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gdbprof.py
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# -*- coding: utf-8 -*-
# Copyright (c) 2012 Mak Nazečić-Andrlon
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import gdb
from collections import defaultdict
from time import sleep
import os
import signal
def get_call_chain():
function_names = []
frame = gdb.newest_frame()
while frame is not None:
function_names.append(frame.name())
frame = frame.older()
return tuple(function_names)
class Function:
def __init__(self, name, indent):
self.name = name
self.indent = indent
self.subfunctions = []
# count of times we terminated here
self.count = 0
def add_count(self):
self.count += 1
def get_samples(self):
_count = self.count
for function in self.subfunctions:
_count += function.get_samples()
return _count
def get_percent(self, total):
return 100.0 * self.get_samples() / total
def get_name(self):
return self.name;
def get_func(self, name):
for function in self.subfunctions:
if function.get_name() == name:
return function
return None
def get_or_add_func(self, name):
function = self.get_func(name);
if function is not None:
return function;
function = Function(name, self.indent)
self.subfunctions.append(function)
return function
def print_samples(self, depth):
print "%s%s - %s" % (' ' * (self.indent * depth), self.get_samples(), self.name)
for function in self.subfunctions:
function.print_samples(depth+1)
def print_percent(self, prefix, total):
# print "%s%0.2f - %s" % (' ' * (self.indent * depth), self.get_percent(total), self.name)
subfunctions = {}
for function in self.subfunctions:
subfunctions[function.name] = function.get_percent(total)
i = 0
for name, value in sorted(subfunctions.iteritems(), key=lambda (k,v): (v,k), reverse=True):
new_prefix = ''
if i + 1 == len(self.subfunctions):
new_prefix += ' '
else:
new_prefix += '| '
print "%s%s%0.2f%% %s" % (prefix, "+ ", value, name)
# Don't descend for very small values
if value < 0.1:
continue;
self.get_func(name).print_percent(prefix + new_prefix, total)
i += 1
def add_frame(self, frame):
if frame is None:
self.count += 1
else:
function = self.get_or_add_func(frame.name())
function.add_frame(frame.older())
def inverse_add_frame(self, frame):
if frame is None:
self.count += 1
else:
function = self.get_or_add_func(frame.name())
function.inverse_add_frame(frame.newer())
class ProfileCommand(gdb.Command):
"""Wall clock time profiling leveraging gdb for better backtraces."""
def __init__(self):
super(ProfileCommand, self).__init__("profile", gdb.COMMAND_RUNNING,
gdb.COMPLETE_NONE, True)
class ProfileBeginCommand(gdb.Command):
"""Profile an application against wall clock time.
profile begin [DURING] [PERIOD]
DURING is the runtime of profiling in seconds.
The default DURING is 200 seconds.
PERIOD is the sampling interval in seconds.
The default PERIOD is 0.1 seconds.
"""
def __init__(self):
super(ProfileBeginCommand, self).__init__("profile begin",
gdb.COMMAND_RUNNING)
def invoke(self, argument, from_tty):
self.dont_repeat()
runtime = 20
period = 0.1
args = gdb.string_to_argv(argument)
if len(args) > 0:
try:
runtime = int(args[0])
if len(args) > 1:
try:
period = float(args[1])
except ValueError:
print("Invalid number \"%s\"." % args[1])
return
except ValueError:
print("Invalid number \"%s\"." % args[0])
return
def breaking_continue_handler(event):
sleep(period)
os.kill(gdb.selected_inferior().pid, signal.SIGINT)
# call_chain_frequencies = defaultdict(lambda: defaultdict(lambda: defaultdict(int)))
top = Function("Top", 2)
sleeps = 0
threads = {}
for i in xrange(0,runtime):
gdb.events.cont.connect(breaking_continue_handler)
gdb.execute("continue", to_string=True)
gdb.events.cont.disconnect(breaking_continue_handler)
for inf in gdb.inferiors():
inum = inf.num
for th in inf.threads():
thn = th.num
th.switch()
# call_chain_frequencies[inum][thn][get_call_chain()] += 1
frame = gdb.newest_frame()
while (frame.older() != None):
frame = frame.older()
# top.inverse_add_frame(frame);
# top.add_frame(gdb.newest_frame())
if thn not in threads:
threads[thn] = Function(str(thn), 2)
threads[thn].inverse_add_frame(frame)
sleeps += 1
gdb.write(".")
gdb.flush(gdb.STDOUT)
print "";
for thn, function in sorted(threads.iteritems()):
print ""
print "Thread: %s" % thn
print ""
function.print_percent("", function.get_samples())
# top.print_percent("", top.get_samples())
# print("\nProfiling complete with %d samples." % sleeps)
# for inum, i_chain_frequencies in sorted(call_chain_frequencies.iteritems()):
# print ""
# print "INFERIOR NUM: %s" % inum
# print ""
# for thn, t_chain_frequencies in sorted (i_chain_frequencies.iteritems()):
# print ""
# print "THREAD NUM: %s" % thn
# print ""
#
# for call_chain, frequency in sorted(t_chain_frequencies.iteritems(), key=lambda x: x[1], reverse=True):
# print("%d\t%s" % (frequency, '->'.join(str(i) for i in call_chain)))
#
# for call_chain, frequency in sorted(call_chain_frequencies.iteritems(), key=lambda x: x[1], reverse=True):
# print("%d\t%s" % (frequency, '->'.join(str(i) for i in call_chain)))
pid = gdb.selected_inferior().pid
os.kill(pid, signal.SIGSTOP) # Make sure the process does nothing until
# it's reattached.
gdb.execute("detach", to_string=True)
gdb.execute("attach %d" % pid, to_string=True)
os.kill(pid, signal.SIGCONT)
gdb.execute("continue", to_string=True)
ProfileCommand()
ProfileBeginCommand()