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Date: Sat, 20 May 2023 10:12:58 -0700
From: jeff <>
Subject: Re: excessive memory usage when running john - 90

On 5/20/2023 10:04, Solar Designer wrote:
> On Fri, May 19, 2023 at 05:01:16PM -0700, jeff wrote:
>> I am running john-1.9.0-jumbo-1-win64 on a windows 10 pro computer.
>> The computer has 128gb of ram and an amd epyc processor with 16 cores
>> and 32 threads.
>> I am currently trying to find 4 descrypt passwords with john.
>> When I run john, and looking at the task manager performance tab, the
>> system is using 99.3 gigabytes of memory.
>> When i stop john, the system is using about 8gb or memory.
>> The task manager process view tab shows john using 65.0 megabytes of memory.
>> I am quite curious what part of john is using 90 gigabytes of ram, and
>> why it is using so much memory.
> We'll need to know more about your invocation of john to tell.  For
> example, are you running it on a wordlist this large, which could be
> getting memory-mapped?  JtR was overzealous with memory-mapping of
> wordlists, which we've since corrected, but I don't know how exactly
> that would have manifested on Windows.
I am running it on a very large wordlist, rockyou2021, which is 98 
I suspect it is getting memory mapped.

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