2 This file is part of GNUnet.
3 Copyright (C) 2001-2013 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
16 * @file util/test_scheduler_delay.c
17 * @brief testcase for delay of scheduler, measures how
18 * precise the timers are. Expect values between 0.2 and 2 ms on
22 #include "gnunet_util_lib.h"
24 static struct GNUNET_TIME_Absolute target;
28 static unsigned long long cumDelta;
36 * Signature of the main function of a task.
43 struct GNUNET_TIME_Absolute now;
45 now = GNUNET_TIME_absolute_get ();
46 if (now.abs_value_us > target.abs_value_us)
47 cumDelta += (now.abs_value_us - target.abs_value_us);
49 cumDelta += (target.abs_value_us - now.abs_value_us);
51 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply
52 (GNUNET_TIME_UNIT_MICROSECONDS, i));
53 FPRINTF (stderr, "%s", ".");
56 FPRINTF (stderr, "%s", "\n");
59 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
60 (GNUNET_TIME_UNIT_MICROSECONDS, i),
68 main (int argc, char *argv[])
70 GNUNET_log_setup ("test-scheduler-delay",
73 target = GNUNET_TIME_absolute_get ();
74 GNUNET_SCHEDULER_run (&test_task, NULL);
76 "Sleep precision: %llu microseconds (average delta). ",
77 cumDelta / (MAXV / INCR));
78 if (cumDelta <= 500 * MAXV / INCR)
79 FPRINTF (stdout, "%s", "Timer precision is excellent.\n");
80 else if (cumDelta <= 5000 * MAXV / INCR) /* 5 ms average deviation */
81 FPRINTF (stdout, "%s", "Timer precision is good.\n");
82 else if (cumDelta > 25000 * MAXV / INCR)
83 FPRINTF (stdout, "%s", "Timer precision is awful.\n");
85 FPRINTF (stdout, "%s", "Timer precision is acceptable.\n");
89 /* end of test_scheduler_delay.c */