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#!/usr/bin/perl -w
#
# stackcollapse-go.pl collapse golang samples into single lines.
#
# Parses golang smaples generated by "go tool pprof" and outputs stacks as
# single lines, with methods separated by semicolons, and then a space and an
# occurrence count. For use with flamegraph.pl.
#
# USAGE: ./stackcollapse-go.pl infile > outfile
#
# Example Input:
# ...
# Samples:
# samples/count cpu/nanoseconds
# 1 10000000: 1 2
# 2 10000000: 3 2
# 1 10000000: 4 2
# ...
# Locations
# 1: 0x58b265 scanblock :0 s=0
# 2: 0x599530 GC :0 s=0
# 3: 0x58a999 flushptrbuf :0 s=0
# 4: 0x58d6a8 runtime.MSpan_Sweep :0 s=0
# ...
# Mappings
# ...
#
# Example Output:
#
# GC;flushptrbuf 2
# GC;runtime.MSpan_Sweep 1
# GC;scanblock 1
#
# Input may contain many stacks as generated from go tool pprof:
#
# go tool pprof -seconds=60 -raw -output=a.pprof http://$ADDR/debug/pprof/profile
#
# For format of text profile, See golang/src/internal/pprof/profile/profile.go
#
# Copyright 2017 Sijie Yang (yangsijie@baidu.com). All rights reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# (http://www.gnu.org/copyleft/gpl.html)
#
# 16-Jan-2017 Sijie Yang Created this.
use strict;
use Getopt::Long;
# tunables
my $help = 0;
sub usage {
die <<USAGE_END;
USAGE: $0 infile > outfile\n
USAGE_END
}
GetOptions(
'help' => \$help,
) or usage();
$help && usage();
# internals
my $state = "ignore";
my %stacks;
my %frames;
my %collapsed;
sub remember_stack {
my ($stack, $count) = @_;
$stacks{$stack} += $count;
}
#
# Output stack string in required format. For example, for the following samples,
# format_statck() would return GC;runtime.MSpan_Sweep for stack "4 2"
#
# Locations
# 1: 0x58b265 scanblock :0 s=0
# 2: 0x599530 GC :0 s=0
# 3: 0x58a999 flushptrbuf :0 s=0
# 4: 0x58d6a8 runtime.MSpan_Sweep :0 s=0
#
sub format_statck {
my ($stack) = @_;
my @loc_list = split(/ /, $stack);
for (my $i=0; $i<=$#loc_list; $i++) {
my $loc_name = $frames{$loc_list[$i]};
$loc_list[$i] = $loc_name if ($loc_name);
}
return join(";", reverse(@loc_list));
}
foreach (<>) {
next if m/^#/;
chomp;
if ($state eq "ignore") {
if (/Samples:/) {
$state = "sample";
next;
}
} elsif ($state eq "sample") {
if (/^\s*([0-9]+)\s*[0-9]+: ([0-9 ]+)/) {
my $samples = $1;
my $stack = $2;
remember_stack($stack, $samples);
} elsif (/Locations/) {
$state = "location";
next;
}
} elsif ($state eq "location") {
if (/^\s*([0-9]*): 0x[0-9a-f]+ (M=[0-9]+ )?([^ ]+) .*/) {
my $loc_id = $1;
my $loc_name = $3;
$frames{$loc_id} = $loc_name;
} elsif (/Mappings/) {
$state = "mapping";
last;
}
}
}
foreach my $k (keys %stacks) {
my $stack = format_statck($k);
my $count = $stacks{$k};
$collapsed{$stack} += $count;
}
foreach my $k (sort { $a cmp $b } keys %collapsed) {
print "$k $collapsed{$k}\n";
}
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