From: Axel Schmalowsky <aschmalowsky@...>
Date: 2009-07-07T00:05:49+09:00
Subject: Regexp-engine: ruby vs. perl

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Hello list,

I've got a question about ruby's regexp-engine: I'm wondering why ruby's
regexp-engine is soo much slower than perl's.

My test file looks like this (status.dat from nagios):

<status-type> {
    key=value
    ... ~20 further key=value pairs
 }

This file's size is about 100MB.

[perl -- v5.8.8]
time perl -wnl -00 -e 'print if /host_name=monslave\d+/ and
/service_description=load/ and /servicestatus\s+{[^}]+}/m'
/tmp/status.dat  >/dev/null
perl -wnl -00 -e  /tmp/status.dat > /dev/null  0.90s user 0.11s system
51% cpu 1.946 total

[ruby19 -- ruby 1.9.1p129 (2009-05-12 revision 23412) [i686-linux]]
time ruby19 -wnl -00 -e 'print if /host_name=monslave\d+/ and
/service_description=load/ and /servicestatus\s+{[^}]+}/m'
/tmp/status.dat  >/dev/null
ruby19 -wnl -00 -e  /tmp/status.dat > /dev/null  5.13s user 0.15s system
50% cpu 10.449 total


[ruby18 -- ruby 1.8.7p5000 (2009-02-19) [i686-linux]]
time ruby18 -wnl -00 -e 'print if /host_name=monslave\d+/ and
/service_description=load/ and /servicestatus\s+\{[^}]+\}/m'
/tmp/status.dat  >/dev/null
ruby18 -wnl -00 -e  /tmp/status.dat > /dev/null  3.93s user 0.05s system
48% cpu 8.153 total

So, both versions of ruby are slower than perl and I'm wondering why.

I'd like to integrate ruby in my daily work (it's actually a
wonderful/beatiful language) it's hard to justify when things like the
trivial regexp above is about a factor of 4-5 slower than in perl.
And writing/using regexps is part of my daily work.


Thanks

- --
Freundliche Gr��e / Kind regards

Axel Schmalowsky
Platform Engineer
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