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Diffstat (limited to 'tools/perf-overhead.c')
| -rw-r--r-- | tools/perf-overhead.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/tools/perf-overhead.c b/tools/perf-overhead.c new file mode 100644 index 0000000..6735e6f --- /dev/null +++ b/tools/perf-overhead.c @@ -0,0 +1,181 @@ +/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu> + (Karlsruhe Institute of Technology) + + This library is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by the + Free Software Foundation; either version 2.1 of the License, or (at your + option) any later version. + + This library 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 Lesser General Public License for more + details. + + You should have received a copy of the GNU Lesser General Public License along + with this library; if not, write to the Free Software Foundation, Inc., 51 + Franklin St, Fifth Floor, Boston, MA 02110, USA */ + +#include <glib-object.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "uca-plugin-manager.h" +#include "uca-camera.h" + +#define handle_error(errno) {if ((errno) != UCA_NO_ERROR) printf("error at <%s:%i>\n", \ + __FILE__, __LINE__);} + +typedef struct { + guint counter; + gsize size; + gpointer destination; +} thread_data; + +static UcaCamera *camera = NULL; + +static void +sigint_handler (int signal) +{ + printf ("Closing down libuca\n"); + uca_camera_stop_recording (camera, NULL); + g_object_unref (camera); + exit (signal); +} + +static void +print_usage (void) +{ + GList *types; + UcaPluginManager *manager; + + manager = uca_plugin_manager_new (); + g_print ("Usage: benchmark [ "); + types = uca_plugin_manager_get_available_cameras (manager); + + if (types == NULL) { + g_print ("] -- no camera plugin found\n"); + return; + } + + for (GList *it = g_list_first (types); it != NULL; it = g_list_next (it)) { + gchar *name = (gchar *) it->data; + if (g_list_next (it) == NULL) + g_print ("%s ]\n", name); + else + g_print ("%s, ", name); + } +} + +static void +test_synchronous_operation (UcaCamera *camera) +{ + GError *error = NULL; + guint width, height, bits; + g_object_get (G_OBJECT (camera), + "sensor-width", &width, + "sensor-height", &height, + "sensor-bitdepth", &bits, + NULL); + + const int pixel_size = bits == 8 ? 1 : 2; + const gsize size = width * height * pixel_size; + const guint n_trials = 10000; + gpointer buffer = g_malloc0(size); + + uca_camera_start_recording (camera, &error); + GTimer *timer = g_timer_new (); + + for (guint n = 0; n < n_trials; n++) + uca_camera_grab (camera, &buffer, &error); + + gdouble total_time = g_timer_elapsed (timer, NULL); + g_timer_stop (timer); + + g_print ("Synchronous data transfer\n"); + g_print (" Bandwidth: %3.2f MB/s\n", size * n_trials / 1024. / 1024. / total_time); + g_print (" Throughput: %3.2f frames/s\n", n_trials / total_time); + + uca_camera_stop_recording (camera, &error); + g_free (buffer); + g_timer_destroy (timer); +} + +static void +grab_func (gpointer data, gpointer user_data) +{ + static GStaticMutex mutex = G_STATIC_MUTEX_INIT; + + thread_data *d = (thread_data *) user_data; + g_memmove (d->destination, data, d->size); + g_static_mutex_lock (&mutex); + d->counter++; + g_static_mutex_unlock (&mutex); +} + +static void +test_asynchronous_operation (UcaCamera *camera) +{ + GError *error = NULL; + guint width, height, bits; + + g_object_get (G_OBJECT (camera), + "sensor-width", &width, + "sensor-height", &height, + "sensor-bitdepth", &bits, + NULL); + + const guint pixel_size = bits == 8 ? 1 : 2; + + thread_data d = { + .counter = 0, + .size = width * height * pixel_size, + .destination = g_malloc0(width * height * pixel_size) + }; + + g_object_set (G_OBJECT (camera), + "transfer-asynchronously", TRUE, + NULL); + + uca_camera_set_grab_func (camera, &grab_func, &d); + uca_camera_start_recording (camera, &error); + g_usleep (G_USEC_PER_SEC); + uca_camera_stop_recording (camera, &error); + + g_print ("Asynchronous data transfer\n"); + g_print (" Bandwidth: %3.2f MB/s\n", d.size * d.counter / 1024. / 1024.); + g_print (" Throughput: %i frames/s\n", d.counter); + + g_free (d.destination); +} + +int +main (int argc, char *argv[]) +{ + UcaPluginManager *manager; + GError *error = NULL; + (void) signal (SIGINT, sigint_handler); + + g_type_init (); + if (argc < 2) { + print_usage (); + return 1; + } + + manager = uca_plugin_manager_new (); + camera = uca_plugin_manager_get_camera (manager, argv[1], &error); + + if (camera == NULL) { + g_print ("Error during initialization: %s\n", error->message); + return 1; + } + + test_synchronous_operation (camera); + g_print ("\n"); + test_asynchronous_operation (camera); + + g_object_unref (camera); + g_object_unref (manager); + + return error != NULL ? 1 : 0; +} |