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Message-ID: <20150825052654.GA30887@openwall.com>
Date: Tue, 25 Aug 2015 08:26:54 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: -dev=... -fork=... wastes GPU memory
magnum,
Running this command on super:
./john -form=md5crypt-opencl 6.md5crypt.pw -fork=3 -dev=0,1,5 -mask='?l?l?l?l?l?l?l?l'
I get this in nvidia-smi output:
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 17041 C ./john 68MiB |
| 0 17042 C ./john 68MiB |
| 0 17043 C ./john 106MiB |
+-----------------------------------------------------------------------------+
It looks like the two child processes that target other GPUs nevertheless
consume some memory on this GPU card as well. Why is that, and can we
avoid it?
I guess the same happens for AMD GPUs as well, but we don't have such
nice reporting for them. Recent nvidia-smi is very nice in this respect.
Alexander
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