mmap was Re: [FWP] rewrite and simplify (out of memory)

[John Carter <john@dwaf-hri.pwv.gov.za>]

On Wed, 30 Jun 1999, Vicki Brown wrote:

> This one isn't very technical, so the "I'm new to Perl" folks can play

I'm not new to Perl, so I won't give the answer. But I'm also not a
full guru...

>  From the MacPerl list a while back
> 
>    > This code gives me an out of memory error
> 
> 	print "Please select a file to view: ";
> 	chomp($file_name = <STDIN>);
> 
> 	open(FILE, "$file_name");
> 	@newsgroups = <FILE>;
> 	print @newsgroups;
> 	close FILE;

It strikes me that there should be a fun way to mmap the file.  "man
perlipc" says you can't mmap to $strings because the garbage collector
might try do nasty things to it. (Hmm. Does it really have to?
Couldn't it just have a bit flag saying "I'm mmap'd don't collect me"?
I don't know, I haven't peered into the gurgling bowels of perl.)

I see you can mmap PDL's, (PDL::IO::FastRaw::mapfraw) but you have to
construct a .hdr file for it. Thus presumably you can mmap somehow
without a .hdr file by doing whatever they do in the murky depths of
PDL::IO::FastRaw.pm

Anybody ever done this?

John Carter                    EMail: ece@dwaf-hri.pwv.gov.za
Telephone : 27-12-808-0374x194 Fax:- 27-12-808-0338
<http://www.geocities.com/SoHo/Cafe/5947> or <http://iwqs.pwv.gov.za>

>From too much love of living, From hope and fear set free...


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