gdb/testsuite/gdb.perf/gmonster-print-cerr.py

   1 # Copyright (C) 2015-2024 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 # Test printing of std::cerr.
  17 # libstdc++ is typically near the end of the list of shared libraries,
  18 # and thus searched last (or near last).
  19 # Plus llvm had a bug where its pubnames output that gold uses to generate
  20 # the index caused a massive perf regression (basically it emitted an entry
  21 # for every CU that used it, whereas we only want the CU with the
  22 # definition).
  23 #
  24 # Note: One difference between this test and gmonster-ptype-string.py
  25 # is that here we do not pre-expand the symtab: we don't want include
  26 # GDB's slowness in searching expanded symtabs first to color these results.
  27
  28 from perftest import measure, perftest, utils
  29
  30
  31 class PrintCerr(perftest.TestCaseWithBasicMeasurements):
  32     def __init__(self, name, run_names, binfile):
  33         super(PrintCerr, self).__init__(name)
  34         self.run_names = run_names
  35         self.binfile = binfile
  36
  37     def warm_up(self):
  38         pass
  39
  40     def execute_test(self):
  41         for run in self.run_names:
  42             this_run_binfile = "%s-%s" % (self.binfile, utils.convert_spaces(run))
  43             utils.select_file(this_run_binfile)
  44             utils.runto_main()
  45             iteration = 5
  46             while iteration > 0:
  47                 utils.safe_execute("mt flush symbol-cache")
  48                 func = lambda: utils.safe_execute("print gm_std::cerr")
  49                 self.measure.measure(func, run)
  50                 iteration -= 1