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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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