[cl-ppcre-devel] slow matching

[Edi Weitz]

On Thu, 17 Jul 2008 08:55:23 -0600, Carlos Konstanski <ckonstanski at pippiandcarlos.com> wrote:

> I was not on the list at the time that Edi posted the message
> "1.4.0/1 performance" which is why I am posting a new one instead of
> replying.
>
> I am using threaded SBCL 1.0.18 on gentoo amd64.  On my platform,
> matching has slowed to a crawl.  It takes 1.5 to 2 seconds to
> perform the following match:
>
> (cl-ppcre:all-matches-as-strings "^\\d\\d\\d\\d-\\d\\d-\\d\\d\\d\\d:\\d\\d:\\d\\d\.0$" <anystring>)
>
> I'm sure I could write this regex better.  Nevertheless it runs
> hundreds of times slower than it did previously.
>
> I'll test on the same setup with x86 and give a report.

No need to do that, I just tested on x86 and it looks just as bad
there.  The good news is that I have a completely re-factored CL-PPCRE
on my hard disk which will be released in a couple of days and which
won't have this problem anymore, so stay tuned.

Thanks for the report,
Edi.