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ACE_Basic_Stats Class Reference

Collect basic stats about a series of samples. More...

#include <Basic_Stats.h>

Inheritance diagram for ACE_Basic_Stats:

Inheritance graph
[legend]
List of all members.

Public Member Functions

 ACE_Basic_Stats (void)
 Constructor.

ACE_UINT32 samples_count (void) const
 The number of samples received so far.

void sample (ACE_UINT64 value)
 Record one sample.

void accumulate (const ACE_Basic_Stats &rhs)
 Update the values to reflect the stats in rhs.

void dump_results (const ACE_TCHAR *msg, ACE_UINT32 scale_factor) const
 Dump all the samples.


Public Attributes

ACE_UINT32 samples_count_
 The number of samples.

ACE_UINT64 min_
 The minimum value.

ACE_UINT32 min_at_
 The number of the sample that had the minimum value.

ACE_UINT64 max_
 The maximum value.

ACE_UINT32 max_at_
 The number of the sample that had the maximum value.

ACE_UINT64 sum_
 The sum of all the values.

Detailed Description

Collect basic stats about a series of samples.

Compute the average and standard deviation (aka jitter) for an arbitrary number of samples, using constant space. Normally used for latency statistics.

Definition at line 32 of file Basic_Stats.h.

Constructor & Destructor Documentation

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE ACE_Basic_Stats::ACE_Basic_Stats (  void   ) 
 

Constructor.

The number of samples is pre-allocated, and cannot changes once the class is initialized.

Definition at line 8 of file Basic_Stats.inl. 

00009   : samples_count_ (0)
00010   , min_ (0)
00011   , min_at_ (0)
00012   , max_ (0)
00013   , max_at_ (0)
00014   , sum_ (0)
00015 {
00016 }

Member Function Documentation

ACE_BEGIN_VERSIONED_NAMESPACE_DECL void ACE_Basic_Stats::accumulate (  const ACE_Basic_Stats &  rhs  ) 
 

Update the values to reflect the stats in rhs.

Definition at line 17 of file Basic_Stats.cpp.

References max_, max_at_, min_, min_at_, samples_count_, and sum_.

Referenced by ACE_Throughput_Stats::accumulate(). 

00018 {
00019   if (rhs.samples_count_ == 0)
00020     return;
00021 
00022   if (this->samples_count_ == 0)
00023     {
00024       this->min_ = rhs.min_;
00025       this->min_at_ = rhs.min_at_;
00026 
00027       this->max_ = rhs.max_;
00028       this->max_at_ = rhs.max_at_;
00029     }
00030   else
00031     {
00032       if (this->min_ > rhs.min_)
00033         {
00034           this->min_ = rhs.min_;
00035           this->min_at_ = rhs.min_at_;
00036         }
00037       if (this->max_ < rhs.max_)
00038         {
00039           this->max_ = rhs.max_;
00040           this->max_at_ = rhs.max_at_;
00041         }
00042     }
00043 
00044   this->samples_count_ += rhs.samples_count_;
00045   this->sum_ += rhs.sum_;
00046 }

void ACE_Basic_Stats::dump_results (  const ACE_TCHAR *  msg,
ACE_UINT32  scale_factor
)  const
 

Dump all the samples.

Prints out the results, using msg as a prefix for each message and scaling all the numbers by scale_factor. The latter is useful because high resolution timer samples are acquired in clock ticks, but often presented in microseconds.

Definition at line 49 of file Basic_Stats.cpp.

References ACE_DEBUG, ACE_LIB_TEXT, ACE_TCHAR, ACE_UINT64, LM_DEBUG, max_, min_, samples_count(), samples_count_, and sum_.

Referenced by ACE_Throughput_Stats::dump_results(). 

00051 {
00052 #ifndef ACE_NLOGGING
00053   if (this->samples_count () == 0u)
00054     {
00055       ACE_DEBUG ((LM_DEBUG,
00056                   ACE_LIB_TEXT ("%s : no data collected\n"), msg));
00057       return;
00058     }
00059 
00060   ACE_UINT64 avg = this->sum_ / this->samples_count_;
00061 
00062   ACE_UINT64 l_min = this->min_ / sf;
00063   ACE_UINT64 l_max = this->max_ / sf;
00064   ACE_UINT64 l_avg = avg / sf;
00065 
00066   ACE_DEBUG ((LM_DEBUG,
00067               ACE_LIB_TEXT ("%s latency   : %Q[%d]/%Q/%Q[%d] (min/avg/max)\n"),
00068               msg,
00069               l_min, this->min_at_,
00070               l_avg,
00071               l_max, this->max_at_));
00072 
00073 #endif /* ACE_NLOGGING */
00074 }

ACE_INLINE void ACE_Basic_Stats::sample (  ACE_UINT64  value  ) 
 

Record one sample.

Definition at line 25 of file Basic_Stats.inl.

References ACE_UINT64, max_, max_at_, min_, min_at_, samples_count_, and sum_.

Referenced by ACE_Sample_History::collect_basic_stats(), and ACE_Throughput_Stats::sample(). 

00026 {
00027   ++this->samples_count_;
00028 
00029   if (this->samples_count_ == 1u)
00030     {
00031       this->min_ = value;
00032       this->min_at_ = this->samples_count_;
00033       this->max_ = value;
00034       this->max_at_ = this->samples_count_;
00035     }
00036   else
00037     {
00038       if (this->min_ > value)
00039         {
00040           this->min_ = value;
00041           this->min_at_ = this->samples_count_;
00042         }
00043       if (this->max_ < value)
00044         {
00045           this->max_ = value;
00046           this->max_at_ = this->samples_count_;
00047         }
00048     }
00049 
00050   this->sum_ += value;
00051 }

ACE_INLINE ACE_UINT32 ACE_Basic_Stats::samples_count (  void   )  const
 

The number of samples received so far.

Definition at line 19 of file Basic_Stats.inl.

References samples_count_.

Referenced by ACE_Throughput_Stats::accumulate(), ACE_Throughput_Stats::dump_results(), dump_results(), and ACE_Throughput_Stats::sample(). 

00020 {
00021   return this->samples_count_;
00022 }

Member Data Documentation

ACE_UINT64 ACE_Basic_Stats::max_
 

The maximum value.

Definition at line 71 of file Basic_Stats.h.

Referenced by accumulate(), dump_results(), and sample().

ACE_UINT32 ACE_Basic_Stats::max_at_
 

The number of the sample that had the maximum value.

Definition at line 74 of file Basic_Stats.h.

Referenced by accumulate(), and sample().

ACE_UINT64 ACE_Basic_Stats::min_
 

The minimum value.

Definition at line 65 of file Basic_Stats.h.

Referenced by accumulate(), dump_results(), and sample().

ACE_UINT32 ACE_Basic_Stats::min_at_
 

The number of the sample that had the minimum value.

Definition at line 68 of file Basic_Stats.h.

Referenced by accumulate(), and sample().

ACE_UINT32 ACE_Basic_Stats::samples_count_
 

The number of samples.

Definition at line 62 of file Basic_Stats.h.

Referenced by accumulate(), dump_results(), sample(), and samples_count().

ACE_UINT64 ACE_Basic_Stats::sum_
 

The sum of all the values.

Definition at line 77 of file Basic_Stats.h.

Referenced by accumulate(), dump_results(), and sample().

The documentation for this class was generated from the following files:
Generated on Thu Nov 9 11:20:20 2006 for ACE by doxygen 1.3.6