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Message-ID: <20250615020703.GA29393@openwall.com> Date: Sun, 15 Jun 2025 04:07:03 +0200 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: Problem running john with --rules=oi On Mon, Jun 09, 2025 at 06:56:47PM -0700, jeff wrote: > Right now I have 256gb of ram, and I am using 239gb total (as soon as > john starts up). > I am not worried about using more ram as I find hashes, so I seem > limited to about 34 forks for now. Oh, it sounds like Cygwin's fork() emulation just copies everything right away. > Cygwin and/or windows does weird stuff with more than 64 threads. I > complained to the cygwin > mailing list and they told me that was a windows feature :-( I found the thread: https://sourceware.org/pipermail/cygwin/2023-September/254395.html I don't know why, but in there you're talking about "POSIX threads". What you're running now are fork()'ed processes. Now, those _might_ be implemented as a special kind of threads by Cygwin under the hood, and maybe the same limitations would apply, or maybe not. > Right now I am using my main computer to do the cracking. It does dual > boot into mageia-linux, but > I have be unable to install any version of ubuntu. For now, I will stick > to cracking on windows, though > cygwin can be less than ideal. You could also try WSL, so you'd run a Linux build of John under Windows. Alexander
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