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Date: Fri, 19 Apr 2013 22:44:12 +0200
From: Jan Starke <jan.starke@...ofbed.org>
To: john-users@...ts.openwall.com
Subject: Re: Fuzzing with regular expressions
Hi,
I added -O3 to the compiler flags and buffered the output. On my system I
get 146 MB/s without randomized order :-)
Kind regards, Jan
2013/4/16 magnum <john.magnum@...hmail.com>
> On 16 Apr, 2013, at 23:25 , magnum <john.magnum@...hmail.com> wrote:
> > On 16 Apr, 2013, at 22:17 , Jan Starke <jan.starke@...ofbed.org> wrote:
> >> I just changed some things and was able to speed up rexgen by the
> >> factor of 5 (on my system) without using threads; additionally the
> >> ordering of the values is partly random. Maybe you want to give it a
> >> try...
> >
> > I am delighted to report that under OSX (built with gcc/g++) r44 is 11.5
> times faster than the last version I tried (which was r24 or so). Previous
> speed about 2.3MB/s (405K words/s) and now over 27 MB/s (4.6M words/s),
> using '[a-z]{0,5}'. This is still a bottleneck for very fast formats but,
> well, any way of producing candidates is and with the finer granularity of
> a regexp you might gain total time anyway.
>
> Maybe you should add -O2 or -O3 to the default build options? I now
> re-built it like this:
>
> $ CC=gcc CXX=g++ CFLAGS=-O2 CXXFLAGS=-O2 cmake ..
>
> ...and speed went up another 2.7x to 74 MB/s or 12.4M words/s. Using -O3
> boosts it a little more but not much.
>
> magnum
>
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