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Subject: Re: [OMPI users] Hair depleting issue with Ompi143 and one program
From: David Mathog (mathog_at_[hidden])
Date: 2011-01-20 18:36:54

> (And yes, as far as I
> can tell it invokes emms before any floating point operations are run
> after each MMX usage.)

Is there anything in Ompi which is likely to cause one of the MMX
routines to be interrupted in such a way that the MMX state is not
saved? The bugs that arise when emms is not invoked after an MMX run
can be very strange. Grasping at straws here though, presumably both
the OS and MPI (it it does this at all) preserve the state of all
registers when swapping processes around on a machine.


David Mathog
Manager, Sequence Analysis Facility, Biology Division, Caltech