Although the CPUs are nearly the same, but the CPU flags are different. I noticed that the frontend has fma, f16c, tch, tce, tbm and bmi1 while the compute nodes don't have them.
I guess that since the programs were compiled on the frontend (6380), there are some especial instructions in the optimization phase which aren't available in compute nodes (6282). Maybe this is not really related to OMPI, but anybody know which compiler flags are related to these special instructions? >Ok, you can try this under gdb >info proc mapping >info registers >x /100x $rip >x /100x $eip The process is dead, so some commands are invalid. Program terminated with signal 4, Illegal instruction. #0 0x00000000008da76e in ?? () (gdb) info proc mapping No /proc directory: '/proc/5383' (gdb) info registers rax 0x0 0 rbx 0x448f980 71891328 rcx 0x7fff52810b00 140734577576704 rdx 0x448f980 71891328 rsi 0x448f980 71891328 rdi 0x8 8 rbp 0x448f980 0x448f980 rsp 0x7fff52810ae8 0x7fff52810ae8 r8 0x1 1 r9 0x9c0 2496 r10 0x44af480 72021120 r11 0x44b1b80 72031104 r12 0x8 8 r13 0x8 8 r14 0x9 9 r15 0x13880 80000 rip 0x8da76e 0x8da76e eflags 0x10246 [ PF ZF IF RF ] cs 0x33 51 ss 0x2b 43 ds 0x0 0 es 0x0 0 fs 0x0 0 gs 0x0 0 (gdb) x /100x $rip 0x8da76e: Cannot access memory at address 0x8da76e (gdb) x /100x $eip Value can't be converted to integer. (gdb) Regards, Mahmood
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