Re: precompiled regex's to lua

[askok@...]

Here's the inofficial results of a small (20+ lines) test, 
run on three candidates.

Some observations:
     - Perl is about 2x faster than Lua
     - C is about 8x faster than Perl (NOT using regex, 
but csv in C wouldn't need either..)
     - Perl performance is _not_ dependent on the way one 
describes the regex (= it seems to automatically cache 
them, anyways!)

System:   PowerBook G4 1,6GHz  OS X

The exact times, especially 'real' are not that important. 
The magnitudes are.


# Perl (qr//):         28s   (31.37 real 26.58 user 1.19 
sys)
# Perl (//o):          28s   (43.45 real 26.70 user 1.58 
sys)
# Perl (//):           28s   (30.32 real 26.50 user 1.17 
sys)

# Lua (match):        50s   (70.44 real 48.70 user 1.71 
sys)
# Lua (gmatch):  1min 17s   (88.00 real 75.11 user 1.62 
sys)

# C (gets, strchr, -O3):    4s   (4.48 real 3.33 user 0.74 
sys)

For comparison, running "wc -l" on the file to get the 
disk overhead:

# wc (raw read):  2.7s  (30.96 real 1.49 user 1.22 sys)

-asko



On Fri, 10 Nov 2006 15:29:32 +1100
 "David Burgess" <dburgess@gmail.com> wrote:
> How does gmatch compare?
>
> db