The script is a little old but still works. However, on boxes with very large amounts of RAM (100G+), top doesn't give an answer in K anymore and the script breaks. I took out the if statement in the main loop that grabs the memory and replaced it with: 

my $free= `free|fgrep Mem`;

if($free=~/Mem\s*:\s+(\S+)\s+/i)
{
        $totalmem = convtok($1);
}
else
{
        die("Can't find memory info\n");
}

[download]
just above the foreach and that worked for our 680GB ram monster.

In reply to Re: Analyzing Apache memory usage by Anonymous Monk
in thread Analyzing Apache memory usage by Azhrarn

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