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Date: Sat, 27 Jul 2013 19:20:07 +0400
From: Solar Designer <>
Subject: Re: phpass-opencl experiments

Lukas -

On Sat, Jul 27, 2013 at 10:13:43AM +0200, Lukas Odzioba wrote:
> Just to let you know.
> I played for a while with phpass-opencl code here are my remarks.


> After I changed KPC to 2048*1024

So we need auto-tuning.

> After applying attached patch:

So we need to commit it.

> Speed of my old code with hash comparision on gpu side with hash
> "embedded" in salt, is 2125K on amd (nv - not tested).

Why didn't you commit this?  Is it because it wouldn't handle multiple
hashes sharing a salt value (this is how I read your description above)?

> I'll try to implement those changes after cmiyc,

Shouldn't we at least get your attached patch in before CMIYC?

> now I want to play with md5crypt, because we could gain more there.


Thanks again,


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