Here's another way. It may be a better way. I've used Tie::File so that, even with very large input files, you won't run into any memory issues.
use strict;
use warnings;
use Tie::File;
my $infile = q{noa.txt};
my $wanted_re = qr{
\A
(?>
(
Pass \s \# |
Elapsed \s Time \s+ : \s+ |
CPU \s Time \s+ : \s+ |
Virtual \s memory \s size \s+ : \s+ |
Resident \s set \s size \s+ : \s+ |
Major \s page \s faults \s+ : \s+
)
(
[\d.]+
)
)
}msx;
my $last_stat_re = qr{ \A Major \s page \s faults \s+ : \s+ \z }msx;
tie my @indata, q{Tie::File}, $infile or die $!;
for my $line (@indata) {
next if $line !~ $wanted_re;
print $2;
print $1 =~ $last_stat_re ? qq{\n} : q{, };
}
untie @indata;
I dummied up some additional input to what you provided:
$ cat noa.txt
...
Pass #123 ...
...
Elapsed Time : 1753.2 sec
CPU Time : 753.2 sec
...
Virtual memory size : 4472.6 MB
Resident set size : 4362 MB
...
Major page faults : 7153
...
Pass #the salt
...
Pass #124 ...
...
Elapsed Time : 9753.2 sec
CPU Time : 953.2 sec
...
Virtual memory size : 9472.6 MB
Resident Evil
Resident set size : 9362 MB
...
Major page faults : 9153
...
Here's the output:
$ noa.pl
123, 1753.2, 753.2, 4472.6, 4362, 7153
124, 9753.2, 953.2, 9472.6, 9362, 9153