Re: [MacPerl] <aucun objet>

[Paul Schinder <schinder@pobox.com>]

At 10:22 AM -0500 1/22/00, Chris Nandor wrote:
>At 7.40 +0000 2000.01.22, Bart Lateur wrote:
>  >One thing I found out, is that MAcPerl is TERRIBLY slow to simply list
>  >the whole contents of a CD, using File::Find, or using readdir() and the
>  >file operators (-X). I'm talking about *hours*, for just *one* CD.
>  >Actually, I tried to list the contents of a CD, with size and file info,
>  >not more than a few directories with a few hundred files, and I had to
>  >interrupt it after 4 hours. Less than half of the files were processed
>  >in this time.
>
>Odd.  I have a CD with 856 items (files and folders) and this script runs
>in one second:
>
>   #!perl -wl
>   use File::Find;
>   find(sub { push @a, $File::Find::name }, 'Neely:');
>   print scalar @a;
>   print time - $^T;
>
>Some information had been cached (I know this because I am on battery, and
>on sunsequent runs, the CD did not even bother to spin up :), so I popped
>in a CD that this machine had never seen before, with 5243 items, and it
>took 24 seconds.
>
>PowerBook G3/400, Mac OS 9, DVD-ROM (I forget what speed it spins CDs at).

Same here, only the first CD I found only had 79 files.  MacOS 9, 
iBook, CD is a 16x (I think) IDE. 1 second with your script.

Of course, he did say size and file info.  Making a few modifications 
and turning it into a droplet:

#!perl -wl
use File::Find;
find(sub { push @a, $File::Find::name; push @b, -s $File::Find::name;
            push @c , (-d $File::Find::name || -l $File::Find::name)
            ? ("DIR","DIR") :
            MacPerl::GetFileInfo($File::Find::name)}, shift);
print scalar @a;
print time - $^T;
sleep 3;
for($i = 0, $j = 0;$i < @a; $i++, $j++) {
     print "$a[$i] $b[$i] $c[$j++], $c[$j]";
}


Now it takes 2 seconds for the same data CD, burnt on my Mac running 
Linux as a Mac/ISO hybrid.  I just remembered I have a more taxing 
CD, so I tried it.  That one has 544 files and takes 84 seconds.  And 
you're right, after the first time the drive doesn't spin up.

I can believe that it matters a great deal what kind of CD drive (IDE 
or SCSI), which OS, and what controller's inside.  On my Performa 
6400 running MacOS 8.6 it takes about 15 minutes for a CPAN.pm "r", 
during which time I can't do anything else.  That's on the IDE drive. 
When the same box is running Linux on my SCSI drive, it takes a 
minute or less and, of course, I can do anything else I want.  (I 
avoid using the MacOS drive when running Linux, so I don't know 
whether I'd have the same problems or not.  The new kernel, 2.2.14, 
seems to have much improved IDE drivers, though.)  On the iBook (IDE 
internal), I can run a CPAN "r" in a minute or so, and can put 
MacPerl in the background and do other things while doing it.

>
>--
>Chris Nandor          mailto:pudge@pobox.com         http://pudge.net/
>%PGPKey = ('B76E72AD', [1024, '0824090B CE73CA10  1FF77F13 8180B6B6'])

--
Paul Schinder
schinder@pobox.com

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