------- Comment #2 from rrpeter at sandia dot gov 2008-09-19 16:59 ------- Subject: Re: OpenMP thinks that I have 1 processor on an 8 processor pc
rguenth at gcc dot gnu dot org wrote: > ------- Comment #1 from rguenth at gcc dot gnu dot org 2008-09-19 14:43 > ------- > "I tried setting the environment variable OMP_NUM_THREADS to 2 and got 2 > threads, but only one processor was running the job." > > this suggests your operating system is limiting your job to one CPU. > > > -- > > rguenth at gcc dot gnu dot org changed: > > What |Removed |Added > ---------------------------------------------------------------------------- > Status|UNCONFIRMED |RESOLVED > Resolution| |INVALID > > > 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, Thanks for the response! If I run the simple sample code, then I get 8 processors and 8 threads while my umbra test case always replys that only 1 processor is available. The umbra test case that I am loading is small with regards to memory used and runs well (if slowly... 30 seconds or so), so it seems odd that the OS thinks that only 1 of 8 processors are available when the system-monitor shows that the remaining 6 or 7 are not being used (< 1%). So there is something strange going on... Either the query to the operating system is providing an invalid answer or the compile is somehow wrong or something!??? What do you think is the root cause of the problem? What does the code making the query do? Where is it? I am quite willing and (probably) able to work with someone to run tests on my computers to try to understand what the root problem is. There are a number of people here at the Intelligent Systems and Robotics Center interested in parallelizing umbra ( http://www.sandia.gov/isrc/UMBRA.html) and I have NO idea why my simple test inside umbra has FAILED. Thanks, Ralph Peters Principal Member of the Technical Staff Intelligent Systems and Robotics Sandia National Laboratories Albuquerque, NM USA -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37586
