Announcing regex-tre-0.66 and benchmarks

[Donald Bruce Stewart]

simonmarhaskell:
> Chris Kuklewicz wrote:
> 
> >Your question has prompted me to go back into my PosixRE wrapping code 
> >and compare it to the PCRE code.  I have made some changes which ought 
> >to enhance the performance of the PosixRE code.  Let us see the new 
> >bechmarks on 10^6 bytes:
> >
> >PosixRE
> >(102363,["bcdcd","cdc"],["bbccd","bcc"])
> >
> >real    1m35.429s
> >user    1m17.862s
> >sys     0m1.455s
> >
> >total is 79.317s
> >
> >PCRE
> >(102363,["bcdcd","cdc"],["bbccd","bcc"])
> >
> >real    0m2.570s
> >user    0m1.702s
> >sys     0m0.219s
> >
> >total is 1.921s
> 
> So I still don't understand why PCRE should be 40 times faster than 
> PosixRE. Surely this can't be just due to differences in the underlying C 
> library?

It could be. The C regex.h is pretty slow.

    http://shootout.alioth.debian.org/gp4/benchmark.php?test=regexdna&lang=all

-- Don