RE: MinGW gfortran and OpenMP issues...
Hi, I'm still having problems with OpenMP and the x86_64 MinGW compilers - code which can run fine on Linux with any number of threads (mapped to different cores) still will only use one core on an i5 quad core windows box. Is this a windows limitation or a compiler one? Compile with: x86_64-w64-mingw32-gfortran.exe -o a.exe -mno-cygwin -static -O3 -fopenmp -cpp -Domp $(SOURCES) -L/home/Nick/lib/ -llapack -lblas Nick -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: MinGW gfortran and OpenMP issues...
On 2/1/2012 7:03 PM, Nick Chilton wrote: Hi, I'm still having problems with OpenMP and the x86_64 MinGW compilers - code which can run fine on Linux with any number of threads (mapped to different cores) still will only use one core on an i5 quad core windows box. Is this a windows limitation or a compiler one? Compile with: x86_64-w64-mingw32-gfortran.exe -o a.exe -mno-cygwin -static -O3 -fopenmp -cpp -Domp $(SOURCES) -L/home/Nick/lib/ -llapack -lblas According to my understanding, mingw compiler versions aren't supported on this list, notwithstanding that cygwin install is probably the best way to get them. However, that compiler gives me good OpenMP performance on 6 of 10 test cases, running on an early core I7 with HyperThread disabled, Win7SP1. GOMP_AFFINITY setting as well as avoiding Hyper-Threading are likely more important on Windows than linux. Win7SP1 is particularly important when using Hyper-Threading. -- Tim Prince -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: MinGW gfortran and OpenMP issues...
Andrey, I have done this, but no difference. I copied the pthreadGC2.dll from the appropriate MinGW lib in cygwin to the folder and it runs fine! There is another problem however. While the program says it is running with 3 threads, it only runs using 25% cpu, spread over 3 cores (Core i5, quad core) (when I say spread, it's not constant, it seems to jump about over the cores 0, 1 and 2) . This occurs when I run from cmd or cygwin. Interstingly, the same behaviour is observed when I only run it with one thread. The same code compiled with ifort on linux runs great with the same input on 3 threads using 3 cores (i.e. 300% cpu) or 1 core if I choose. Is there a way to flex all cores on a windows box with OpenMP?? Nick -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
MinGW gfortran and OpenMP issues...
Hi, I'm trying to compile some code with: x86_64-w64-mingw32-gfortran.exe -o a.exe -mno-cygwin -static -O3 -cpp -Domp -fopenmp $(SOURCES) -L/lib/ -llapack -lblas which compiles fine, but upon execution: a.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory cygcheck shows it has no dependencies, but it seems to be looking for something. Code compiles and runs fine when the OMP sections and -fopenmp flag are removed (sequential) and compiles fine with OpenMP on Linux using ifort. Any ideas what I'm missing? Cheers! Nick -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
RE: MinGW gfortran and OpenMP issues...
Do you have the following directory on your PATH? /usr/x86_64-w64-mingw32/sys-root/mingw/bin -Original Message- From: cygwin-ow...@cygwin.com [mailto:cygwin-ow...@cygwin.com] On Behalf Of Nick Chilton Sent: Thursday, 12 January 2012 17:35 To: cygwin@cygwin.com Subject: MinGW gfortran and OpenMP issues... Hi, I'm trying to compile some code with: x86_64-w64-mingw32-gfortran.exe -o a.exe -mno-cygwin -static -O3 -cpp -Domp -fopenmp $(SOURCES) -L/lib/ -llapack -lblas which compiles fine, but upon execution: a.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory cygcheck shows it has no dependencies, but it seems to be looking for something. Code compiles and runs fine when the OMP sections and -fopenmp flag are removed (sequential) and compiles fine with OpenMP on Linux using ifort. Any ideas what I'm missing? Cheers! Nick -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple -- Please consider the environment before printing this email. NIWA is the trading name of the National Institute of Water Atmospheric Research Ltd. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
RE: MinGW gfortran and OpenMP issues...
While I thought the extra PATH dir solved the problem, it only runs within cygwin. Running in cmd, it says pthreadGC2.dll is missing. Just slapping one from google in there, I get an 0xc07b exception... Nick -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: MinGW gfortran and OpenMP issues...
Greetings, Nick Chilton! While I thought the extra PATH dir solved the problem, it only runs within cygwin. Running in cmd, it says pthreadGC2.dll is missing. Just slapping one from google in there, I get an 0xc07b exception... Make your user PATH equal to what you see in Cygwin terminal. -- WBR, Andrey Repin (anrdae...@freemail.ru) 12.01.2012, 11:16 Sorry for my terrible english... -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
