Hi In a cluster, there is a frontend and some compute nodes with the following CPU specs: Frontend: cpu family : 21 model : 2 model name : AMD Opteron(tm) Processor 6380 stepping : 0 GCC: 4.4.7 Computes: cpu family : 21 model : 1 model name : AMD Opteron(tm) Processor 6282 SE stepping : 2 GCC: 4.4.6 Specifically, the 6380 has the following flags while 6282 doesn't have them fma, f16c, tch, tce, tbm and bmi1 Problem is that, I have compiled OpenMPI and another program (which is written in Fortran) on the frontend. When issue the run via MPI, the compute node fails with an illegal instruction -------------------------------------------------------------------------- mpirun noticed that process rank 0 with PID 5383 on node compute-0-1 exited on signal 4 (Illegal instruction). -------------------------------------------------------------------------- I have compiled OMPI and the application with -march=amdfam10 on the frontend. A snippet of the program looks like /export/apps/siesta/openmpi-2.0.0/bin/mpifort -c -g -Os -march=amdfam10 `FoX/FoX-config --fcflags` -DMPI -DFC_HAVE_FLUSH -DFC_HAVE_ABORT -DTRANSIESTA /export/apps/siesta/siesta-4.0/Src/pspltm1.F The question is, how can I find the name of that illegal instruction? With that I can find which flag is missing. Regards, Mahmood
