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// $Id: Latency_Stats.h 80826 2008-03-04 14:51:23Z wotte $
class Latency_Stats
{
public:
Latency_Stats (void);
void dump_results (const ACE_TCHAR* test_name,
const ACE_TCHAR* sub_test);
void sample (ACE_hrtime_t sample);
void accumulate (const Latency_Stats& stats);
// Useful to merge several Latency_Stats.
private:
u_long n_;
ACE_hrtime_t sum_;
ACE_hrtime_t sum2_;
ACE_hrtime_t min_;
ACE_hrtime_t max_;
};
inline
Latency_Stats::Latency_Stats (void)
: n_ (0),
sum_ (0),
sum2_ (0),
min_ (0),
max_ (0)
{
}
inline void
Latency_Stats::sample (ACE_hrtime_t sample)
{
this->sum_ += sample;
#ifndef ACE_LACKS_LONGLONG_T
this->sum2_ += sample * sample;
#else
// possible loss of precision here due to lack of 64bit support
this->sum2_ += sample * sample.lo();
#endif
if (this->n_ == 0)
{
this->min_ = sample;
this->max_ = sample;
}
if (this->min_ > sample)
this->min_ = sample;
if (this->max_ < sample)
this->max_ = sample;
this->n_++;
}
inline void
Latency_Stats::dump_results (const ACE_TCHAR *test_name,
const ACE_TCHAR *sub_test)
{
if (this->n_ < 1)
return;
ACE_hrtime_t avg = this->sum_ / this->n_;
#ifndef ACE_LACKS_LONGLONG_T
ACE_hrtime_t dev =
this->sum2_ / this->n_ - avg*avg;
#else
ACE_hrtime_t dev =
this->sum2_ / this->n_ - avg.lo()*avg.lo();
#endif
ACE_UINT32 gsf = ACE_High_Res_Timer::global_scale_factor ();
double min_usec = ACE_CU64_TO_CU32 (this->min_) / gsf;
double max_usec = ACE_CU64_TO_CU32 (this->max_) / gsf;
double avg_usec = ACE_CU64_TO_CU32 (avg) / gsf;
double dev_usec = ACE_CU64_TO_CU32 (dev) / (gsf * gsf);
ACE_DEBUG ((LM_DEBUG,
"%s/%s: %.2f/%.2f/%.2f/%.2f (min/avg/max/var^2) [usecs]\n",
test_name, sub_test,
min_usec, avg_usec, max_usec, dev_usec));
}
inline void
Latency_Stats::accumulate (const Latency_Stats& rhs)
{
if (rhs.n_ == 0)
return;
if (this->n_ == 0)
{
this->n_ = rhs.n_;
this->min_ = rhs.min_;
this->max_ = rhs.max_;
this->sum_ = rhs.sum_;
this->sum2_ = rhs.sum2_;
return;
}
if (this->min_ > rhs.min_)
this->min_ = rhs.min_;
if (this->max_ < rhs.max_)
this->max_ = rhs.max_;
this->sum_ += rhs.sum_;
this->sum2_ += rhs.sum2_;
this->n_ += rhs.n_;
}
class Throughput_Stats
{
public:
Throughput_Stats (void);
void dump_results (const ACE_TCHAR* test_name,
const ACE_TCHAR* sub_test);
void sample (void);
// An event has been received
void accumulate (const Throughput_Stats& stats);
// Useful to merge several Throughput_Stats.
private:
u_long n_;
ACE_hrtime_t start_;
ACE_hrtime_t stop_;
};
inline void
Throughput_Stats::accumulate (const Throughput_Stats& rhs)
{
if (rhs.n_ == 0)
return;
if (this->n_ == 0)
{
this->start_ = rhs.start_;
this->stop_ = rhs.stop_;
this->n_ = rhs.n_;
return;
}
if (this->start_ > rhs.start_)
this->start_ = rhs.start_;
if (this->stop_ < rhs.stop_)
this->stop_ = rhs.stop_;
this->n_ += rhs.n_;
}
inline void
Throughput_Stats::dump_results (const ACE_TCHAR *test_name,
const ACE_TCHAR *subtest)
{
if (this->n_ == 0)
{
ACE_DEBUG ((LM_DEBUG,
"%s/%s: no events recorded\n",
test_name, subtest));
return;
}
ACE_Time_Value tv;
ACE_High_Res_Timer::hrtime_to_tv (tv, this->stop_ - this->start_);
double f = 1.0/(tv.sec () + tv.usec () / 1000000.0);
double events_per_second = this->n_ * f;
ACE_DEBUG ((LM_DEBUG,
"%s/%s: "
"%d / %d.%06.6d = %.3f events/second\n",
test_name, subtest,
this->n_,
tv.sec (), tv.usec (),
events_per_second));
}
inline
Throughput_Stats::Throughput_Stats (void)
: n_ (0),
start_ (),
stop_ ()
{
}
inline void
Throughput_Stats::sample (void)
{
if (this->n_ == 0)
{
this->start_ = ACE_OS::gethrtime ();
}
this->n_++;
this->stop_ = ACE_OS::gethrtime ();
}
inline void
move_to_rt_class (void)
{
// Enable FIFO scheduling, e.g., RT scheduling class on Solaris.
int priority =
(ACE_Sched_Params::priority_min (ACE_SCHED_FIFO)
+ ACE_Sched_Params::priority_max (ACE_SCHED_FIFO)) / 2;
int result = ACE_OS::sched_params (ACE_Sched_Params (ACE_SCHED_FIFO,
priority,
ACE_SCOPE_PROCESS));
if (result == 0)
{
result = ACE_OS::thr_setprio (priority);
}
if (result != 0)
{
ACE_DEBUG ((LM_DEBUG,
"Cannot move program to realtime class.\n"));
}
}
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