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Date: Tue, 17 Jan 2012 12:40:41 -0500
From: Rich Rumble <>
Subject: Re: Fork=n

On Tue, Jan 17, 2012 at 12:14 PM, Solar Designer <> wrote:
> Rich,
> That's not entirely true.  I intentionally put the fork() call after the
> hashes are loaded - so they were mostly shared between the child
> processes.  Then as passwords get cracked and individual copy-on-write
> pages are modified, memory usage of the individual processes starts to
> grow slowly.
> I don't know if Cygwin implements this about as well as typical
> Unix-like systems do or not, though.
> How large did it get, specifically?  And how did you measure?  Maybe you
> merely assumed that each process had its own copy of the data, whereas
> in reality the data was mostly shared and you still had plenty of free
> RAM (or rather RAM available and used for disk caching as it normally is)?
4Gb (roughly)

> Or maybe you got a large percentage of passwords cracked in that run,
> which explains why each process would have its own copy of many of the
> pages.
No this is immediate I retrieved these from WMIC just now
starting a new run. (K is assumed e.g. 1072468K )
PageFileUsage  PeakPageFileUsage  PeakVirtualSize
1072468        1072468            1154318336
1072008        1072008            1142530048
1072008        1072008            1142530048
1072012        1072012            1142530048

PeakWorkingSetSize  PrivatePageCount  VirtualSize  WorkingSetSize
1065464             1098207232        1154318336   1091035136
1064672             1097736192        1142530048   1090224128
1064620             1097736192        1142530048   1090170880
1064684             1097740288        1142530048   1090236416

Loaded 12264106 password hashes with 4096 different salts (Traditional
DES [128/128 BS SSE2])
Remaining 12159811 password hashes with 4096 different salts

> Thank you for bringing this up!
I live to serve :)

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