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/*
This file is part of GNUnet.
(C) 2001, 2002, 2003, 2004, 2006 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file util/test_scheduler_delay.c
* @brief testcase for delay of scheduler, measures how
* precise the timers are. Expect values between 10 and 20 ms on
* modern machines.
*/
#include "platform.h"
#include "gnunet_common.h"
#include "gnunet_scheduler_lib.h"
#include "gnunet_time_lib.h"
#define VERBOSE GNUNET_NO
static struct GNUNET_TIME_Absolute target;
static int i;
static unsigned long long cumDelta;
#define INCR 47
#define MAXV 1500
/**
* Signature of the main function of a task.
*
* @param cls closure
* @param tc context
*/
static void
test_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct GNUNET_TIME_Absolute now;
now = GNUNET_TIME_absolute_get ();
if (now.abs_value > target.abs_value)
cumDelta += (now.abs_value - target.abs_value);
else
cumDelta += (target.abs_value - now.abs_value);
target =
GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply
(GNUNET_TIME_UNIT_MILLISECONDS, i));
FPRINTF (stderr, "%s", ".");
if (i > MAXV)
{
FPRINTF (stderr, "%s", "\n");
return;
}
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
(GNUNET_TIME_UNIT_MILLISECONDS, i), &test_task,
NULL);
i += INCR;
}
static int
check ()
{
target = GNUNET_TIME_absolute_get ();
GNUNET_SCHEDULER_run (&test_task, NULL);
FPRINTF (stdout, "Sleep precision: %llu ms. ",
cumDelta / 1000 / (MAXV / INCR));
if (cumDelta <= 10 * MAXV / INCR)
FPRINTF (stdout, "%s", "Timer precision is excellent.\n");
else if (cumDelta <= 50 * MAXV / INCR) /* 50 ms average deviation */
FPRINTF (stdout, "%s", "Timer precision is good.\n");
else if (cumDelta > 250 * MAXV / INCR)
FPRINTF (stdout, "%s", "Timer precision is awful.\n");
else
FPRINTF (stdout, "%s", "Timer precision is acceptable.\n");
return 0;
}
int
main (int argc, char *argv[])
{
int ret;
GNUNET_log_setup ("test-scheduler-delay", "WARNING", NULL);
ret = check ();
return ret;
}
/* end of test_scheduler_delay.c */
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