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gprof 看看gobject的效率，API调用。
os
posted @ 2013年8月22日 14:17
in gprof
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http://www.ezdoum.com/stories.php?story=07/10/10/5189338
1. 重新编译glib
CFLAGS="-pg -g" ./autogen.sh --disable-gtk-doc --enable-debug=minimum \
--prefix=/your install path --disable-shared
make; make install
2. 写个测试代码
#define REPEATS 100000
#include <glib.h>
#include <glib-object.h>
/*************************/
#define TYPE_TEST_OBJECT (test_object_get_type ())
#define TEST_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
TYPE_TEST_OBJECT, TestObject))
#define IS_TEST_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
TYPE_TEST_OBJECT))
typedef struct _TestObject TestObject;
typedef struct _TestObjectClass TestObjectClass;
struct _TestObject
{
GObject parent_instance;
gint foo;
gchar *bar;
};
struct _TestObjectClass
{
GObjectClass parent_class;
};
GType test_object_get_type (void) G_GNUC_CONST;
TestObject *test_object_new (void);
enum
{
PROP_0,
PROP_FOO,
PROP_BAR
};
static void test_object_class_init (TestObjectClass *klass);
static void test_object_init (TestObject *object);
static void test_object_finalize (GObject *object);
static void test_object_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void test_object_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static GObjectClass *parent_class = NULL;
GType
test_object_get_type (void)
{
static GType test_object_type = 0;
if (!test_object_type)
{
static const GTypeInfo test_object_info =
{
sizeof (TestObjectClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) test_object_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (TestObject),
0, /* n_preallocs */
(GInstanceInitFunc) test_object_init,
};
test_object_type =
g_type_register_static (G_TYPE_OBJECT, "TestObject",
&test_object_info, 0);
}
return test_object_type;
}
static void
test_object_class_init (TestObjectClass *klass)
{
GObjectClass *object_class;
GParamSpec *param_spec;
object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->set_property = test_object_set_property;
object_class->get_property = test_object_get_property;
param_spec = g_param_spec_string ("bar", NULL, NULL,
NULL,
G_PARAM_READABLE | G_PARAM_WRITABLE
#ifdef MAKE_IT_SLOW_2
| G_PARAM_CONSTRUCT_ONLY
#endif
);
g_object_class_install_property (object_class, PROP_BAR, param_spec);
param_spec = g_param_spec_int ("foo", NULL, NULL,
G_MININT, G_MAXINT, 0,
G_PARAM_READABLE | G_PARAM_WRITABLE
#ifdef MAKE_IT_SLOW_2
| G_PARAM_CONSTRUCT_ONLY
#endif
);
g_object_class_install_property (object_class, PROP_FOO, param_spec);
object_class->finalize = test_object_finalize;
}
static void
test_object_init (TestObject *object)
{
object->bar = NULL;
object->foo = 0;
}
static void
test_object_finalize (GObject *object)
{
TestObject *obj;
obj = (TestObject *) (object);
g_free (obj->bar);
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
test_object_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
TestObject *test_object;
test_object = TEST_OBJECT (object);
switch (property_id)
{
case PROP_FOO:
test_object->foo = g_value_get_int (value);
break;
case PROP_BAR:
g_free (test_object->bar);
test_object->bar = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
test_object_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
TestObject *test_object;
test_object = TEST_OBJECT (object);
switch (property_id)
{
case PROP_BAR:
g_value_set_string (value, test_object->bar);
break;
case PROP_FOO:
g_value_set_int (value, test_object->foo);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
TestObject *
test_object_new (void)
{
#ifdef MAKE_IT_SLOW_1
return TEST_OBJECT (g_object_new (test_object_get_type (),
"foo", 5,
"bar", "blah",
NULL));
#else
TestObject *obj =
TEST_OBJECT (g_object_new (test_object_get_type (),
NULL));
obj->foo = 5;
obj->bar = g_strdup ("blah");
return obj;
#endif
}
/*************************/
int main (int argc, char *argv[])
{
GTimeVal start, end;
int i;
TestObject *obj[REPEATS];
g_type_init_with_debug_flags (G_TYPE_DEBUG_NONE);
test_object_new ();
g_get_current_time (&start);
for (i = 0; i < REPEATS; i++)
obj[i] = test_object_new ();
g_get_current_time (&end);
if (end.tv_usec - start.tv_usec < 0)
end.tv_sec--, end.tv_usec += 1000000;
g_print ("loop %d, %ld.%06ld sec\n", REPEATS,
(end.tv_sec - start.tv_sec),
(end.tv_usec - start.tv_usec));
return 0;
}
3. 编译测试代码
Then try:
gcc -Wall -pg -g gobject-test.c -o gobject-test \
`pkg-config --cflags --libs gobject-2.0`
vs.
gcc -DMAKE_IT_SLOW_1 -Wall -pg -g gobject-test.c -o gobject-test \
`pkg-config --cflags gobject-2.0` `pkg-config --libs gobject-2.0`
or
gcc -DMAKE_IT_SLOW_2 -Wall -pg -g gobject-test.c -o gobject-test \
`pkg-config --cflags gobject-2.0` `pkg-config --libs gobject-2.0`
4. 用gprof看看：
gprof -b ./gobject-test
Flat profile:
Each sample counts as 0.01 seconds.
no time accumulated
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
0.00 0.00 0.00 200002 0.00 0.00 test_object_get_type
0.00 0.00 0.00 100001 0.00 0.00 test_object_new
Call graph
granularity: each sample hit covers 2 byte(s) no time propagated
index % time self children called name
0.00 0.00 200002/200002 test_object_new [2]
[1] 0.0 0.00 0.00 200002 test_object_get_type [1]
-----------------------------------------------
0.00 0.00 100001/100001 main [8]
[2] 0.0 0.00 0.00 100001 test_object_new [2]
0.00 0.00 200002/200002 test_object_get_type [1]
-----------------------------------------------
Index by function name
[1] test_object_get_type [2] test_object_new
build again:
gcc -DMAKE_IT_SLOW_1 -Wall -pg -g gobject-test.c -o gobject-test `pkg-config --cflags --libs gobject-2.0`
gprof -b ./gobject-test
Flat profile:
Each sample counts as 0.01 seconds.
% cumulative self self total
time seconds seconds calls ns/call ns/call name
50.12 0.01 0.01 400004 12.53 12.53 test_object_get_type
50.12 0.01 0.01 frame_dummy
0.00 0.01 0.00 100001 0.00 25.06 test_object_new
Call graph
granularity: each sample hit covers 2 byte(s) for 99.77% of 0.01 seconds
index % time self children called name
0.00 0.00 200002/400004 test_object_set_property [5]
0.00 0.00 200002/400004 test_object_new [3]
[1] 50.0 0.01 0.00 400004 test_object_get_type [1]
-----------------------------------------------
<spontaneous>
[2] 50.0 0.01 0.00 frame_dummy [2]
-----------------------------------------------
0.00 0.00 100001/100001 main [4]
[3] 25.0 0.00 0.00 100001 test_object_new [3]
0.00 0.00 200002/400004 test_object_get_type [1]
-----------------------------------------------
<spontaneous>
[4] 25.0 0.00 0.00 main [4]
0.00 0.00 100001/100001 test_object_new [3]
-----------------------------------------------
<spontaneous>
[5] 25.0 0.00 0.00 test_object_set_property [5]
0.00 0.00 200002/400004 test_object_get_type [1]
-----------------------------------------------
Index by function name
[2] frame_dummy [1] test_object_get_type [3] test_object_new
build again:
gcc -DMAKE_IT_SLOW_2 -Wall -pg -g gobject-test.c -o gobject-test `pkg-config --cflags --libs gobject-2.0`
gprof -b ./gobject-test
Flat profile:
Each sample counts as 0.01 seconds.
no time accumulated
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
0.00 0.00 0.00 400004 0.00 0.00 test_object_get_type
0.00 0.00 0.00 100001 0.00 0.00 test_object_new
Call graph
granularity: each sample hit covers 2 byte(s) no time propagated
index % time self children called name
0.00 0.00 200002/400004 test_object_set_property [14]
0.00 0.00 200002/400004 test_object_new [2]
[1] 0.0 0.00 0.00 400004 test_object_get_type [1]
-----------------------------------------------
0.00 0.00 100001/100001 main [8]
[2] 0.0 0.00 0.00 100001 test_object_new [2]
0.00 0.00 200002/400004 test_object_get_type [1]
-----------------------------------------------
Index by function name
[1] test_object_get_type [2] test_object_new
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