------- Comment #8 from rrpeter at sandia dot gov 2008-10-13 15:17 -------
Subject: Re: OpenMP thinks that I have 1 processor
on an 8 processor pc
jakub at gcc dot gnu dot org wrote:
> ------- Comment #7 from jakub at gcc dot gnu dot org 2008-10-13 09:43 -------
> sched_getaffinity(3502, 128, { ff, 0, 0, 0 }) = 32
> ....
> sched_getaffinity(3502, 128, { 1, 0, 0, 0 }) = 32
> ...
> sched_getaffinity(3502, 128, { 1, 0, 0, 0 }) = 32
> Shows that the process originally was bound to any of the 8 CPUs (mask 0xff),
> but
> after a while it got confined only to the first CPU. The question is what
> has done that. You can look for sched_setaffinity syscall in the strace dump,
> then either from the surrounding syscalls or under debugger find out where
> sched_setaffinity or pthread_setaffinity_np functions have been called from
> or if the program invokes the syscall directly, without calling a
> libc/libpthread function.
>
>
> --
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37586
>
> ------- You are receiving this mail because: -------
> You reported the bug, or are watching the reporter.
>
>
Hi Jakub,
I did as you asked and get:
sched_setaffinity(24094, 128, { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0 }) = 0
Its buried in other "startup" code:
...................
NOTE: usg::Scene using usg default data file path list
path =
.:/usr/local/share/OpenSceneGraph/data:/usr/local/share/OpenSceneGraph/data/Env:/usr/local/share/OpenSceneGraph/data/fonts:/usr/local/share/OpenSceneGraph/data/Images:/usr/share/OpenSceneGraph/data:/usr/share/OpenSceneGraph/data/Env:/usr/share/OpenSceneGraph/data/fonts:/usr/share/OpenSceneGraph/data/Images
camera number: 0
sched_setaffinity(24094, 128, { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0 }) = 0
INFO> navigation mode set to umbra
Warning: font file "fonts/arial.ttf" not found.
Setting savConfigCB to '::guiWrapper saveConfig'
sLoadFile filename:/home/vision_data/geometry_objects/test.cdf
fileType: lineRowCnt=-1 lineColCnt=-1
std::string UmbModCDFDataSet::LoadFile(const s......
...................................
I suppose that this means that something in Tcl, OpenScenegraph, umbra,
my own rwm is setting the following software to run on only one
processor. I ran a strace -f to get a full "dump" and found that it
occurs between 2 "open(library)" calls. I backtracked to OpenSceneGraph
to find one possibility:
[EMAIL PROTECTED] src]$ pwd
/usr/local/src/OpenSceneGraph-2.4.0/src
[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
($(COMPILE_USING_TWO_PARAM_sched_setaffinity),yes)
./OpenThreads/pthreads/GNUmakefile:44:DEF +=
-DCOMPILE_USING_TWO_PARAM_sched_setaffinity
[EMAIL PROTECTED] src]$
This looks like a possibility for the source of my problem or not?
Can I make my own call to sched_setaffinity? There is, of course,
always the possibility of causing problems.
Ralph
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37586
