)[Jacobs
Technology] wrote:
> >What is a correct result then?
>
> The correct results are output by v1.3.1. The filename in the archive is "sol_1.3.1_96.txt".
>
> >How often do you get junk or NaNs compared to correct result.
> We haven't been able to quantify it. It almost seems random; similar to using a variable that's unintialized, expecting its initial value to be zero when it may not be.

In that case i wonder what version of scalapack/blacs you are using?

I have run a bunch of tests with openmpi 1.3.3 and 1.4 all yield the
correct result.
Using Intel 10.1 with lapack 3.1.1 built my me + gotoblas, and also
tried mkl.

Also tried with Pathscale 3.2 with lapack 3.1.1/gotoblas still ok

I tried running with 128 cores too but still the same result (except one
small round-off difference)

I know that scalapack versions prior to 1.8.0 had a couple of bugs with
uninitalized vars.