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

   1 # Copyright (C) 2015-2023 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 # 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 perftest
  29 from perftest import measure
  30 from perftest import utils
  31
  32
  33 class PrintCerr(perftest.TestCaseWithBasicMeasurements):
  34     def __init__(self, name, run_names, binfile):
  35         super(PrintCerr, self).__init__(name)
  36         self.run_names = run_names
  37         self.binfile = binfile
  38
  39     def warm_up(self):
  40         pass
  41
  42     def execute_test(self):
  43         for run in self.run_names:
  44             this_run_binfile = "%s-%s" % (self.binfile, utils.convert_spaces(run))
  45             utils.select_file(this_run_binfile)
  46             utils.runto_main()
  47             iteration = 5
  48             while iteration > 0:
  49                 utils.safe_execute("mt flush symbol-cache")
  50                 func = lambda: utils.safe_execute("print gm_std::cerr")
  51                 self.measure.measure(func, run)
  52                 iteration -= 1