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Date: Mon, 31 Aug 2015 10:35:01 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: Argon2 on GPU

Agnieszka,

On Mon, Aug 31, 2015 at 10:26:43AM +0300, Solar Designer wrote:
> Looks like we need a script to test many LWS/GWS combinations.  I am
> running a simple script (testing 128 combinations) against Argon2d on
> TITAN X now (and we'll probably need to test many more once we have
> improved the code some further, since the current code is obviously
> still far from optimized and thus might not be worth a lot of tuning and
> benchmarking effort).

No luck improving upon your TITAN X result in this way yet, but I'll
post what was tried anyway.

I ran this script:

[solar@...er run]$ cat try.sh 
#!/bin/sh

for LWS in `seq 1 128`; do
        GWS=$[$LWS * 24]
        while [ $GWS -lt 1536 ]; do
                GWS=$[$GWS * 2]
        done
        echo $LWS $GWS
        export LWS GWS
        ./john -test -format=argon2d-opencl -dev=4 -v=4
done

like this:

[solar@...er run]$ ./try.sh | tee -a try4.log

Then analyzed the log like this:

[solar@...er run]$ fgrep Many try4.log | sort -k3 -rn | head
Many salts:     8045 c/s real, 7969 c/s virtual
Many salts:     7831 c/s real, 7763 c/s virtual
Many salts:     7747 c/s real, 7680 c/s virtual
Many salts:     7733 c/s real, 7733 c/s virtual
Many salts:     7714 c/s real, 7714 c/s virtual
Many salts:     7712 c/s real, 7779 c/s virtual
Many salts:     7698 c/s real, 7698 c/s virtual
Many salts:     7680 c/s real, 7680 c/s virtual
Many salts:     7663 c/s real, 7663 c/s virtual
Many salts:     7663 c/s real, 7596 c/s virtual

The top two entries are:

[solar@...er run]$ grep -B6 'Many .*8045' try4.log 
88 2112
Benchmarking: argon2d-opencl [Blake2 OpenCL]... 
memory per hash : 1.50 MB
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:     8045 c/s real, 7969 c/s virtual
[solar@...er run]$ grep -B6 'Many .*7831' try4.log 
93 2232
Benchmarking: argon2d-opencl [Blake2 OpenCL]... 
memory per hash : 1.50 MB
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:     7831 c/s real, 7763 c/s virtual

The next few are for nearby LWS values as well.

Alexander

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