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MueLu: anisotropic scaling test stagnates for OpenMP #12549

Open jhux2 opened 1 year ago

jhux2 commented 1 year ago

Bug Report

One of MueLu's scaling tests stagnates for OpenMP vs Serial node. For OpenMP, the test converges in 190 iterations, whereas for Serial node the test converges in ~66 iterations.

To run the test: mpirun -np 4 MueLu_Driver.exe --xml=anisotropic.xml --tol=1e-6 --its=66

PR results: https://trilinos-cdash.sandia.gov/test/41212727

Related to #12533.

github-actions[bot] commented 1 year ago

Automatic mention of the @trilinos/muelu team

jhux2 commented 1 year ago

Probably related to #12351. @GrahamBenHarper

GrahamBenHarper commented 1 year ago

Also worth noting the Cuda build only does a hair better https://trilinos-cdash.sandia.gov/test/41214385 Based on the results, I'm assuming the majority of this difference is caused by BuildAggregatesRandom?

github-actions[bot] commented 5 hours ago

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