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Message-ID: <20161115050950.GA22638@openwall.com>
Date: Tue, 15 Nov 2016 06:09:50 +0100
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Loading high number of hashes on GPU
On Mon, Nov 14, 2016 at 10:31:12PM +0100, magnum wrote:
> It seems it's a de-facto standard to set it to a quarter
> of total memory (I haven't seen any GPU deviating from that).
There are exceptions. Looks like it's 2/3 of total on 7790 Bonaire
(or/and with this driver version):
Max memory allocation: 1398276096
Global memory size: 2084569088
Max pipe packet size: 1398276096
Max global variable size: 1258448384
Max global variable preferred total size: 2084569088
Also getting really weird results on 7730 (or was it 7750?) Capeverde
with 1 GB DDR3, which reports:
Max memory allocation: 595329024
Global memory size: 1018167296
58% of total? Even weirder: larger allocations succeed, including in
excess of 1 GB total, and appear to silently use host memory. Maybe use
of host memory is supported for this device because it's similar to
what's found in AMD APUs.
Alexander
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