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ACE_Throughput_Stats Class Reference

A simple class to make throughput and latency analysis. More...

#include <Throughput_Stats.h>

Inheritance diagram for ACE_Throughput_Stats:

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Collaboration diagram for ACE_Throughput_Stats:

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List of all members.

Public Member Functions

 ACE_Throughput_Stats (void)
 Constructor.

void sample (ACE_UINT64 throughput, ACE_UINT64 latency)
 Store one sample.

void accumulate (const ACE_Throughput_Stats &throughput)
 Update the values to reflect the stats in throughput.

void dump_results (const ACE_TCHAR *msg, ACE_UINT32 scale_factor)
 Print down the stats.


Static Public Member Functions

void dump_throughput (const ACE_TCHAR *msg, ACE_UINT32 scale_factor, ACE_UINT64 elapsed_time, ACE_UINT32 samples_count)
 Dump the average throughput stats.


Private Attributes

ACE_UINT64 throughput_last_
 The last throughput measurement.

Detailed Description

A simple class to make throughput and latency analysis.

Keep the relevant information to perform throughput and latency analysis, including:

  1. Minimum, Average and Maximum latency
  2. Jitter for the latency
  3. Linear regression for throughput
  4. Accumulate results from several samples to obtain aggregated results, across several threads or experiments.

Todo:
The idea behind this class was to use linear regression to determine if the throughput was linear or exhibited jitter. Unfortunately it never worked quite right, so only average throughput is computed.

Definition at line 45 of file Throughput_Stats.h.

Constructor & Destructor Documentation

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_Throughput_Stats::ACE_Throughput_Stats (  void   ) 
 

Constructor.

Definition at line 14 of file Throughput_Stats.cpp. 

00015   : ACE_Basic_Stats ()
00016   , throughput_last_ (0)
00017 #if 0
00018   // @@TODO: This is what I really wanted to compute, but it just
00019   // does not work.
00020   , throughput_sum_x_ (0)
00021   , throughput_sum_x2_ (0)
00022   , throughput_sum_y_ (0)
00023   , throughput_sum_y2_ (0)
00024   , throughput_sum_xy_ (0)
00025 #endif /* 0 */
00026 {
00027 }

Member Function Documentation

void ACE_Throughput_Stats::accumulate (  const ACE_Throughput_Stats &  throughput  ) 
 

Update the values to reflect the stats in throughput.

Definition at line 70 of file Throughput_Stats.cpp.

References ACE_Basic_Stats::accumulate(), ACE_Basic_Stats::samples_count(), and throughput_last_. 

00071 {
00072   if (rhs.samples_count () == 0u)
00073     return;
00074 
00075   this->ACE_Basic_Stats::accumulate (rhs);
00076 
00077   if (this->samples_count () == 0u)
00078     {
00079       this->throughput_last_   = rhs.throughput_last_;
00080 #if 0
00081       // @@TODO: This is what I really wanted to compute, but it just
00082       // does not work.
00083       this->throughput_sum_x_  = rhs.throughput_sum_x_;
00084       this->throughput_sum_x2_ = rhs.throughput_sum_x2_;
00085       this->throughput_sum_y_  = rhs.throughput_sum_y_;
00086       this->throughput_sum_y2_ = rhs.throughput_sum_y2_;
00087       this->throughput_sum_xy_ = rhs.throughput_sum_xy_;
00088 #endif /* 0 */
00089 
00090       return;
00091     }
00092 
00093 
00094   if (this->throughput_last_ < rhs.throughput_last_)
00095     this->throughput_last_ = rhs.throughput_last_;
00096 
00097 #if 0
00098   // @@TODO: This is what I really wanted to compute, but it just
00099   // does not work.
00100   this->throughput_sum_x_  += rhs.throughput_sum_x_;
00101   this->throughput_sum_x2_ += rhs.throughput_sum_x2_;
00102   this->throughput_sum_y_  += rhs.throughput_sum_y_;
00103   this->throughput_sum_y2_ += rhs.throughput_sum_y2_;
00104   this->throughput_sum_xy_ += rhs.throughput_sum_xy_;
00105 #endif /* 0 */
00106 }

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

Print down the stats.

Definition at line 109 of file Throughput_Stats.cpp.

References ACE_DEBUG, ACE_TCHAR, ACE_TEXT, ACE_Basic_Stats::dump_results(), dump_throughput(), LM_DEBUG, and ACE_Basic_Stats::samples_count(). 

00111 {
00112   if (this->samples_count () == 0u)
00113     {
00114       ACE_DEBUG ((LM_DEBUG,
00115                   ACE_TEXT ("%s : no data collected\n"), msg));
00116       return;
00117     }
00118 
00119   this->ACE_Basic_Stats::dump_results (msg, sf);
00120 
00121   ACE_Throughput_Stats::dump_throughput (msg, sf,
00122                                          this->throughput_last_,
00123                                          this->samples_count ());
00124 
00125 #if 0
00126   // @@TODO: This is what I really wanted to generate, but it just
00127   // doesn't work.
00128   double t_sum_x =
00129     ACE_CU64_TO_CU32 (this->throughput_sum_x_);// / sf);
00130   //t_sum_x /= 1000000.0;
00131   double t_sum_y =
00132     ACE_CU64_TO_CU32 (this->throughput_sum_y_);
00133   double t_sum_x2 =
00134     ACE_CU64_TO_CU32 (this->throughput_sum_x2_);// / (sf*sf));
00135   //t_sum_x2 /= 1000000.0;
00136   //t_sum_x2 /= 1000000.0;
00137   double t_sum_y2 =
00138     ACE_CU64_TO_CU32 (this->throughput_sum_y2_);
00139   double t_sum_xy =
00140     ACE_CU64_TO_CU32 (this->throughput_sum_xy_);// / sf);
00141   //t_sum_xy /= 1000000.0;
00142   double t_avgx = t_sum_x / this->samples_count ();
00143   double t_avgy = t_sum_y / this->samples_count ();
00144 
00145   double t_a =
00146     (this->samples_count () * t_sum_xy - t_sum_x * t_sum_y)
00147     / (this->samples_count () * t_sum_x2 - t_sum_x * t_sum_x);
00148   double t_b = (t_avgy - t_a * t_avgx);
00149 
00150   t_a *= 1000000.0;
00151 
00152   double d_r =
00153     (t_sum_xy - t_avgx * t_sum_y - t_avgy * t_sum_x
00154      + this->samples_count () * t_avgx * t_avgy);
00155   double n_r =
00156     (t_sum_x2
00157      - this->samples_count () * t_avgx * t_avgx)
00158     * (t_sum_y2
00159        - this->samples_count () * t_avgy * t_avgy);
00160   double t_r = d_r * d_r / n_r;
00161 
00162   //  ACE_DEBUG ((LM_DEBUG,
00163   //              "%s throughput: %.2f/%.2f/%.2f/%.6f/%.2f (avg/a/b/r/elapsed)\n",
00164   //              msg, t_avg, t_a, t_b, t_r, seconds));
00165   //  ACE_DEBUG ((LM_DEBUG,
00166   //              "%s        data: %.2f/%.2f/%.2f/%.6f/%.2f (x/x2/y/y2/xy)\n",
00167   //              msg, t_sum_x, t_sum_x2, t_sum_y, t_sum_y2, t_sum_xy));
00168 #endif
00169 }

void ACE_Throughput_Stats::dump_throughput (  const ACE_TCHAR *  msg,
ACE_UINT32  scale_factor,
ACE_UINT64  elapsed_time,
ACE_UINT32  samples_count
)  [static]
 

Dump the average throughput stats.

Definition at line 172 of file Throughput_Stats.cpp.

References ACE_DEBUG, ACE_HR_SCALE_CONVERSION, ACE_TCHAR, ACE_TEXT, ACE_UINT64, ACE_UINT64_DBLCAST_ADAPTER, and LM_DEBUG.

Referenced by dump_results(). 

00176 {
00177 #ifndef ACE_NLOGGING
00178   double seconds =
00179 # if defined ACE_LACKS_LONGLONG_T
00180     elapsed_time / sf;
00181 #elif  defined (ACE_LACKS_UNSIGNEDLONGLONG_T)
00182     static_cast<double> (ACE_UINT64_DBLCAST_ADAPTER (
00183                            ACE_U_LongLong(elapsed_time / sf)));
00184 # else  /* ! ACE_LACKS_LONGLONG_T */
00185     static_cast<double> (ACE_UINT64_DBLCAST_ADAPTER (elapsed_time / sf));
00186 # endif /* ! ACE_LACKS_LONGLONG_T */
00187   seconds /= ACE_HR_SCALE_CONVERSION;
00188 
00189   const double t_avg = samples_count / seconds;
00190 
00191   ACE_DEBUG ((LM_DEBUG,
00192               ACE_TEXT ("%s throughput: %.2f (events/second)\n"),
00193               msg, t_avg));
00194 #else
00195   ACE_UNUSED_ARG (msg);
00196   ACE_UNUSED_ARG (sf);
00197   ACE_UNUSED_ARG (elapsed_time);
00198   ACE_UNUSED_ARG (samples_count);
00199 #endif /* ACE_NLOGGING */
00200 }

void ACE_Throughput_Stats::sample (  ACE_UINT64  throughput,
ACE_UINT64  latency
) 
 

Store one sample.

Definition at line 30 of file Throughput_Stats.cpp.

References ACE_UINT64, ACE_OS::printf(), ACE_Basic_Stats::sample(), ACE_Basic_Stats::samples_count(), and throughput_last_. 

00032 {
00033   this->ACE_Basic_Stats::sample (latency);
00034 
00035   if (this->samples_count () == 1u)
00036     {
00037 
00038       this->throughput_last_   = throughput;
00039 #if 0
00040       // @@TODO: This is what I really wanted to compute, but it just
00041       // does not work.
00042       this->throughput_sum_y_  = this->samples_count_;
00043       this->throughput_sum_y2_ = this->samples_count_ * this->samples_count_;
00044       this->throughput_sum_x_  = throughput;
00045       this->throughput_sum_x2_ = throughput * throughput;
00046       this->throughput_sum_xy_ = throughput * this->samples_count_;
00047 
00048       ACE_OS::printf ("%f %qu\n", throughput / 400000000.0, this->samples_count_);
00049 #endif /* 0 */
00050     }
00051   else
00052     {
00053       this->throughput_last_ = throughput;
00054 
00055 #if 0
00056       // @@TODO: This is what I really wanted to compute, but it just
00057       // does not work.
00058       this->throughput_sum_y_  += this->samples_count_;
00059       this->throughput_sum_y2_ += this->samples_count_ * this->samples_count_;
00060       this->throughput_sum_x_  += throughput;
00061       this->throughput_sum_x2_ += throughput * throughput;
00062       this->throughput_sum_xy_ += throughput * this->samples_count_;
00063 
00064       ACE_OS::printf ("%f %qu\n", throughput / 400000000.0, this->samples_count_);
00065 #endif /* 0 */
00066     }
00067 }

Member Data Documentation

ACE_UINT64 ACE_Throughput_Stats::throughput_last_ [private]
 

The last throughput measurement.

Definition at line 67 of file Throughput_Stats.h.

Referenced by accumulate(), and sample().

The documentation for this class was generated from the following files:
Generated on Sun Jan 27 12:58:44 2008 for ACE by doxygen 1.3.6