Hello,
I am trying to use OpenMP inside an application that uses OpenSceneGraph.
I can get OpenMP to use multiple threads inside my examples, but NOT
inside my my OpenSceneGraph app. I think that I may have tracked the
problem down to the use of sched_setaffinity inside files in
.../OpenThreads/pthreads. It seems that inside CMakelists.txt in that
directory, pthread_setaffinity_np is not being found and
sched_setaffinity calls are being made that kill multi-processor
availability.
From CMakeLists.txt:
CHECK_FUNCTION_EXISTS(pthread_setaffinity_np HAVE_PTHREAD_SETAFFINITY_NP)
IF(HAVE_PTHREAD_SETAFFINITY_NP)
ADD_DEFINITIONS(-DHAVE_PTHREAD_SETAFFINITY_NP)
ELSE(HAVE_PTHREAD_SETAFFINITY_NP)
CHECK_CXX_SOURCE_COMPILES("
#include <sched.h>
int main() {
cpu_set_t cpumask;
sched_setaffinity( 0, sizeof(cpumask), &cpumask );
return 0;
}" HAVE_THREE_PARAM_SCHED_SETAFFINITY)
IF(HAVE_THREE_PARAM_SCHED_SETAFFINITY)
ADD_DEFINITIONS(-DHAVE_THREE_PARAM_SCHED_SETAFFINITY)
ELSE(HAVE_THREE_PARAM_SCHED_SETAFFINITY)
CHECK_CXX_SOURCE_COMPILES("
#include <sched.h>
int main() {
cpu_set_t cpumask;
sched_setaffinity( 0, &cpumask );
return 0;
}" HAVE_TWO_PARAM_SCHED_SETAFFINITY)
IF(HAVE_TWO_PARAM_SCHED_SETAFFINITY)
ADD_DEFINITIONS(-DHAVE_TWO_PARAM_SCHED_SETAFFINITY)
ENDIF(HAVE_TWO_PARAM_SCHED_SETAFFINITY)
ENDIF(HAVE_THREE_PARAM_SCHED_SETAFFINITY)
ENDIF(HAVE_PTHREAD_SETAFFINITY_NP)
so I see:
[EMAIL PROTECTED] src]$ find . -exec grep -n -H sched_setaffinity {} \;
./OpenThreads/pthreads/CMakeLists.txt:73: sched_setaffinity( 0,
sizeof(cpumask), &cpumask );
./OpenThreads/pthreads/CMakeLists.txt:83: sched_setaffinity( 0, &cpumask );
./OpenThreads/pthreads/PThread.c++:135: sched_setaffinity( 0,
sizeof(cpumask), &cpumask );
./OpenThreads/pthreads/PThread.c++:137: sched_setaffinity( 0,
&cpumask );
./OpenThreads/pthreads/PThread.c++:549: sched_setaffinity( 0,
sizeof(cpumask), &cpumask );
./OpenThreads/pthreads/PThread.c++:551: sched_setaffinity( 0,
&cpumask );
./OpenThreads/pthreads/PThread.c++:984: sched_setaffinity( 0,
sizeof(cpumask), &cpumask );
./OpenThreads/pthreads/PThread.c++:986: sched_setaffinity( 0,
&cpumask );
./OpenThreads/pthreads/GNUmakefile:43:ifeq
($(COMPILE_USING_TWO_PARAM_sched_setaffinity),yes)
./OpenThreads/pthreads/GNUmakefile:44:DEF +=
-DCOMPILE_USING_TWO_PARAM_sched_setaffinity
I am compiling this myself with GCC 4.3.2 (that I also compile myself),
so I am not out-of-date with my compiler.
What do I need to do to get this working? Must I run on only a single
processor? I have an 8 processor PC and huge jobs to run on it.
My app also must run in windows (sigh). Will the MS Visual Studio 2005
compiler be a problem?
Ralph
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