Add test to measure lib overhead

1 files changed, 143 insertions, 0 deletions

diff --git a/test/perf-overhead.c b/test/perf-overhead.c
new file mode 100644
index 0000000..20ca6c3
--- /dev/null
+++ b/test/perf-overhead.c
@@ -0,0 +1,143 @@
+/* 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-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 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[])
+{
+    GError *error = NULL;
+    (void) signal(SIGINT, sigint_handler);
+
+    g_type_init();
+    camera = uca_camera_new("mock", &error);
+
+    if (camera == NULL) {
+        g_print("Couldn't initialize camera\n");
+        return 1;
+    }
+
+    test_synchronous_operation(camera);
+    g_print("\n");
+    test_asynchronous_operation(camera);
+
+    g_object_unref(camera);
+
+    return error != NULL ? 1 : 0;
+}