Date: Mon, 14 Nov 2016 21:48:15 +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 06:18:25PM +0100, Patrick Proniewski wrote: > Speaking about memory limit on GPU, is there any ? It varies by format, specific GPU, etc. > I've seen benches of hashcat on badass GPU using only 2GB of the 8GB VRAM available. I have not yet had the opportunity to use JtR on GPU and I wonder if the limit is the same. Not necessarily the same. A potentially relevant limit is what clinfo lists as "Max memory allocation", but it varies across GPUs (can be a different fraction of total GPU memory) and might not apply to a given JtR format. (And we could work on making it not apply where it currently does.) There may be other limitations in JtR formats as well, not related to GPU/driver. For example, the thresholds in bt.c (perfect hash tables for fast hashes on GPU) suggest that it should work up to 200M hashes, and it tries to work beyond that but it might fail. magnum - I also just noticed it does try to remove duplicates. Hmm. Anyway, that's not john-users material anymore (but is john-dev or GitHub issue material). Alexander
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