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# Copyright (C) 2013-2020 Free Software Foundation, Inc.
# 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 3 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
# 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, see <>.
from perftest import perftest
class BackTrace (perftest.TestCaseWithBasicMeasurements):
def __init__(self, depth):
super (BackTrace, self).__init__ ("backtrace")
self.depth = depth
def warm_up(self):
# Warm up.
gdb.execute ("bt", False, True)
gdb.execute ("bt", False, True)
def _do_test(self):
"""Do backtrace multiple times."""
do_test_command = "bt %d" % self.depth
for _ in range(1, 15):
gdb.execute (do_test_command, False, True)
def execute_test(self):
line_size = 2
for _ in range(1, 12):
# Keep the total size of dcache unchanged, and increase the
# line-size in the loop.
line_size_command = "set dcache line-size %d" % (line_size)
size_command = "set dcache size %d" % (4096 * 64 / line_size)
# Cache is cleared by changing line-size or size.
gdb.execute (line_size_command)
gdb.execute (size_command)
func = lambda: self._do_test()
self.measure.measure(func, line_size)
line_size *= 2