To verify that you've got it, as with most(all?) standard Perl modules, provided you know the name of the module, you should be able to view the perldocs for that module - if the perldocs are present, then the module is present. At a command prompt, do

   perldoc Benchmark
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If the perldoc for "Benchmark" appears, then you've got it - and the perldocs tell you how to use it.

I'm also including a script that I wrote - I call it "pwhich", which on a *nix platform does the same thing as the "which" command - it tells you where in your search path a command exists. So, pwhich tells you where in your Perl search path(@INC) that the module appears, *AND* it tells you what version of the module is installed there - according to the $VERSION string found in the module:

-------------------------------------------------------

#!/usr/bin/perl -w

######################################################################
+#######
# Name:       pwhich
# Purpose:    Perl version of "which" command
# Takes In:   1. Perl module name (Ex: DBI, DBD::Oracle)
#
# Writes Out: Either a. "No documentation found for "XYZ"
#
#                       where "XYZ" is the name of a Perl module speci
+fied
#                       by the user that does *NOT* exist,
#
#             Or     b. line 1 - the @INC location of the perl module,
+ and
#                       line 2 - the $Id version of the perl module
######################################################################
+#######

use strict;

my $ct_args = @ARGV;

if ($ct_args != 1) {
   print "\nUsage: pwhich <perl module name>\n\n";
   print "Example: pwhich DBI\n\n";
   exit;
}

my $perl_module = shift;

my $abs_filename = `perldoc -l $perl_module 2>&1`;

print "\n";

print "$abs_filename";
if ($abs_filename =~ /^No documentation found/) {
   print "\n";
   exit;
}
chomp($abs_filename);

open(IN,"<$abs_filename") || die "Can't open $abs_filename!";
while (<IN>) {
   if (/\s*\$[\w:]*VERSION\s*=/i) {
      print;
      last;
   }
}
close(IN);

print "\n";
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------------------------------------------------------

HTH.