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Date: Tue, 15 May 2012 22:01:17 +0800
From: myrice <qqlddg@...il.com>
To: john-dev@...ts.openwall.com
Subject: Long Password Length Status

Hi, all

Here is my experiment with different length on xsha512-cuda format.
THREADS: 512 BLOCKS: 1024
Length	Many Salts(K c/s)	One Salt(K c/s)
8	66584	30098
16	65925	28086
32	64023	22937
64	60531	17476
96	56909	13107
120	52844	13107
Chart: http://myrice.me/gsoc/xsha512_pass.png

When password length large than 32, the performance decreases
4000k(~%6) per every +32.

On my GeForce 9600M GS, I set THREAD to 512/4 BLOCKS to 1024*4, the
data size transferred between CPU and GPU should be same.
Length = 12
Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE
Many salts:	1379K c/s real, 1379K c/s virtual
Only one salt:	1248K c/s real, 1258K c/s virtual

Length = 120
Benchmarking: Mac OS X 10.7+ salted SHA-512 [CUDA]... DONE
Many salts:	1344K c/s real, 1344K c/s virtual
Only one salt:	1156K c/s real, 1173K c/s virtual

~%2.5 slow down.

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