Date: Mon, 31 Aug 2015 14:15:51 +0300 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: PHC: Argon2 on GPU On Mon, Aug 31, 2015 at 10:26:43AM +0300, Solar Designer wrote: > On Sun, Aug 30, 2015 at 11:56:32PM +0200, Agnieszka Bielec wrote: > > I just discovered that argon2d which uses coalescing is faster on both > > TITAN, it's slower with coalescing on my 960m so I didn't tested this > > on super. I should. I was trying many things for some period of time > > but these changes in results are from that we tested argon more > > carefully. to turn on coalescing in argon2d it's only needed to change > > 4 lines but I will make #define USE_COALESCING 0/1 very soon > > It's unexpected that coalescing for Argon2d is of so much help. I realized that coalescing may in fact help speedup Argon2d at low t like that because, while its lookups are random, its initial writes are sequential - and at low t these are a large fraction of all accesses. > Please > confirm these speeds by actual cracking, with a wordlist containing no > duplicate lines. I've just confirmed this: [solar@...er run]$ cat>pw $argon2d$1$1536$1$damage_done$EE74C39511A1D4C4F71FD17966A1CE1F6D3E1B4E93438636EFEEC9696AD27A6C [solar@...er run]$ LWS=48 GWS=2304 ./john -format=argon2d-opencl -dev=5 -inc -min-len=8 -max-len=8 pw Using default input encoding: UTF-8 Loaded 1 password hash (argon2d-opencl [Blake2 OpenCL]) memory per hash : 1.50 MB Device 5: GeForce GTX TITAN Press 'q' or Ctrl-C to abort, almost any other key for status 0g 0:00:00:03 0g/s 9005p/s 9005c/s 9005C/s GPU:42б╟C util:99% fan:31% babygirl..bashouri 0g 0:00:03:02 0g/s 9559p/s 9559c/s 9559C/s GPU:63б╟C util:99% fan:39% mouggy12..medertya BTW, per nvidia-smi it consumes 177W and 3791MiB. Alexander
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