I've really learned to love working with python, but it's too soon
to pack perl away. I was amazed at how long a simple file search took
so I ran some statistics:
$ time python find-rel.py
./find-relreq *.out | sort -u
TestCase_F_00_P
TestCase_F_00_S
TestCase_F_01_S
TestCase_F_02_M
real 1m4.581s
user 1m4.412s
sys 0m0.140s
$ time python find-rel.py
# modified to use precompiled REs:
TestCase_F_00_P
TestCase_F_00_S
TestCase_F_01_S
TestCase_F_02_M
real 0m29.337s
user 0m29.174s
sys 0m0.100s
$ time perl find-rel.pl
find-relreq.pl *.out | sort -u
TestCase_F_00_P
TestCase_F_00_S
TestCase_F_01_S
TestCase_F_02_M
real 0m5.009s
user 0m4.932s
sys 0m0.072s
Here's the programs:
#!/usr/bin/env python
# vim: tw=0
import sys
import re
isready = re.compile ("(.*) is ready")
relreq = re.compile (".*release_req")
for fn in sys.argv[1:]: # logfile name
tn = None
with open (fn) as fd:
for line in fd:
#match = re.match ("(.*) is ready", line)
match = isready.match (line)
if match:
tn = match.group(1)
#match = re.match (".*release_req", line)
match = relreq.match (line)
if match:
#print "%s: %s" % (tn, line),
print tn
vs.
while (<>) {
if (/(.*) is ready/) {
$tn = $1;
}
elsif (/release_req/) {
print "$tn\n";
}
}
Look at those numbers:
1 minute for python without precompiled REs
1/2 minute with precompiled REs
5 seconds with perl.
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