On Tue, Feb 03, 2009 at 09:02:52PM -0500, Chris Jones wrote:
> On Tue, Feb 03, 2009 at 12:14:48PM EST, Gorka wrote:
> > Hi! I've got a perl script with this for:
> >
> > for (my $j=0;$j<=$#fichero1;$j++)
> > {
> > if (@fichero1[$j] eq $valor1)
> > {
> > $token = 1;
> > }
> > }
>
> > The problem is that fichero1 has 32 millions of records and moreover
> > I've got to repeat this for several millions times, so this way it
> > would take years to finish. Does anybody know a way to optimize this
> > script? Is there any other linux programing language I could make this
> > more quickly whith?
[snip]
> More seriouly, when you are dealing with 32 million records, one major
> venue for optimization is to keep disk access to a minimum. Disk access
> IIRC is measured in milliseconds, RAM access in nanoseconds and above..
>
> Do the math..
[silly time]
32 * 4 = 128
so with 128M of memory he could hold 32 Million long int - I realise the
record is probably got more than int's so with 1G of spare ram he could
have 32 bytes per record.
[/silly time]
[snip]
>
> HTH
>
> CJ
>
>
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