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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