RE: AMD vs Intel
Leonid - when you say different. What do you mean? Fixed effect and random
effects? Different OFV?
We did a poster at AAPS a decade or so ago comparing results across different
platforms using the same data and model. We got different results on the
standard errors (which related to matrix inversion and how those are done using
software-hardware configurations). And with overparameterized models we got
different error messages - some platforms converged with no problem while some
did not converge and gave R matrix singularity.
Did your problems go beyond this?
pete
Peter Bonate, PhD
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Quoted reply history
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of
Leonid Gibiansky
Sent: Monday, November 18, 2019 11:05 AM
To: nmusers <[email protected]>
Subject: [NMusers] AMD vs Intel
Dear All,
I am testing the new Epyc processors from AMD (comparing with Intel Xeon), and
getting different results. Just wondering whether anybody faced the problem of
differences between AMD and Intel processors and knows how to solve it. I am
using Intel compiler but ready to switch to gfortran or anything else if this
would help to get identical results.
There were reports of Intel slowing the AMD execution in the past, but in my
tests, speed is comparable but the results differ.
Thanks
Leonid