[PATCH 4/4] Test on solib load and unload

Yao Qi
2013-10-16T07:10:44Z

This patch is to add a test case to on the performance of GDB handling
load and unload of shared library.

In V3, there are some changes,

- Adapt to perf test framework changes.
- Measure load and unload separately.

In V2, there are some changes,

- A new proc gdb_produce_source to produce source files. I tried to
move all source file generation code out of solib.exp, but
compilation step still needs to know the generated file names. I
have to hard-code the file names in compilation step, which is not
good to me, so I give up on this moving.
- SOLIB_NUMBER -> SOLIB_COUNT
- New variable SOLIB_DLCLOSE_REVERSED_ORDER to control the order of
iterating a list of shared libs to dlclose them.
- New variable GDB_PERFORMANCE to enable these perf test cases.
- Remove dlsym call in solib.c.
- Update solib.py for the updated framework.

gdb/testsuite/

* lib/gdb.exp (gdb_produce_source): New procedure.
* gdb.perf/solib.c: New.
* gdb.perf/solib.exp: New.
* gdb.perf/solib.py: New.
---
gdb/testsuite/gdb.perf/solib.c | 78 ++++++++++++++++++++++++++++++++++++++
gdb/testsuite/gdb.perf/solib.exp | 78 ++++++++++++++++++++++++++++++++++++++
gdb/testsuite/gdb.perf/solib.py | 73 +++++++++++++++++++++++++++++++++++
gdb/testsuite/lib/gdb.exp | 16 ++++++++
4 files changed, 245 insertions(+), 0 deletions(-)
create mode 100644 gdb/testsuite/gdb.perf/solib.c
create mode 100644 gdb/testsuite/gdb.perf/solib.exp
create mode 100644 gdb/testsuite/gdb.perf/solib.py

diff --git a/gdb/testsuite/gdb.perf/solib.c b/gdb/testsuite/gdb.perf/solib.c
new file mode 100644
index 0000000..42973d6
--- /dev/null
+++ b/gdb/testsuite/gdb.perf/solib.c
@@ -0,0 +1,78 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright (C) 2013 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
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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 <http://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef __WIN32__
+#include <windows.h>
+#define dlopen(name, mode) LoadLibrary (TEXT (name))
+# define dlsym(handle, func) GetProcAddress (handle, func)
+#define dlclose(handle) FreeLibrary (handle)
+#else
+#include <dlfcn.h>
+#endif
+
+static void **handles;
+
+void
+do_test_load (int number)
+{
+ char libname[40];
+ int i;
+
+ handles = malloc (sizeof (void *) * number);
+
+ for (i = 0; i < number; i++)
+ {
+ sprintf (libname, "solib-lib%d", i);
+ handles[i] = dlopen (libname, RTLD_LAZY);
+ if (handles[i] == NULL)
+ {
+ printf ("ERROR on dlopen %s\n", libname);
+ return;
+ }
+ }
+}
+
+void
+do_test_unload (int number)
+{
+ int i;
+
+ /* Unload shared libraries in different orders. */
+#ifndef SOLIB_DLCLOSE_REVERSED_ORDER
+ for (i = 0; i < number; i++)
+#else
+ for (i = number - 1; i >= 0; i--)
+#endif
+ dlclose (handles[i]);
+
+ free (handles);
+}
+
+static void
+end (void)
+{}
+
+int
+main (void)
+{
+ end ();
+
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.perf/solib.exp b/gdb/testsuite/gdb.perf/solib.exp
new file mode 100644
index 0000000..fc66f77
--- /dev/null
+++ b/gdb/testsuite/gdb.perf/solib.exp
@@ -0,0 +1,78 @@
+# Copyright (C) 2013 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
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# 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 <http://www.gnu.org/licenses/>.
+
+# This test case is to test the performance of GDB when it is handling
+# the shared libraries of inferior are loaded and unloaded.
+load_lib perftest.exp
+
+if [skip_perf_tests] {
+ return 0
+}
+
+standard_testfile .c
+set executable $testfile
+set expfile $testfile.exp
+
+# make check-perf RUNTESTFLAGS='solib.exp SOLIB_COUNT=1024'
+if ![info exists SOLIB_COUNT] {
+ set SOLIB_COUNT 128
+}
+
+PerfTest::assemble {
+ compile {
+ for {set i 0} {$i < $SOLIB_COUNT} {incr i} {
+
+ # Produce source files.
+ set libname "solib-lib$i"
+ set src [standard_output_file $libname.c]
+ set exe [standard_output_file $libname]
+
+ gdb_produce_source $src { "int shr$i (void) {return 0;}" }
+
+ # Compile.
+ if { [gdb_compile_shlib $src $exe {debug}] != "" } {
+ untested "Couldn't compile $src."
+ return -1
+ }
+
+ # Delete object files to save some space.
+ file delete [standard_output_file "solib-lib$i.c.o"]
+ }
+
+ set compile_flags {debug shlib_load}
+ global SOLIB_DLCLOSE_REVERSED_ORDER
+
+ if [info exists SOLIB_DLCLOSE_REVERSED_ORDER] {
+ lappend compile_flags "additional_flags=-DSOLIB_DLCLOSE_REVERSED_ORDER"
+ }
+
+ if { [gdb_compile "$srcdir/$subdir/$srcfile" ${binfile} executable $compile_flags] == "" } {
+ PerfTest::compiled
+ }
+ }
+} {
+ startup_gdb {
+ clean_restart $binfile
+
+ if ![runto_main] {
+ fail "Can't run to main"
+ return -1
+ }
+ }
+} {
+ run {
+ gdb_test_no_output "python SolibLoadUnload\($SOLIB_COUNT\).run()"
+ }
+}
diff --git a/gdb/testsuite/gdb.perf/solib.py b/gdb/testsuite/gdb.perf/solib.py
new file mode 100644
index 0000000..91393b1
--- /dev/null
+++ b/gdb/testsuite/gdb.perf/solib.py
@@ -0,0 +1,73 @@
+# Copyright (C) 2013 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
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# 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 <http://www.gnu.org/licenses/>.
+
+# This test case is to test the speed of GDB when it is handling the
+# shared libraries of inferior are loaded and unloaded.
+
+from perftest import perftest
+from perftest import measure
+
+class SolibLoadUnload1(perftest.TestCaseWithBasicMeasurements):
+ def __init__(self, solib_count, measure_load):
+ if measure_load:
+ name = "solib_load"
+ else:
+ name = "solib_unload"
+ # We want to measure time in this test.
+ super (SolibLoadUnload1, self).__init__ (name)
+ self.solib_count = solib_count
+ self.measure_load = measure_load
+
+ def warm_up(self):
+ do_test_load = "call do_test_load (%d)" % self.solib_count
+ do_test_unload = "call do_test_unload (%d)" % self.solib_count
+ gdb.execute(do_test_load)
+ gdb.execute(do_test_unload)
+
+ def execute_test(self):
+ num = self.solib_count
+ iteration = 5;
+
+ while num > 0 and iteration > 0:
+ # Do inferior calls to do_test_load and do_test_unload in pairs,
+ # but measure differently.
+ if self.measure_load:
+ do_test_load = "call do_test_load (%d)" % num
+ func = lambda: gdb.execute (do_test_load)
+
+ self.measure.measure(func, num)
+
+ do_test_unload = "call do_test_unload (%d)" % num
+ gdb.execute (do_test_unload)
+
+ else:
+ do_test_load = "call do_test_load (%d)" % num
+ gdb.execute (do_test_load)
+
+ do_test_unload = "call do_test_unload (%d)" % num
+ func = lambda: gdb.execute (do_test_unload)
+
+ self.measure.measure(func, num)
+
+ num = num / 2
+ iteration -= 1
+
+class SolibLoadUnload(object):
+ def __init__(self, solib_count):
+ self.solib_count = solib_count;
+
+ def run(self):
+ SolibLoadUnload1(self.solib_count, True).run()
+ SolibLoadUnload1(self.solib_count, False).run()
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 3efd539..28aca53 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -1796,6 +1796,22 @@ proc supports_reverse {} {
return 0
}

+# Produce source file NAME and write SOURCES into it.
+
+proc gdb_produce_source { name sources } {
+ set index 0
+ set f [open $name "w"]
+
+ while { ${index} < [llength ${sources}] } {
+ set line [lindex ${sources} ${index}]
+ set index [expr ${index} + 1]
+
+ set line [uplevel list $line]
+ puts $f $line
+ }
+ close $f
+}
+
# Return 1 if target is ILP32.
# This cannot be decided simply from looking at the target string,
# as it might depend on externally passed compiler options like -m64.
--
1.7.7.6