Re: grep extremely slow on OSX

[Titus von der Malsburg]

On Sun, Feb 7, 2010 at 10:00 AM, Paolo Bonzini <address@hidden> wrote:
> It means we identified the culprit (the regex engine; possibly the
> strcoll/wcscoll calls used to handle [0-9]), but it is still strange
> because, AFAICT, the regex code should not even be invoked unless you use
> grep -o or --color or similar options.  Instead, grep should use its own DFA
> implementation.
>
> Running under LC_ALL=C should mitigate or eliminate the bad performance.

Thanks Paolo!  Indeed I get a factor ~8 speedup on Linux and factor
>1400 on OSX.

If you want me to run any analyses on OSX, let me know.

  Titus