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Message-ID: <217225c8-ca45-4964-b042-946d976fc567@jeffunit.com>
Date: Sat, 14 Jun 2025 19:46:41 -0700
From: jeff <jeff@...funit.com>
To: john-users@...ts.openwall.com
Subject: Re: Problem running john with --rules=oi
On 6/14/2025 7:07 PM, Solar Designer wrote:
>> 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.
I wrote a program that uses posix threads. It scales very well under
linux, but using cygwin's
posix threads it doesn't scale well above 64 threads. The cygwin folks
said it was a feature of windows.
I also have no idea if cygwin's forks behave the same was as cygwin's
posix threads.
Right now I am using 33 or 34 forks, as that maxes out my current 256gb
of ram running john.
It will likely be a while until I find enough hashes to be able to run
64+ forks.
jeff
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