2 This file is part of GNUnet.
3 (C) 2001, 2002, 2003, 2004, 2006 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 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 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file util/test_scheduler_delay.c
22 * @brief testcase for delay of scheduler, measures how
23 * precise the timers are. Expect values between 10 and 20 ms on
27 #include "gnunet_common.h"
28 #include "gnunet_scheduler_lib.h"
29 #include "gnunet_time_lib.h"
31 static struct GNUNET_TIME_Absolute target;
35 static unsigned long long cumDelta;
42 * Signature of the main function of a task.
48 test_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
50 struct GNUNET_TIME_Absolute now;
52 now = GNUNET_TIME_absolute_get ();
53 if (now.abs_value > target.abs_value)
54 cumDelta += (now.abs_value - target.abs_value);
56 cumDelta += (target.abs_value - now.abs_value);
58 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply
59 (GNUNET_TIME_UNIT_MILLISECONDS, i));
60 FPRINTF (stderr, "%s", ".");
63 FPRINTF (stderr, "%s", "\n");
66 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
67 (GNUNET_TIME_UNIT_MILLISECONDS, i), &test_task,
74 main (int argc, char *argv[])
76 GNUNET_log_setup ("test-scheduler-delay", "WARNING", NULL);
77 target = GNUNET_TIME_absolute_get ();
78 GNUNET_SCHEDULER_run (&test_task, NULL);
79 FPRINTF (stdout, "Sleep precision: %llu ms. ",
80 cumDelta / 1000 / (MAXV / INCR));
81 if (cumDelta <= 10 * MAXV / INCR)
82 FPRINTF (stdout, "%s", "Timer precision is excellent.\n");
83 else if (cumDelta <= 50 * MAXV / INCR) /* 50 ms average deviation */
84 FPRINTF (stdout, "%s", "Timer precision is good.\n");
85 else if (cumDelta > 250 * MAXV / INCR)
86 FPRINTF (stdout, "%s", "Timer precision is awful.\n");
88 FPRINTF (stdout, "%s", "Timer precision is acceptable.\n");
92 /* end of test_scheduler_delay.c */