Re: How to speed up multiple regex in a loop for a big data?

One thing that leaps out at me is that you are sorting the keys of %mapper each time you read a record from input_file. Not sure how big a key is, but it might be worth sorting the keys just once before you read input_file, since you don't appear to alter the hash, this should be safe (although I don't know how big a key is). e.g.
my @map_keys = sort keys %mapper;
...
foreach $key (@map_keys) {
...

Comment on Re: How to speed up multiple regex in a loop for a big data?

Replies are listed 'Best First'.
Re^2: How to speed up multiple regex in a loop for a big data? by cdarke (Prior) on May 25, 2006 at 07:06 UTC
Come to think of it, why are you sorting the keys?	[reply]
Re^3: How to speed up multiple regex in a loop for a big data? by ruzam (Curate) on May 25, 2006 at 15:51 UTC
Hey, you're right! I was about to example a case for partial keys getting substituted, but then I realized the keys are wrapped in word boundries, so there's no chance of partial key substitution, and no reason to sort. Drop the sort and save some time.	[reply]
Re^3: How to speed up multiple regex in a loop for a big data? by MonkInPleasanton (Initiate) on May 25, 2006 at 16:06 UTC
You are right on unnecessary sorting. I copied over that part from somewhere and wasn't aware of what I was doing...	[reply]