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Date: Tue, 11 Mar 2014 20:07:13 -0400
From: kzug <kzug10@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: Help needed on CUDA / OpenCL on OS X 10.9
Thanks Magnum,
I'll try all of that and report success or failure.
> If you install a real gcc (which I do recommend for OSX), why not use a much newer version?
As john.conf mentions a llvm-gcc 4.2, I stuck to 4.2 for the reason that I am very good at breaking things, and not so good for fixing them.
On TuesdayMar 11, 2014, at 4:13 PM, magnum wrote:
> On 2014-03-11 18:27, K Zug wrote:
>> CUDA won't compile properly, and OpenCL, even though compiling will either
>> hang, freeze, or return a "Warning: salt() returned misaligned pointer" or
>> gives a "Abort trap: 6" when working on Jeff's DMG.
>> Please note that when benchmarking, the dmg-opencl benchmark correctly.
>
> The misaligned pointer warning is more often than not just a red herring. And on x86 it's no problem anyway, since it can handle unaligned data.
>
> The hang/freeze problems are likely due to the fact this format does not auto-tune and the default GWS of 9216 will hang most GPU's weaker than state-of-the-art, and often takes the whole system down as collateral damage. Export GWS=512 (or so) or add a line in john.conf, section [Options:OpenCL] that says dmg_GWS = 512 (or so).
>
>
>> I tried as far as I could, even installed GCC 4.2 via homebrew to no avail.
>
> If you install a real gcc (which I do recommend for OSX), why not use a much newer version? For best performance, use eg. 4.7 and the -native build target. See bottom section of doc/INSTALL.
>
>
>> I am ready to sacrifice a rooster or wear a necklace of garlic if
>> necessary.
>
> Only a last resort.
>
>
>> $ make clean macosx-x86-64-cuda
>> (...)
>> /usr/bin/llvm-gcc-4.2: No such file or directory
>> make[1]: *** [cuda_common.o] Error 1
>> make: *** [macosx-x86-64-gpu] Error 2
>
> Hm, so this was what you meant with gcc 4.2. Try this:
> $ brew install llvm-gcc-28
> $ sudo ln -s /usr/local/Cellar/llvm-gcc28/2.8/bin/llvm-gcc /usr/bin/llvm-gcc-4.2
>
> Works like a champ here with default Makefile. But I *only* use that bastard for CUDA. My normal "gcc" is a symlink in /usr/local/bin/gcc that points to (Homebrew) gcc-4.7 in the same directory - and /usr/local/bin is first in my path. And I build macosx-x86-64-native-gpu, which give me both CUDA and OpenCL support at once.
>
>
>> $ make clean macosx-x86-64-opencl
>> (...)
>> ld: warning: directory not found for option '-L/usr/local/ssl/lib'
>
> This hints about the ancient native OpenSSL being used instad of a decent version. I don't think it matters for DMG but you can fix it like this:
>
> $ brew install openssl
> $ ln -s /usr/local/opt/openssl/ /usr/local/ssl
>
> Phew. I should update that OSX section of doc/INSTALL.
>
>
>> $ ./john --format=dmg-opencl --wordlist=/WList/run/output_single.txt
>> /Users/kris/Dropbox/Public/jeff-sparsebundle-hash/hash
>> Device 1: GeForce GT 750M
>> Local worksize (LWS) 64, Global worksize (GWS) 9216
>> Loaded 1 password hash (dmg-opencl, Apple DMG [PBKDF2-SHA1 3DES/AES OpenCL])
>> Press 'q' or Ctrl-C to abort, almost any other key for status
>> Abort trap: 6
>
> Like I said, it's probably the GWS figure that's too high. try this:
>
> $ GWS=128 ./john --format=dmg-opencl --wordlist=/WList /run/output_single.txt /Users/kris/Dropbox/Public/jeff-sparsebundle-hash/hash
>
> Check for lag of response when pressing a key for status. If it's immediate, try doubling that GWS value. If response lags more than 5-10 seconds the GWS is too high.
>
> magnum
>
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