------- Comment #6 from rrpeter at sandia dot gov 2008-09-30 15:54 ------- Subject: Re: OpenMP thinks that I have 1 processor on an 8 processor pc
jakub at gcc dot gnu dot org wrote: > ------- Comment #5 from jakub at gcc dot gnu dot org 2008-09-20 08:22 ------- > No, I didn't mean to ask you to try to work around it, I asked you to > investigate why omp_get_num_procs returns 1 instead of 8. The gcc 4.3 vs. 4.4 > difference only affects omp_get_max_threads, not omp_get_num_procs, so even > omp_get_num_procs reports 1, the options are 1) the process has affinity set > to > just one CPU 2) GOMP_CPU_AFFINITY has been used 3) you have omp_get_num_procs > defined elsewhere in your program, verify that libgomp function is really > used. > strace -f -e sched_getaffinity dump of the program could reveal 1), 2) can be > determined by looking at the scripts you use to start the program (or by > adding > getenv call in the program to print that for you), 3) can be seen in the > debugger and/or by using LD_DEBUG=all env var. > > > -- > > > 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 finally have a bit of time respond to your last email! I may be new enough to this to be missing something important. Why don't we start at the beginning? I compiled everything with -fopenmp flag on the compiler (4.3.2 is the version for g++ and gcc) ***************************************** Openmp code exists in only one place in my software. [EMAIL PROTECTED] rwm]$ find . -name "*.*pp" -exec grep -n -H omp.h {} \; ./umbraModCDF/umbModCDFDataSet.cpp:237:#include <omp.h> [EMAIL PROTECTED] rwm]$ find . -name "*.*pp" -exec grep -n -H omp_get_num_procs {} \; ./umbraModCDF/umbModCDFDataSet.cpp:246: cerr << " OPENMP is " << _OPENMP << " Number of processors available:" << omp_get_num_procs() << " MAX number of OpenMP threads " << omp_get_max_threads() << endl; [EMAIL PROTECTED] rwm]$ All of the OpenMP code that I have is in the following function ********************************** #include <omp.h> void test_openmp() { cerr << "\nEnter test_openmp() " << endl; #ifdef _OPENMP // omp_set_dynamic(true); // omp_set_num_threads(8); cerr << " OPENMP is " << _OPENMP << " Number of processors available:" << omp_get_num_procs() << " MAX number of OpenMP threads " << omp_get_max_threads() << endl; char *GCU = getenv("GOMP_CPU_AFFINITY"); if(GCU != NULL) cerr << " GOMP_CPU_AFFINITY is " << GCU << "!!!!\n"<< endl; else cerr << " GOMP_CPU_AFFINITY is unknown" << endl; #endif cerr << "\nExit test_openmp()\n" << endl; cerr.flush(); } *********** Output snippet is: Enter test_openmp() OPENMP is 200505 Number of processors available:1 MAX number of OpenMP threads 1 GOMP_CPU_AFFINITY is unknown Exit test_openmp() ************ I ran strace and I got some results. In the output I see: 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 I will let you interpret the output which is reproduce in full below. [EMAIL PROTECTED] rwm]$ strace -f -e sched_getaffinity uview ./viewer_scripts/viewer_CDF.tcl Process 3503 attached (waiting for parent) Process 3503 resumed (parent 3502 ready) Process 3503 detached --- SIGCHLD (Child exited) @ 0 (0) --- provided packge "ucl" version 4.7.1 STATUS> Umbra installed at UmbraPath -> /home/hopper/UMBRA_4 STATUS> Use UmbraPath variable to refer to this location STATUS> uview is using gui from developerViewer STATUS> loading umbraConfig.tcl from uclLoad.tcl STATUS> searching for umbra config files in path /home/hopper/UMBRA_4/umbra/SNL/rwm . /home/hopper/UMBRA_4 library r {umb {4.7.1 debug {Sep 29 2008} 13:08:47}} {usg {4.7.1 debug {Sep 29 2008} 13:08:56}} {ucl {4.7.1 debug {Sep 29 2008} 13:08:55}} STATUS> loading ustk library from uclLoad.tcl *-----------------------------------------------------------------------------* * The C-Space Toolkit (C) software contained in this program is the * * property of Sandia Corporation. * * Copyright 1995-2003 (C) Sandia Corporation. All rights reserved. * * * * The C-Space Toolkit (``CSTk'') was developed at Sandia National * * Laboratories, which is operated by the Sandia Corporation under contract * * for the United States Department of Energy. The CSTk is is protected by * * copyright under the laws of the United States. CSTk software is not to * * be used, disclosed, or duplicated without explicit written authorization * * from Sandia Corporation. * *-----------------------------------------------------------------------------* STATUS> loading general.tcl from umbra/core/ucl directory STATUS> loading iTclUtilities.tcl from umbra/core/ucl directory STATUS> loading monitor.tcl from umbra/core/ucl directory STATUS> loading XmlSaxParserCore.tcl from umbra/core/ucl directory STATUS> loading XmlUtils.tcl from umbra/core/ucl directory STATUS> loading umbTime.tcl from from umbra/core/ucl directory STATUS> Time Modules simClock & wallClock built STATUS> loading tkconUmb.tcl from uclLoad.tcl loading tkconUmb.tcl ... modified version of tkcon.tcl for umbra STATUS> loading umbraConsole.tcl from uclLoad.tcl STATUS> loading mkConsoleUmb.tcl from uclLoad.tcl STATUS> Making the umbra console and a usg::Scene scene STATUS> All tcl output will now go to umbra console STATUS> Only cout/cerr from C++ will go to this window -------------------------------------------------------------------------------- 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_getaffinity(3502, 128, { ff, 0, 0, 0 }) = 32 INFO> navigation mode set to umbra Warning: font file "fonts/arial.ttf" not found. Setting savConfigCB to '::guiWrapper saveConfig' sched_getaffinity(3502, 128, { 1, 0, 0, 0 }) = 32 sLoadFile filename:/home/vision_data/geometry_objects/test.cdf fileType: lineRowCnt=-1 lineColCnt=-1 std::string UmbModCDFDataSet::LoadFile(const s.... Enter test_openmp() sched_getaffinity(3502, 128, { 1, 0, 0, 0 }) = 32 OPENMP is 200505 Number of processors available:1 MAX number of OpenMP threads 1 GOMP_CPU_AFFINITY is unknown Exit test_openmp() After test_openmp() Processing CDF File: /home/vision_data/geometry_objects/test.cdf M(9): Start of CDF Version 1.0 stream M(1292): End of CDF Version 1.0 stream Entering UmbModCutCDFDataSet::_CutData(...) cdf_cut Acummulator replacing data. New CDF contains 469 points. No texturing as there are no images Plotting data for 469 points and 466 polygons. entering CDFDataSet::plotData Shape:0 / 13 NumberPoints =8 NumberPolygns=12 NumberLineSegments=0 Shape:1 / 13 NumberPoints =8 NumberPolygns=12 NumberLineSegments=0 Shape:2 / 13 NumberPoints =8 NumberPolygns=12 NumberLineSegments=0 Shape:3 / 13 NumberPoints =62 NumberPolygns=120 NumberLineSegments=0 Shape:4 / 13 NumberPoints =62 NumberPolygns=120 NumberLineSegments=0 Shape:5 / 13 NumberPoints =14 NumberPolygns=24 NumberLineSegments=0 Shape:6 / 13 NumberPoints =14 NumberPolygns=24 NumberLineSegments=0 Shape:7 / 13 NumberPoints =12 NumberPolygns=20 NumberLineSegments=0 Shape:8 / 13 NumberPoints =62 NumberPolygns=120 NumberLineSegments=0 Shape:9 / 13 NumberPoints =4 NumberPolygns=2 NumberLineSegments=0 Shape:10 / 13 NumberPoints =112 NumberPolygns=0 NumberLineSegments=0 Shape:11 / 13 NumberPoints =60 NumberPolygns=0 NumberLineSegments=0 Shape:12 / 13 NumberPoints =36 NumberPolygns=0 NumberLineSegments=0 Shape:13 / 13 NumberPoints =7 NumberPolygns=0 NumberLineSegments=6 exiting CDFDataSet::plotData DEBUG: Trying to exit. DEBUG: main loop all done... bye. End-of-run CumTimer timing results Number of entries: 2 Total run time: 2.62966 secs Id:cdf_cutUmbModCutCDFDataSet::_CutData(): TotalTime:6.91414e-06 Frac:2.62929e-06 Count:1 Id:cdf_rot_tr_sclRotateTranslateScaleData() TotalTime:6.50883e-05 Frac:2.47516e-05 Count:1 BasicDrawParmsGuarantor::cleanup() cstk::ilWin::finalCleanup() Cleaning up known windows. DistEngine::DeleteDfltInst() called. [EMAIL PROTECTED] rwm]$ *************************************** I hope this helps to find the problem! Please email me with further questions as they arise, Ralph -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37586
