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Date: Sat, 09 May 2015 10:55:09 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Adding OpenMP support to SunMD5
On 2015-05-09 05:36, Lei Zhang wrote:
>
>> On May 9, 2015, at 10:00 AM, Solar Designer <solar@...nwall.com> wrote:
>>
>>> [lei@...er src]$ ../run/john --test --format=sunmd5
>>> Will run 32 OpenMP threads
>>> Benchmarking: SunMD5 [MD5 128/128 AVX 4x3]... (32xOMP) DONE
>>> Speed for cost 1 (iteration count) of 5000
>>> Raw: 5907 c/s real, 194 c/s virtual
>>
>> Note that this is only ~11x faster than single-thread speed. It should
>> be ~15x+ faster.
>
> Now I dropped those threadprivate stuffs. The three dynamic arrays are now enlarged to be shared by all threads, and another two static arrays are moved into stack. But the performance doesn't get better:
>
> [lei@...er src]$ ../run/john --test --format=sunmd5
> Will run 32 OpenMP threads
> Benchmarking: SunMD5 [MD5 128/128 AVX 4x3]... (32xOMP) DONE
> Speed for cost 1 (iteration count) of 5000
> Raw: 4954 c/s real, 162 c/s virtual
>
> [lei@...er src]$ OMP_NUM_THREADS=1 ../run/john --test --format=sunmd5
> Warning: OpenMP is disabled; a non-OpenMP build may be faster
> Benchmarking: SunMD5 [MD5 128/128 AVX 4x3]... DONE
> Speed for cost 1 (iteration count) of 5000
> Raw: 528 c/s real, 528 c/s virtual
>
> Hints?
Did you try OMP_SCALE yet? I think you should implement it just like in
most other formats even if you end up with it defined to 1 after testing.
magnum
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