From: Madhu Reddy <[EMAIL PROTECTED]>
> When i ran perl script on multi processor
> machine...
> it is taking more time as than on single processor
> machine....
>
> Let me explain clearly....
>
> I have big file (.5Gb) it has 8 million records...
> my perl script will read each record and validates..
> Validation includes..checking each record lenghth
> etc....
>
> When i ran this script on single processor machine
> With 256MB RAM, It took 3 min to process 8 million
> records...
>
> If ran the same script on Multi processor machine
> (4 CPU's and 3GB RAM), it took 6min....
Unless the processing contains some SQL server or something similar
(basicaly some other process doing part of the work) you can't get
any improvement from the several processors. You script can run only
on one CPU at a time. The only way to peruse the several processors
would be to split the task in four.
The slowdown could have been caused by
1) slower filesystem
2) slower processors (as I said you are using just one of the four)
3) overhead of multiprocessing (I would not expect this to pay a big
role)
4) something I forgot to mention or do not know about
Jenda
===== [EMAIL PROTECTED] === http://Jenda.Krynicky.cz =====
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