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#!/usr/bin/perl -w
#
# hotuser - sample on-CPU user-level functions and libraries.
# Written using Perl and DTrace (Solaris 10 03/05)
#
# This samples the on-CPU function at 1001 Hertz, for a simple yet
# effective user-level profiling tool for sampling exclusive function time.
# The output will identify which function is on the CPU the most - which
# is the hottest. See Notes/ALLexclusive_notes.txt for an explanation of
# exclusive time.
#
# $Id: hotuser 65 2007-10-04 11:09:40Z brendan $
#
# USAGE: hotuser [-hl] { -c command | -p PID }
#
# -h # help
# -l # match libraries, not functions
# -p PID # examine this PID
# -c command # run and examine this command
# eg,
# hotuser -p 81 # sample user functions from PID 81
# hotuser -lp 81 # sample user libraries from PID 81
# hotuser -p `pgrep -n Xorg` # sample Xorg
#
# FIELDS:
# FUNCTION Function name
# LIBRARY Library name
# COUNT Number of samples
# PCNT Percentage of total samples
#
# COPYRIGHT: Copyright (c) 2006 Brendan Gregg.
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License, Version 1.0 only
# (the "License"). You may not use this file except in compliance
# with the License.
#
# You can obtain a copy of the license at Docs/cddl1.txt
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# CDDL HEADER END
#
# Author: Brendan Gregg [Sydney, Australia]
#
# 29-Jun-2006 Brendan Gregg Created this.
# 29-Jun-2006 " " Last update.
#
use strict;
use Getopt::Std;
#
# Command Line Arguments
#
my $args;
usage() if defined $ARGV[0] and $ARGV[0] eq "--help";
getopts('c:hlp:') or usage();
usage() if defined $main::opt_h and $main::opt_h;
my $libs = defined $main::opt_l and $main::opt_l ? 1 : 0;
if (defined $main::opt_c) {
$args = "-c $main::opt_c";
}
elsif (defined $main::opt_p) {
$args = "-p $main::opt_p";
}
else {
usage();
}
#
# Cleanup on signals
#
$SIG{INT} = \&cleanupsig; # Ctrl-C
$SIG{QUIT} = \&cleanupsig; # Ctrl-\
$SIG{TERM} = \&cleanupsig; # TERM
#
# Declare DTrace script
#
my $dtrace = <<END;
/usr/sbin/dtrace -n '
#pragma D option quiet
profile:::profile-1001hz
/pid == \$target/
{
\@pc[arg1] = count();
}
dtrace:::END
{
printa("OUT: %A %\@d\\n", \@pc);
}
' '$args'
END
#
# Run DTrace, process output
#
my %Count;
my $total;
open DTRACE, "$dtrace |" or die "ERROR1: Can't run dtrace (perms?): $!\n";
print "Sampling... Hit Ctrl-C to end.\n";
while (my $line = <DTRACE>) {
next if $line =~ /^\s*$/;
next if $line !~ /^OUT: /;
my ($tag, $addr, $count) = split ' ', $line;
my ($name, $offset) = split /\+/, $addr;
next if $name eq "0x0";
$name =~ s/\`.*// if $libs;
$Count{$name} += $count;
$total += $count;
}
close DTRACE;
#
# Print final report
#
printf "\n%-52s %8s %6s\n", $libs ? "LIBRARY" : "FUNCTION", "COUNT", "PCNT";
foreach my $name (sort { $Count{$a} <=> $Count{$b} } keys %Count) {
printf "%-52s %8d %5.1f%%\n", $name, $Count{$name},
100 * $Count{$name} / ($total ? $total : 1);
}
#
# Subroutines
#
sub cleanupsig {
}
sub usage {
print STDERR "USAGE: hotuser [-hl] { -c command | -p PID }\n";
print STDERR " eg,\n";
print STDERR " hotuser -p 81 # sample user funcs for PID 81\n";
print STDERR " hotuser -lp 81 # sample user libs for PID 81\n";
print STDERR " hotuser -p `pgrep -n Xorg` # sample Xorg\n";
exit 1;
}
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