file and "file -i"

[Julian Field]

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What happens when you run, say, 30 files at a time through "file -i" 
compared to File::Type?
I'm far more interested in the case when there are multiple command-line 
arguments to the "file" command, as this represents the situation under 
load, which is where speed counts.

Matt Hampton wrote:
> Steve Freegard wrote:
>   
>> UxBoD wrote:
>>     
>>> Hmmm, using a perl module would be a good idea Steve.  I wonder what
>>> the performance differential would be ?
>>>   
>>>       
>
> A very quick benchmark
>
>
> Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
>   Platform:
>     osname=linux, osvers=2.6.9-42.0.3.elsmp,
> archname=i386-linux-thread-multi
>
> 10516 Files ( assorted contents of my home directory so lots of source
> code object files etc)
>
>
> It is a busy box with not much memory so
>
> Using file:
>
> real    0m54.797s
> user    0m19.825s
> sys     0m30.454s
>
> Using File::Type
>
> real    0m27.974s
> user    0m11.161s
> sys     0m1.297s
>
>
>
> A list of files was created in a text file (to stop the find process
> being timed) and the script (below) was run as follows:
>
> time ./testfile.pl < list.files > /dev/null
>
>
>
>
> ---------
>
> #!/usr/bin/perl
>
>
> if (0) {
>
>   while (<>) {
>     chomp;
>     print `file '$_'`
>   }
>
> }
> else {
>   use File::Type;
>   my $ft = File::Type->new();
>
>   while (<>) {
>     chomp;
>     print $_."\t".$ft->checktype_filename($_);
>   }
> }
>   

Jules

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