diff options
Diffstat (limited to 'ACE/tests/High_Res_Timer_Test.cpp')
| -rw-r--r-- | ACE/tests/High_Res_Timer_Test.cpp | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/ACE/tests/High_Res_Timer_Test.cpp b/ACE/tests/High_Res_Timer_Test.cpp new file mode 100644 index 00000000000..6dc70ced6f8 --- /dev/null +++ b/ACE/tests/High_Res_Timer_Test.cpp @@ -0,0 +1,188 @@ +// $Id$ +//============================================================================ +// +// = LIBRARY +// tests +// +// = FILENAME +// High_Res_Timer_Test.cpp +// +// = DESCRIPTION +// 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; +} |