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//=============================================================================
/**
* @file High_Res_Timer_Test.cpp
*
* Simple test of ACE_High_Res_Timer.
*
* @author David L. Levine <levine@cs.wustl.edu>
*/
//=============================================================================
#include "test_config.h"
#include "ace/Log_Msg.h"
#include "ace/High_Res_Timer.h"
#include "ace/Sched_Params.h"
#include "ace/Get_Opt.h"
#include "ace/OS_NS_unistd.h"
static
u_int
check (const time_t interval, const time_t measured)
{
time_t const threshold = 25 /* percent */;
time_t const difference =
interval > measured ? interval - measured : measured - interval;
time_t const percentage_difference = difference * 100 / interval;
if (percentage_difference < threshold)
return 0;
else
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("The measured time of %Q differs from ")
ACE_TEXT ("the interval of %Q by %Q percent.\n"),
measured,
interval,
percentage_difference),
1);
}
// Does a sanity check of the microseconds vs nanoseconds. They're supposed
// to represent the same interval.
static u_int
check_micro_nano (ACE_hrtime_t microinterval, ACE_hrtime_t nanointerval)
{
ACE_hrtime_t const threshold = 8 /* promille */;
microinterval *= 1000u;
ACE_hrtime_t const difference = (microinterval > nanointerval
? (microinterval - nanointerval)
: (nanointerval - microinterval));
if (nanointerval == 0)
{
nanointerval = 1; // Prevent divide-by-zero
}
ACE_hrtime_t const promille_difference =
difference * 1000 / nanointerval;
if ((promille_difference < threshold) || (difference < 1500))
{
return 0;
}
else
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("The microseconds * 1000 of %Q ")
ACE_TEXT ("differs from the nanoseconds of %Q ")
ACE_TEXT (" by %Q promille\n"),
microinterval,
nanointerval,
promille_difference),
1);
}
static
ACE_Time_Value
time_interval (const ACE_Time_Value &interval,
ACE_hrtime_t& nanoseconds,
ACE_hrtime_t& microseconds)
{
ACE_High_Res_Timer timer;
timer.start ();
ACE_OS::sleep (interval);
timer.stop ();
ACE_Time_Value measured;
timer.elapsed_time (measured);
timer.elapsed_time (nanoseconds);
timer.elapsed_microseconds (microseconds);
return measured;
}
static u_int const intervals[] =
{0, 1, 10, 100, 1000, 10000, 100000, 1000000, 4000000}; /*usec*/
int
run_main (int argc, ACE_TCHAR *argv[])
{
ACE_START_TEST (ACE_TEXT ("High_Res_Timer_Test"));
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("The ACE_High_Res_Timer scale factor is %u ")
ACE_TEXT ("1/microsecond\n"),
ACE_High_Res_Timer::global_scale_factor ()));
u_int errors = 0;
u_int iterations = 1;
ACE_Get_Opt getoptarg (argc, argv, ACE_TEXT ("i:"));
for (int c; (c = getoptarg ()) != -1; )
{
switch (c)
{
case 'i':
iterations = ACE_OS::atoi (getoptarg.opt_arg ());
break;
}
}
// We don't check for errors if the interval is shorter than this
// value because the OS has a finite resolution anyway.
static u_int const TIMER_RESOLUTION = 10000;
for (u_int i = 0; i < sizeof intervals / sizeof (u_int); ++i)
{
for (u_int j = 0; j < iterations; ++j)
{
ACE_Time_Value const interval (0, intervals[i]);
ACE_hrtime_t nanoseconds;
ACE_hrtime_t microseconds;
ACE_Time_Value const measured = time_interval (interval,
nanoseconds,
microseconds);
time_t const interval_usec =
interval.sec () * ACE_ONE_SECOND_IN_USECS + interval.usec ();
time_t const measured_usec =
measured.sec () * ACE_ONE_SECOND_IN_USECS + measured.usec ();
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("interval: %: usec, measured: %: usec %s\n"),
interval_usec,
measured_usec,
(intervals[i] <= TIMER_RESOLUTION
? ACE_TEXT (" (interval and measured may differ)")
: ACE_TEXT (""))));
if (intervals[i] > TIMER_RESOLUTION)
{
errors += check (interval.sec () * ACE_ONE_SECOND_IN_USECS
+ interval.usec (),
measured.sec () * ACE_ONE_SECOND_IN_USECS
+ measured.usec ());
// Don't check for error for intervals below 10 msec.
}
// Check the ACE_Timer_Value-calculated microseconds against
// the ACE_High_Res_Timer-calculated nanoseconds.
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("ACE_Time_Value usec: %:, ACE_HR nsec: %Q\n"),
measured_usec,
nanoseconds));
// This gives problems -> should be fixed
errors += check_micro_nano (measured.sec () * ACE_ONE_SECOND_IN_USECS
+ measured.usec (),
nanoseconds);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("ACE_High_Res_Timer usec: %Q, nsec: %Q\n"),
microseconds,
nanoseconds));
// Now check the ACE_High_Res_Timer-calculated values against
// each other.
errors += check_micro_nano (microseconds, nanoseconds);
}
}
ACE_END_TEST;
return errors == 0 ? 0 : 1;
}
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