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Date: Thu, 20 Aug 2015 23:29:08 +0200
From: Agnieszka Bielec <bielecagnieszka8@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: Argon2 on GPU
2015-08-20 23:03 GMT+02:00 Solar Designer <solar@...nwall.com>:
> On Thu, Aug 20, 2015 at 10:40:16PM +0200, Agnieszka Bielec wrote:
>> 2015-08-20 22:34 GMT+02:00 Solar Designer <solar@...nwall.com>:
>> > On Thu, Aug 20, 2015 at 08:04:20PM +0200, Agnieszka Bielec wrote:
>> >> 2015-08-19 18:39 GMT+02:00 Solar Designer <solar@...nwall.com>:
>> >> > I think you may try working on ulong16 or ulong8 instead. I expect
>> >> > ulong8 to match the current GPU hardware best, but OTOH ulong16 makes
>> >> > more parallelism apparent to the OpenCL compiler and allocates it to one
>> >> > work-item. So please try both and see which works best.
>> >>
>> >> I created something using ulong8, it's almost not noticeable better
>> >> speed in my laptop but worse on super both cards, no idea if this is
>> >> what you wanted ( I think that not ), you can take a look on branch
>> >> vector8
>>
>> > You should also
>> > use the wider vector type for the global memory references and in the
>> > kernel parameter list.
>>
>> was even more slower (on super, both cards)
>
> Where is the code? Slower now doesn't necessarily mean we're doing
> anything wrong - it might also mean we're not doing enough of it yet.
deleted, it wasn't much of effort anyway
>
> And how much slower was it? Did you try re-tuning LWS and GWS?
nope
vector8
[a@...er run]$ GWS=1024 ./john --test --format=argon2d-opencl
Benchmarking: argon2d-opencl [Blake2 OpenCL]...
memory per hash : 1.50 MB
Device 0: Tahiti [AMD Radeon HD 7900 Series]
using different password for benchmarking
DONE
Speed for cost 1 (t) of 1, cost 2 (m) of 1536, cost 3 (l) of 1
Many salts: 2061 c/s real, 307200 c/s virtual
Only one salt: 2104 c/s real, 307200 c/s virtual
[a@...er run]$ GWS=1024 ./john --test --format=argon2d-opencl --dev=5
Benchmarking: argon2d-opencl [Blake2 OpenCL]...
memory per hash : 1.50 MB
Device 5: GeForce GTX TITAN
using different password for benchmarking
DONE
Speed for cost 1 (t) of 1, cost 2 (m) of 1536, cost 3 (l) of 1
Many salts: 4970 c/s real, 5019 c/s virtual
Only one salt: 5019 c/s real, 4970 c/s virtual
vector8 + ulong8 for copying and xoring
[a@...er run]$ GWS=1024 ./john --test --format=argon2d-opencl
Benchmarking: argon2d-opencl [Blake2 OpenCL]...
memory per hash : 1.50 MB
Device 0: Tahiti [AMD Radeon HD 7900 Series]
using different password for benchmarking
DONE
Speed for cost 1 (t) of 1, cost 2 (m) of 1536, cost 3 (l) of 1
Many salts: 1563 c/s real, 102400 c/s virtual
Only one salt: 1563 c/s real, 204800 c/s virtual
[a@...er run]$ GWS=1024 ./john --test --format=argon2d-opencl --dev=5
Benchmarking: argon2d-opencl [Blake2 OpenCL]...
memory per hash : 1.50 MB
Device 5: GeForce GTX TITAN
using different password for benchmarking
DONE
Speed for cost 1 (t) of 1, cost 2 (m) of 1536, cost 3 (l) of 1
Many salts: 4970 c/s real, 4923 c/s virtual
Only one salt: 4923 c/s real, 4970 c/s virtual
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