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Date: Tue, 19 Dec 2017 16:06:11 +0100
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: OpenMP
On Tue, Dec 19, 2017 at 01:33:56PM +0000, Mounir Belhniyene wrote:
> Thank you so much for your fast reply. Here is it the example of password
> cracking :
>
> ensaf@...af:~/JohnTheRipper-bleeding-jumbo/run$ ./zip2john
> ~/Desktop/doc.zip > ~/Desktop/doczip.hash
> ver 1.0 efh 5455 efh 7875 doc.zip->doc PKZIP Encr: 2b chk, TS_chk,
> cmplen=62, decmplen=50, crc=80ECEF18
> ensaf@...af:~/JohnTheRipper-bleeding-jumbo/run$ ./john ~/Desktop/doczip.hash
> Using default input encoding: UTF-8
> Loaded 1 password hash (PKZIP [32/64])
> Warning: OpenMP is disabled; a non-OpenMP build may be faster
> Press 'q' or Ctrl-C to abort, almost any other key for status
This output suggests you might be on a system that has only one logical
CPU. Maybe a VM to which you didn't grant more than one logical CPU?
Also, the PKZIP format is a "fast" one, meaning that OpenMP scaling will
be poor even if you get it working, and you should prefer the "--fork"
option instead. But first you need to figure out how many logical CPUs
you have on this system.
Assuming this is Linux, can you please post the output of:
cat /proc/cpuinfo
Alexander
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