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samgh1230 / likwid

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Measurement of Uncore events with likwid-mpirun #158

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
For pure MPI codes measuring Uncore events currently does not work as every 
process measures the Uncore events independently.

The problem is that even if only one process measures per socket some kind of 
syncronization would be necessary across processes to get accurate measurements.

Original issue reported on code.google.com by jan.trei...@gmail.com on 16 Jul 2014 at 10:46

GoogleCodeExporter commented 9 years ago 
Fixed in likwid-mpirun for Likwid 4. The selection which process is measuring 
Uncore counters is done by likwid-mpirun itself. It has the global view and 
therefore can decide which process should measure the Uncore counters.

Original comment by Thomas.R...@googlemail.com on 5 May 2015 at 8:37