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Message-ID: <20210109154752.GA31440@openwall.com>
Date: Sat, 9 Jan 2021 16:47:52 +0100
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Cracking rar password with rar-opencl
On Sat, Jan 09, 2021 at 04:38:18PM +0100, Anton Berggren wrote:
> Looks like my CPU is the only device being used now.
> In previous session my GPU was used. We determined that GPU had better
> performance.
>
> C:\Users\Anton\Downloads\john-1.9.0-jumbo-1-win64\run>john
> --format=rar-opencl --session=rockyou --wordlist=rockyou.txt rar.hashes
> Device 1: Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz
This suggests that something changed in your system setup. By default,
JtR uses what it thinks is likely the fastest OpenCL device, and perhaps
it was correctly choosing your NVIDIA GPU before. If it doesn't do that
now, then perhaps your NVIDIA GPU is somehow not available now - e.g.,
uninstalled driver or something.
If you continue with using the CPU, then you'd probably get slightly
better speeds by not using OpenCL.
Alexander
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