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Date: Mon, 14 Nov 2016 16:19:59 +0100
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: Loading high number of hashes on GPU

On 2016-11-14 15:03, Luis Rocha wrote:
> Not sure if I'm doing something wrong but having hard time to load high
> number of hashes on GPU for raw-sha1.
>
> I have 20M sha1 hashes that I'm trying to load. The GPU has 4Gb RAM.
>
> $./john
> John the Ripper 1.8.0-jumbo-1-5344-gefae4e5+ OMP [linux-gnu 64-bit AVX2-ac]
>
>
> $./john 20M.hashes --wordlist=uniqwords  --pot=20M.pot
> --format=raw-sha1-opencl --session=gpu  --fork=2 --rules:Jumbo
>
> No dupe-checking performed when loading hashes.

I think the above message is a clue. Did you set NoLoaderDupeCheck in 
john.conf? That wont work with Sayantan's bitmap tables.

> Using default input encoding: UTF-8
> Loaded 20000000 password hashes with no different salts (Raw-SHA1-opencl
> [SHA1 OpenCL])
> Remaining 5347239 password hashes with no different salts
> Node numbers 1-2 of 2 (fork)
> Device 0: Hawaii
> Device 1: Hawaii
> /
> Progress is too slow!! trying next table size.
> \
> Progress is too slow!! trying next table size.
>
> Progress is too slow!! trying next table size.
>
> (..)
>
> This message keeps going and going (30m at least) ..

Sayantan's code tries to make perfect hash tables. Once it sees a dupe 
(and it will due to your NoLoaderDupeCheck setting) it will re-try forever.

magnum

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