Public bug reported:
Binary package hint: ufraw
The parallelization of UFRaw is so bad that it is actually (a lot)
faster to run it with OMP_NUM_THREADS=1 to disable OpenMP
parallelizations on my Core2 Quad. It seems like the parallelization was
done over too small chunks to amortize the thread startup cost.
I'd suggest disabling OpenMP support in UFRaw to improve performance.
The current version is barely usable, the slowdown is probably (at
least) 10x.
ProblemType: Bug
Architecture: amd64
Date: Sun Oct 11 01:10:46 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: fglrx
Package: ufraw 0.15-2ubuntu1
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-13.43-generic
SourcePackage: ufraw
Uname: Linux 2.6.31-13-generic x86_64
** Affects: ufraw (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug
--
OpenMP "feature" causes massive performance issues on multi-cores
https://bugs.launchpad.net/bugs/448346
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