gdb/testsuite/gdb.perf/backtrace.py

   1 # Copyright (C) 2013-2023 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 from perftest import perftest
  17
  18
  19 class BackTrace(perftest.TestCaseWithBasicMeasurements):
  20     def __init__(self, depth):
  21         super(BackTrace, self).__init__("backtrace")
  22         self.depth = depth
  23
  24     def warm_up(self):
  25         # Warm up.
  26         gdb.execute("bt", False, True)
  27         gdb.execute("bt", False, True)
  28
  29     def _do_test(self):
  30         """Do backtrace multiple times."""
  31         do_test_command = "bt %d" % self.depth
  32         for _ in range(1, 15):
  33             gdb.execute(do_test_command, False, True)
  34
  35     def execute_test(self):
  36
  37         line_size = 2
  38         for _ in range(1, 12):
  39             # Keep the total size of dcache unchanged, and increase the
  40             # line-size in the loop.
  41             line_size_command = "set dcache line-size %d" % (line_size)
  42             size_command = "set dcache size %d" % (4096 * 64 / line_size)
  43             # Cache is cleared by changing line-size or size.
  44             gdb.execute(line_size_command)
  45             gdb.execute(size_command)
  46
  47             func = lambda: self._do_test()
  48
  49             self.measure.measure(func, line_size)
  50
  51             line_size *= 2