|Syntactic Confectionery Delight
Assining data to an array is slow..by smferris (Beadle)
|on Mar 01, 2001 at 02:52 UTC
smferris has asked for the wisdom of the Perl Monks concerning the following question:
Me again. (Can you tell I just really found this site. I knew it existed but really didn't browse it)
I'm parsing a fixed width flat file for use in loading to different destinations. Possibly back to a file, possibly into a database.
I figured unpack would be faster and cleaner and it is. As long as you don't assign the output of unpack to an array. EG:
Runs in about 20seconds on 2.1million rows. Modify the code as such: (added the array assignment)
Now the code runs in over a minute. I have to "transform" the different elements in @data. Is there anyway to make this faster? I'm assuming the memory structure for @data is being reallocated every iteration. Is that true?
As always, all help is greatly appreciated.
Shawn M Ferris