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Date: Fri, 14 Aug 2015 18:20:47 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: Argon2 on GPU
On Fri, Aug 14, 2015 at 04:44:09PM +0200, Agnieszka Bielec wrote:
> wtf?
>
> [a@...er run]$ ./john --test --format=argon2i-opencl
> Benchmarking: argon2i-opencl [Blake2 OpenCL]...
> memory per hash : 1.46 MB
> Device 0: Tahiti [AMD Radeon HD 7900 Series]
> using different password for benchmarking
> DONE
> Speed for cost 1 (t) of 3, cost 2 (m) of 1500, cost 3 (l) of 1
> Many salts: 423 c/s real, 102400 c/s virtual
> Only one salt: 423 c/s real, 102400 c/s virtual
>
> [a@...er run]$ ./john --test --format=argon2i-opencl --v=4
> Benchmarking: argon2i-opencl [Blake2 OpenCL]...
> memory per hash : 1.46 MB
> Device 0: Tahiti [AMD Radeon HD 7900 Series]
> Calculating best global worksize (GWS); max. 1s single kernel invocation.
> gws: 256 387 c/s 387 rounds/s 659.830ms per crypt_all()!
> gws: 512 720 c/s 720 rounds/s 710.817ms per crypt_all()+
> gws: 1024 1305 c/s 1305 rounds/s 784.470ms per crypt_all()+
> Local worksize (LWS) 64, global worksize (GWS) 1024
> using different password for benchmarking
> DONE
> Speed for cost 1 (t) of 3, cost 2 (m) of 1500, cost 3 (l) of 1
> Many salts: 389 c/s real, 102400 c/s virtual
> Only one salt: 386 c/s real, 51200 c/s virtual
>
> [a@...er run]$ GWS=1024 ./john --test --format=argon2i-opencl --v=4
> Benchmarking: argon2i-opencl [Blake2 OpenCL]...
> memory per hash : 1.46 MB
> Device 0: Tahiti [AMD Radeon HD 7900 Series]
> Local worksize (LWS) 64, global worksize (GWS) 1024
> using different password for benchmarking
> DONE
> Speed for cost 1 (t) of 3, cost 2 (m) of 1500, cost 3 (l) of 1
> Many salts: 1296 c/s real, 204800 c/s virtual
> Only one salt: 1304 c/s real, 204800 c/s virtual
So the reported auto-tuned GWS works differently from manually set one?
You certainly need to figure this out.
And just as important: figure out why the speeds are so poor, compared
to what you're getting on your laptop, as well as to what you had
reported earlier (IIRC).
> this can have something common with MEM_SIZE/4 (now I have removed /4)
When did you remove the /4? Before or after running the test above?
> http://www.openwall.com/lists/john-dev/2015/08/06/22
> sorry, couldn't find my original e-mail
Alexander
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