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Message-ID: <20170814171738.GA2239@openwall.com>
Date: Mon, 14 Aug 2017 19:17:38 +0200
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: JtR job with Tesla K80 Nvidia cards not showing status of all devices
On Sun, Aug 13, 2017 at 11:06:58PM +0200, Luis Rocha wrote:
> Trying last JtR version from git with couple of Tesla K80 Nvidia cards and
> for some unknown reason to me, when I try to check the status of the job ,
> it only prints the status of 1 device where I think it should print the
> status of all the devices, right? Is this a cosmetic issue or something
> else?
In your case, this is a bug - as far as I can tell from what you posted,
JtR was only using 1 GPU, and I've just reproduced what looks like the
same problem. (To better debug issues like this in the future, please
include the output of "nvidia-smi" or "aticonfig --adapter=all --odgc
--odgt", as appropriate, obtained while JtR is running.)
Please try this:
git revert -n 0168a45a145d3c3ff714dd9f6bf73128f5408bac
Does it help? (It did here, and I think magnum is to investigate what's
wrong with that commit and fix it. Thanks.)
> $ ./john /tmp/hash --format=salted-sha1-opencl --fork=2
> Using default input encoding: UTF-8
> Loaded 1 password hash (salted-sha1-opencl [SHA1 OpenCL])
FWIW, there's no point in using a GPU for a run like this, except for
testing. You'll achieve better speeds on CPU. To use a GPU on a fast
hash efficiently, you need "--mask" (for formats where we do support
on-GPU mask, including this one), perhaps along with another cracking
mode (if so, you may refer to the other mode's input as "?w" in the
mask) or/and many salts (for hash types that are fast yet salted, like
this one). I guess you knew that, but thought I'd point it out anyway.
> 1 0g 0:00:01:42 3/3 0g/s 38119Kp/s 38119Kc/s 38119KC/s rummbi7..rtbasaw
These speeds are on par with one CPU core (not even one CPU).
Alexander
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