Date: Wed, 29 Apr 2020 13:42:04 +0200 From: Jirka Vejrazka <jirka.vejrazka@...il.com> To: Morgan Woodward <john-users@...ts.openwall.com> Subject: Re: Reduce CPU load. Is it possible? There is a setting in john.conf that asks JtR to only use CPU cycles that would otherwise be idle. It's set to "on" by default. So your CPU is at max usage (that's a good thing for password cracking!) but if any other program needs the CPU time, JtR will step aside. Why would you want to throttle to 80% CPU usage? If you are worried about temperatures or noise, you should probably move the password cracking job(s) to a different hardware. Most crackers are written in a way that squeezes as much power from existing hardware as possible to speed up the cracking. Your other option is to limit number of cores on multi-core system - that would reduce the overall system CPU usage (and slow down cracking). HTH Jirka On Wed, 29 Apr 2020 at 12:42, MA40 <ardeinternet@...il.com> wrote: > Hi. > > When John the Ripper is running, the CPU is overloaded (95% in my case). > > Would it be possible to configure it so that it does not work at full > capacity so as not to load the CPU so much? For example, configure it to > work at 80%. > > Thank you. > > MA40. >
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