[Trilinos-Users] [EXTERNAL] MTSGS Smoother Behavior

Rajamanickam, Sivasankaran srajama at sandia.gov
Wed Mar 13 17:00:05 EDT 2019


Duncan
  MT-SGS uses coloring and multithreading using the coloring. Slight variations in #iterations are expected when used stand-alone. What is the behavior you are seeing ?

Thanks
Siva

________________________________________
From: Trilinos-Users <trilinos-users-bounces at trilinos.org> on behalf of Duncan Karnitz <dlk at thermoanalytics.com>
Sent: Wednesday, March 13, 2019 2:06 PM
To: trilinos-users
Subject: [EXTERNAL] [Trilinos-Users] MTSGS Smoother Behavior

I am investigating some inconsistent multi-threaded behavior when using
the MueLu MTSGS smoother. When using more than one thread, we see that
no two runs of our solve code produce the same convergence behavior.

Is there anything in the MTSGS implementation that might not reproduce
the same computations each time when using more than one thread?

Thank you,
Duncan Karnitz
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