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Date: Thu, 19 May 2016 11:13:00 +0200
From: Doc Case <>
To: "" <>
Subject: Re: MultiGPU support in Magnum?

Thank you Magnum.

It was pretty straight-forward, my fault not to check on docs... Anyhow, something is still not right. This is the output I get, seems that a seg-fault happen on dev0, and fall back using just a single GPU...

./john -fork=2 -dev=gpu,acc -format=dmg-opencl ~/Downloads/hash.txt 

Using default input encoding: UTF-8

Loaded 1 password hash (dmg-opencl, Apple DMG [PBKDF2-SHA1 OpenCL 3DES/AES])

Will run 4 OpenMP threads per process (8 total across 2 processes)

Node numbers 1-2 of 2 (fork)

Device 0: GeForce GTX 970

[Tappo:03548] *** Process received signal ***

[Tappo:03548] Signal: Segmentation fault (11)

[Tappo:03548] Signal code:  (128)

[Tappo:03548] Failing at address: (nil)

[Tappo:03548] [ 0] /lib/x86_64-linux-gnu/[0x7fab600943d0]

[Tappo:03548] [ 1] /usr/lib/x86_64-linux-gnu/[0x7fab547169dc]

[Tappo:03548] [ 2] /usr/lib/x86_64-linux-gnu/[0x7fab54716e95]

[Tappo:03548] [ 3] /usr/lib/x86_64-linux-gnu/[0x7fab547170e5]

[Tappo:03548] [ 4] /usr/lib/x86_64-linux-gnu/[0x7fab542afe30]

[Tappo:03548] [ 5] /usr/lib/x86_64-linux-gnu/[0x7fab542b06e2]

[Tappo:03548] [ 6] /usr/lib/x86_64-linux-gnu/[0x7fab542baf6a]

[Tappo:03548] [ 7] /usr/lib/x86_64-linux-gnu/[0x7fab542bb38a]

[Tappo:03548] [ 8] /usr/lib/x86_64-linux-gnu/[0x7fab54722e45]

[Tappo:03548] [ 9] /usr/lib/x86_64-linux-gnu/[0x7fab54723578]

[Tappo:03548] [10] /usr/lib/x86_64-linux-gnu/[0x7fab54723cbe]

[Tappo:03548] [11] /usr/lib/x86_64-linux-gnu/[0x7fab541a08a9]

[Tappo:03548] [12] /usr/lib/x86_64-linux-gnu/[0x7fab541a1429]

[Tappo:03548] [13] /usr/lib/x86_64-linux-gnu/[0x7fab53f14355]

[Tappo:03548] [14] /usr/lib/x86_64-linux-gnu/[0x7fab53f1347d]

[Tappo:03548] [15] ./john[0x73c04c]

[Tappo:03548] [16] ./john[0x73da8c]

[Tappo:03548] [17] ./john[0x6ea10a]

[Tappo:03548] [18] ./john[0x6f2355]

[Tappo:03548] [19] ./john[0x6f3f78]

[Tappo:03548] [20] ./john[0x6f42e6]

[Tappo:03548] [21] ./john[0x6f5239]

[Tappo:03548] [22] /lib/x86_64-linux-gnu/[0x7fab5fcda830]

[Tappo:03548] [23] ./john[0x407c39]

[Tappo:03548] *** End of error message ***

Sent using Zoho Mail

---- On Thu, 19 May 2016 10:37:25 +0200 magnum &lt;;wrote ---- 

On 2016-05-19 02:06, Doc Case wrote: 

&gt; Hi to everyone, 

&gt; I think i'm missing something... I have 2 GPUs in my system, a couple of GeForce GTX970 and I've built from bleeding john with support for openCL, cuda and OpenMPI. 

&gt; I'm tryng to crack a SHA1 3DES/AES, but john works only with one GPU. 

&gt; In nvidia-settings i can see the temperature rising just on one of the two cards... any suggestion on what i'm missing? I need to use two different session, one for each card? if so, can you point some instructions to do so? 

doc/README-OPENCL, section "Multi-device support". 


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