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Subject: Re: [OMPI users] EXTERNAL: Re: How could OpenMPI (or MVAPICH) affect floating-point results?
From: Blosch, Edwin L (edwin.l.blosch_at_[hidden])
Date: 2011-09-20 12:45:39


Thank you for this explanation. I will assume that my problem here is some kind of memory corruption.

-----Original Message-----
From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]] On Behalf Of Tim Prince
Sent: Tuesday, September 20, 2011 10:36 AM
To: users_at_[hidden]
Subject: Re: [OMPI users] EXTERNAL: Re: How could OpenMPI (or MVAPICH) affect floating-point results?

On 9/20/2011 10:50 AM, Blosch, Edwin L wrote:

> It appears to be a side effect of linkage that is able to change a compute-only routine's answers.
>
> I have assumed that max/sqrt/tiny/abs might be replaced, but some other kind of corruption may be going on.
>

Those intrinsics have direct instruction set translations which
shouldn't vary from -O1 on up nor with linkage options nor be affected
by MPI or insertion of WRITEs.

-- 
Tim Prince
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