Hi, I'm experiencing a strange problem with running LIGGGHTS on 48 core workstation running Ubuntu 14.04.4 LTS.
If I cold boot the workstation and start one of the examples form LIGGGHTS then everything looks fine: $ mpirun -np 48 liggghts < in.chute_wear launches the example on all 48 cores, htop in a second window shows that all cores are occupied and run at nearly 100% workload. So far so good. Now I just reboot the workstation and do the exact same steps as abovre. This time the job just runs on a few cores (16 to 20) and the cores don't even run at 100% load. So now I'm trying to find out what is wrong. Bad luck is that I can't just ask the vendor of the workstation since I'm working for that vendor and trying to solve this issue. :-) I guess that something that OpenMPI needs is initialized different when I do a cold boot or a warm boot. But how can I find out what is wrong? Already tried to look for differences in the Ubuntu boot logs, but there is nothing different. ompi_info --all or even the parsable format doesn't show any difference between cold boot and warm boot. Any ideas what could be wrong after the reboot that causes such a behaviour? Thanks, Rainer -- Dipl.-Inf. (FH) Rainer Koenig Project Manager Linux Clients Dept. PDG WPS R&D SW OSE Fujitsu Technology Solutions Bürgermeister-Ullrich-Str. 100 86199 Augsburg Germany Telephone: +49-821-804-3321 Telefax: +49-821-804-2131 Mail: mailto:rainer.koe...@ts.fujitsu.com Internet ts.fujtsu.com Company Details ts.fujitsu.com/imprint.html
