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Date: Fri, 18 May 2012 21:19:17 +0200
From: magnum <>
Subject: Re: Performance Considerations of stdin

On 05/18/2012 08:31 PM, jfoug wrote:
>> From: Brad Tilley []
>> Basically, I'm wondering if a word generation program that passed words
>> into JTR via stdin would perform better than when JTR is doing both word
>> mangling and hash generation, hash testing, etc all by itself.
>> ehco -n word | john --sdtin
>> Has anyone had experience performance testing something such as this?
> Depends upon the OS.  If it is winblows, then the performance is horrible.
> I get about 30% or so performance for fast hashes, vs a dictionary read into
> memory, with rules run on the dictionary.  Windows has a TINY pipe_buffer.
> I have found no way to speed this up (and I have tried).

Isn't this Windows problem mitigated a little (or a lot) if using --pipe
instead of --stdin? If not, I suppose we could make it to.


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