Re: Optimize my script

On Wed, Jul 18, 2007 at 10:17:00AM +0000, JeeBee wrote:

Thanks Paul, I should profile of course, should have thought about that.

I tried the below, but it's not quite clear what this means to me.
When I run with "./analyze.pl foo bar" the execution time is fast, so the
problem is not starting up/exiting of Perl, and I conclude it must be
inside the script somwhere.

DirHandle::BEGIN takes only 0.01 seconds, so that's not it either.
I don't see the regular expressions anywhere, unfortunately.
Is there a way to change that?

Thanks

$ perl -d:DProf ./analyze.pl traplas-example output
...
$ dprofpp
Total Elapsed Time = 1.109888 Seconds
User+System Time = 1.039888 Seconds
Exclusive Times
%Time ExclSec CumulS #Calls sec/call Csec/c Name
0.96 0.010 0.010 2 0.0050 0.0050 DirHandle::BEGIN
0.00 - -0.000 1 - - DirHandle::DESTROY
0.00 - -0.000 1 - - strict::bits
0.00 - -0.000 1 - - strict::import
0.00 - -0.000 1 - - Symbol::BEGIN
0.00 - -0.000 1 - - Symbol::gensym
0.00 - -0.000 1 - - DirHandle::read
0.00 - -0.000 1 - - DirHandle::open
0.00 - -0.000 2 - - Exporter::import
0.00 - -0.000 1 - - DirHandle::new
0.00 - 0.010 2 - 0.0050 main::BEGIN

I'm not very familiar with the profiler, but at a guess, I would say
that the profiler only counts time in subroutines, and that the majority
(all?) of your program is not in a subroutine, and over 99% of the
execution time of your program is in that code.

I see the following options:

- split your code into subroutines to gain a better understanding of
what is taking how much time

- install Devel::Cover and run
$ perl -MDevel::Cover ./analyze.pl traplas-example output
$ cover
to gain a finer grained but less accurate profiling report

- go back to guessing - you were probably right ;-)

- post your code so that other people can guess too

- buy more hardware

--
Paul Johnson - paul@xxxxxxxx
http://www.pjcj.net
.

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