[Bug 448346] Re: OpenMP "feature" causes massive performance issues on multi-cores

Andrew Dodd atd7 at cornell.edu
Mon Feb 1 01:31:23 UTC 2010


I should have put more information in my post:
Ubuntu 9.10, Core 2 Quad Q6600.

When loading a PEF image from a Pentax camera, the preview window takes
forever to draw, and performance is very variable and unpredictable.
UFRaw will just freeze periodically after drawing a few tiles.  This
also affects anything that causes the preview window to change, such as
exposure changes.

When OMP_NUM_THREADS is set to 1 as an environment variable, preview
redraws are fast and predictable in the time they take.

-- 
OpenMP "feature" causes massive performance issues on multi-cores
https://bugs.launchpad.net/bugs/448346
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