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Message-Id: <04528A5E-D2B2-4585-8789-C94581B44F0C@gmail.com>
Date: Sun, 26 May 2019 20:33:36 -0700
From: Eric Oyen <eric.oyen@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: exact performance of supported ztex board for
WPA/PSK cracking
One of the issues I have here is high in-house temperatures during the summer. I live in a house with 1960’s quality insulation and uses only an evaporations cooler. I have had to take to using a small cube fridge to keep my Mac mini cool. This would also work for any GPU outboard cards if housed in a mini-ATX type case. However, your mileage may vary depending on your computer case and other factors.
-Eric
> On May 25, 2019, at 8:27 AM, Solar Designer <solar@...nwall.com> wrote:
>
> On Fri, May 24, 2019 at 06:28:32PM +0200, Johny Krekan wrote:
>> Thanx for information, so for cracking WPA PSK can John use other than GPU
>> acceleration if yes what devices?
>
> For practical purposes, it is just GPUs and CPUs. Theoretically, it is
> also any other devices for which you have an OpenCL backend.
>
>> GPUs are very temperature-intensive.
>
> You can underclock GPUs or reduce their power limit (where supported),
> or with our latest release (or bleeding-jumbo) you can also set a
> maximum temperature that JtR will try not to exceed by adjusting the
> duty cycle. Of course, this hurts performance. From the NEWS file and
> the release announcement:
>
> - Graceful handling of GPU overheating - rather than terminate the process,
> JtR will now optionally (and by default) sleep until the temperature is below
> the limit, thereby adjusting the duty cycle to keep the temperature around
> the limit. (Applies to NVIDIA and old AMD drivers. We do not yet have GPU
> temperature monitoring for new AMD drivers.) [Claudio, Solar; 2019]
>
> The corresponding john.conf settings are:
>
> # Abort the process or sleep for a while if a GPU hits this temperature (in C)
> AbortTemperature = 95
>
> # Instead of aborting, sleep for this many seconds to cool the GPU down when
> # the temperature hits the AbortTemperature value, then re-test the temperature
> # and either wake up or go to sleep again. Set this to 0 to actually abort.
> # Suppress repeated sleep/wakeup messages when SleepOnTemperature = 1,
> # we are interpreting this as intent to keep the GPU temperature around the limit.
> SleepOnTemperature = 1
>
> So you just change the 95 to a lower value according to your preference.
>
> Alexander
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