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Message-ID: <20120403170119.GA16941@openwall.com>
Date: Tue, 3 Apr 2012 21:01:19 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: fast hashes on GPU
On Wed, Apr 04, 2012 at 12:34:06AM +0800, myrice wrote:
> I already thought of this. The fmt_self_test also calls set_key. It will
> disturb the condition you said. I am thinking that for testing purpose, we
> could set up a flag in bench_set_keys() or comment out fmt_self_test in
> benchmark_format.
This makes sense to me.
> From cuda profiler, I see cuda_cmp_all(My new function, already push to
> github) only occupied 0.5% time.
You're transferring the computed hashes to the host anyway, right?
You'd need to avoid that (postpone it to the time that the first
get_hash*() or cmp_one() call is made - hoping that one won't be made).
Anyway, I've just tried your code on my GTX 570 1600 MHz.
Your original code from github with no changes:
Benchmarking: Mac OS X 10.7+ salted SHA-512 CUDA [64/64]... DONE
Many salts: 22053K c/s real, 22053K c/s virtual
Only one salt: 14818K c/s real, 14818K c/s virtual
sm_10 changed to sm_20:
Many salts: 20072K c/s real, 20193K c/s virtual
Only one salt: 13953K c/s real, 13953K c/s virtual
Hmm, it became slower. More changes:
#define BLOCKS 1024
#define THREADS 480
Many salts: 24192K c/s real, 24382K c/s virtual
Only one salt: 17146K c/s real, 17146K c/s virtual
Back to sm_10 (but keeping the BLOCKS and THREADS change):
Many salts: 27162K c/s real, 26926K c/s virtual
Only one salt: 18432K c/s real, 18432K c/s virtual
BINARY_SIZE reduced to 8 (and other related changes):
Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE
Many salts: 52019K c/s real, 52019K c/s virtual
Only one salt: 27403K c/s real, 27403K c/s virtual
This is starting to look a lot better.
I've attached the patch - please review and likely apply.
Alexander
View attachment "xsha512-cuda.diff" of type "text/plain" (3469 bytes)
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