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Date: Sat, 07 Jul 2012 07:47:37 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: RAR's SHA-1 speed on GPU
On 2012-07-07 04:23, Solar Designer wrote:
> magnum -
>
> Do you know how many times the SHA-1 compression function is invoked (on
> average?) per the 256k rounds of the loop in rar_kernel.cl, for the test
> vectors that we're currently using? In other words, how many SHA-1s per
> second do our current c/s rates for RAR translate to? Of course,
> there's lots of other "overhead" besides SHA-1 involved, but I am
> curious nevertheless.
>
> I naively thought that we had SHA-1 on every iteration, but this doesn't
> appear to be the case, or the speed on GTX 570 would be unbelievably
> high (only 8 clock cycles per SHA-1 round, which would be too good given
> the lack of rotates and bit selects on NVIDIA).
An 8-character password results in 7,078,320 bytes of data fed to SHA-1,
that is 110,599 blocks of 64 bytes.
Running RAR with GWS=0 will enable a "benchmark" mode showing sha1 /
second and kernel duration:
$ GWS=0 ../run/john -t -fo:rar
OpenCL platform 0: NVIDIA CUDA, 1 device(s).
Using device 0: GeForce GTX 570
Calculating best keys per crypt (GWS) for LWS=64
Raw GPU speed figures including buffer transfers:
gws 64 87 c/s 8196531 sha1/s 0.730 sec per crypt_all()!
gws 128 175 c/s 16487275 sha1/s 0.730 sec per crypt_all()!
gws 256 319 c/s 30053947 sha1/s 0.800 sec per crypt_all()!
gws 512 639 c/s 60202107 sha1/s 0.800 sec per crypt_all()!
gws 1024 1249 c/s 117672037 sha1/s 0.820 sec per crypt_all()!
gws 2048 2182 c/s 205572766 sha1/s 0.938 sec per crypt_all()!
gws 4096 3374 c/s 317874662 sha1/s 1.214 sec per crypt_all()+
gws 8192 3410 c/s 321266330 sha1/s 2.402 sec per crypt_all()+
gws 16384 3930 c/s 370257090 sha1/s 4.168 sec per crypt_all()+
gws 32768 4385 c/s 413124005 sha1/s 7.472 sec per crypt_all()+
gws 65536 4478 c/s 421885814 sha1/s 14.634 sec per crypt_all()
gws 32832 4391 c/s 413689283 sha1/s 7.476 sec per crypt_all()+
gws 32896 4400 c/s 414537200 sha1/s 7.475 sec per crypt_all()+
gws 32960 4409 c/s 415385117 sha1/s 7.476 sec per crypt_all()+
gws 33024 4415 c/s 415950395 sha1/s 7.478 sec per crypt_all()+
gws 33088 4423 c/s 416704099 sha1/s 7.479 sec per crypt_all()+
gws 33152 4404 c/s 414914052 sha1/s 7.527 sec per crypt_all()
Optimal keys per crypt 33088
(to avoid this test on next run, put "rar_GWS = 33088" in john.conf,
section [Options:OpenCL])
Local worksize (LWS) 64, Global worksize (GWS) 33088
Benchmarking: RAR3 SHA-1 AES (6 characters) [OpenCL]... DONE
Raw: 4417 c/s real, 4420 c/s virtual
magnum
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