A small program to translate -agentlib:hprof=cpu=times,depth=999 output to folded Flame Graphs format.

stackcollapse-hprof.pl

#! /usr/bin/perl

$stage = 1;

while (<STDIN>) {
    if ($stage == 1) {
        if (/TRACE (\d+)/) {
            if ($line ne '') {
                $cpu{$id} = $line;
            }
            $id = $1;
            $line = '';
        } elsif (/CPU TIME.*BEGIN/) {
            $cpu{$id} = $line;
            $stage = 2;
        } elsif (/^\s+(.*?)\(/) {
            if ($line ne '') {
                $line = "$1;$line";
            } else {
                $line = $1;
            }
        }
    } else {
        if (/\s(\d+)\.(\d+)%\s.*%.*\s(3\d\d\d\d\d)\s/) {
            print $cpu{$3}." ".$1.$2."\n";
        }
    } 
}

A more sophisticated python tool at https://github.com/cykl/hprof2flamegraph.