Date: Sat, 19 Nov 2011 16:29:12 -0500 From: Stephen Reese <rsreese@...il.com> To: john-users@...ts.openwall.com Subject: OpenMP not using all threads I have patched john-1.7.8.tar.gz with john-1.7.8-omp-des-7.diff.gz in order to utilize four threads from a E5520 on a Debian system but it instead seem like it is only using two. When testing DES I see around 2500K c/s and when patched about 5000K. I was hoping for closer to 8000K to 10000K. Here is the cpuinfo: flags : fpu de tsc msr pae cx8 cmov pat clflush mmx fxsr sse sse2 ss ht nx constant_tsc nonstop_tsc pni ssse3 sse4_1 sse4_2 popcnt hypervisor To ensure gcc (Debian 4.4.5-8) is working as intended the following was tested and 4 threads are returned. https://en.wikipedia.org/wiki/OpenMP#C I also edited the Makefile as follows: # gcc with OpenMP OMPFLAGS = -fopenmp -msse2 Another strangeness is when testing is I am not seeing the -16 appending to the following: Benchmarking: Traditional DES [128/128 BS SSE2]... DONE Is this normal or did something go wrong.
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