gprof 看看gobject的效率,API调用。

os posted @ 2013年8月22日 14:17 in gprof , 1051 阅读

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

登录 *


loading captcha image...
(输入验证码)
or Ctrl+Enter