Date: Wed, 12 Aug 2020 07:41:07 -0800 From: Royce Williams <royce@...ho.org> To: john-users@...ts.openwall.com Subject: Re: sha512crypt-opencl / Self test failed (cmp_all(1)) On Thu, Aug 6, 2020 at 5:21 AM Solar Designer <solar@...nwall.com> wrote: [..] On Wed, Aug 05, 2020 at 09:45:26PM -0800, Royce Williams wrote: > > When this happened to me, I dropped the speed on the specific boards by > > 10MHz or so until it stopped, > > When errors are infrequent, it's generally more efficient to just let > them happen once in a while, giving a higher average c/s rate than you'd > have at a lower clock rate. > Indeed. There's definitely a sweet spot there. I'm sure that the various Bitcoin forums from ZTEX have similar wisdom. > > using the "Frequency_[serial] = 999" syntax > > for that particular algorithm's section. > > > > If enough boards are lower than the default, it's easier to just change > the > > default and create exceptions for the remainder. > > Please remember that there's generally no point in adjusting frequencies > per board (except for testing) if you use all of your boards as one big > cluster. John is currently only able to use the boards synchronously, > so the slowest board will determine the cluster's overall performance. > > This changes when you use "--fork" or "--devices", but in particular > with "--fork" it'd probably be inconvenient for you to have some forked > processes terminate much sooner than others. So the per-board frequency > adjustment is generally only useful when you run per-board-set attacks, > explicitly targeting attacks to same-frequency lists of "--devices". Of > course, you'd also use "--session" to launch multiple attacks from the > same "run" directory. > Ah, yes - I'd been tuning relative to "--fork" ... once I re-discovered it. :) In my experience, for contests and similar time-critical scenarios, having some boards finish sooner also means (theoretically) getting some *results* sooner - which may be worth the inconvenience. Royce
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