Date: Tue, 17 Mar 2015 17:22:31 +0100 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: [GSoC] building JtR for MIC On 2015-03-17 10:38, Lei Zhang wrote: > I reran the benchmarks on MIC, with or without OpenMP, and got some statistics. > > *With OpenMP:* > The result is a bit different from last time. The program didn't get killed when > running /mschapv2-naive/, but aborted later when running /mysql/, with error > message: *****mem_alloc(): Cannot allocate memory trying to allocate 5190451200 > bytes***** Wow that's pretty heavy for a single allocation. Note the following lines in mysql_fmt_plug.c: #define OMP_SCALE 81920 (...) #define MAX_KEYS_PER_CRYPT 8 This is your problem. You will ending up allocating 81920*8*240*33 bytes for the plaintext buffer (btw the "33" is [PLAINTEXT_LENGTH + 1]). So this OMP_SCALE is obviously not suitable for MIC. Try something like this + #ifdef __MIC__ + #define OMP_SCALE 128 + #else #define OMP_SCALE 81920 + endif Then you may tweak it by doubling it until it doesn't get faster (or just gets silly high). Nearly all OpenMP formats use this exact scheme so you can fix most formats the same way. I'm pretty sure the NETLM* and NETNTLM* formats are just as bad or worse. magnum
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