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Message-ID: <20180828131656.GA18179@fantomas.sk>
Date: Tue, 28 Aug 2018 15:16:56 +0200
From: Matus UHLAR - fantomas <uhlar@...tomas.sk>
To: john-users@...ts.openwall.com
Subject: Re: Beignet: unable to find good values for
local_work_size
>On 2018-08-27 11:54, Matus UHLAR - fantomas wrote:
>>for a few weeks, the beignet OpenCL driver reports this message:
>>
>>Loaded 1 password hash (mysql-sha1-opencl, MySQL 4.1+ [SHA1 OpenCL])
>>Beignet: "unable to find good values for local_work_size[i], please
>>provide\n" " local_work_size[] explicitly, you can find good values with\n"
>>" trial-and-error method."
>>
>>I understand it as the driver does not provide any useful value and
>>the john
>>is just guesssing.
>>
>>How can I test for the proper value? can I do it at runtime?
On 27.08.18 19:36, magnum wrote:
>That message comes from Beignet, not john. What is triggering it is
>likely that we deliberately use a local work size of NULL for
>incomplete batches (eg. the very last batch in a session). There's not
>really any way you can provide it... short of reverting to some commit
>before https://github.com/magnumripper/JohnTheRipper/issues/3223 where
>we had another scheme (which had other problems).
>
>I would report it to them as a bug, because according to the OpenCL
>spec. it should handle it. I believe what most drivers/runtimes do is
>find greatest divisor of GWS that is less than or equal to highest
>possible LWS, and use that.
>
>Does it crash/abort or is this just a warning message? It could be
>that it simply warns and then use an LWS of 1 which is suboptimal but
>works fine in this case.
since the cracking seems to continue, it is apparently just a warning, so I
will ignore it for now.
Thanks for explanation
--
Matus UHLAR - fantomas, uhlar@...tomas.sk ; http://www.fantomas.sk/
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