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-/* -*- C++ -*- */
-// $Id$
-
-// ============================================================================
-//
-// = LIBRARY
-// ace
-//
-// = FILENAME
-// Stats.h
-//
-// = AUTHORS
-// David L. Levine
-//
-// ============================================================================
-
-#ifndef ACE_STATS_H
-#define ACE_STATS_H
-#include "ace/pre.h"
-
-#include "ace/ACE.h"
-
-#if !defined (ACE_LACKS_PRAGMA_ONCE)
-# pragma once
-#endif /* ACE_LACKS_PRAGMA_ONCE */
-
-#include "ace/Containers.h"
-#include "ace/Log_Msg.h"
-
-class ACE_Export ACE_Stats_Value
-{
- // = TITLE
- // Helper class for ACE_Stats.
- //
- // = DESCRIPTION
- // Container struct for 64-bit signed quantity and its
- // precision. It would be nicer to use a fixed-point class, but
- // this is sufficient. Users typically don't need to use this
- // class directly; see ACE_Stats below.
-public:
- ACE_Stats_Value (const u_int precision);
- // Constructor, which requires precision in terms of number of
- // decimal digits. The more variation in the data, and the greater
- // the data values, the smaller the precision must be to avoid
- // overflow in the standard deviation calculation. 3 might be a
- // good value, or maybe 4. 5 will probably be too large for
- // non-trivial data sets.
-
- u_int precision (void) const;
- // Accessor for precision.
-
- void whole (const ACE_UINT32);
- // Set the whole_ field.
-
- ACE_UINT32 whole (void) const;
- // Accessor for the whole_ field.
-
- void fractional (const ACE_UINT32);
- // Set the fractional_ field.
-
- ACE_UINT32 fractional (void) const;
- // Accessor for the fractional_ field.
-
- ACE_UINT32 fractional_field (void) const;
- // Calculates the maximum value of the fractional portion, given its
- // precision.
-
- void scaled_value (ACE_UINT64 &) const;
- // Access the value as an _unsigned_ 64 bit quantity. It scales the
- // value up by <precision> decimal digits, so that no precision will
- // be lost. It assumes that <whole_> is >= 0.
-
- void dump (void) const;
- // Print to stdout.
-
-private:
- ACE_UINT32 whole_;
- // The integer portion of the value.
-
- ACE_UINT32 fractional_;
- // The fractional portion of the value.
-
- u_int precision_;
- // The number of decimal digits of precision represented by
- // <fractional_>. Not declared const, so the only way to change it
- // is via the assignment operator.
-
- ACE_UNIMPLEMENTED_FUNC (ACE_Stats_Value (void))
-};
-
-class ACE_Export ACE_Stats
-{
- // = TITLE
- // Provides simple statistical analysis.
- //
- // = DESCRIPTION
- // Simple statistical analysis package. Prominent features are:
- // 1) It does not use any floating point arithmetic.
- // 2) It handles positive and/or negative sample values. The
- // sample value type is ACE_INT32.
- // 3) It uses 64 bit unsigned, but not 64 bit signed, quantities
- // internally.
- // 4) It checks for overflow of internal state.
- // 5) It has no static variables of other than built-in types.
- //
- // Example usage:
- // ACE_Stats stats;
- // for (u_int i = 0; i < n; ++i)
- // {
- // const ACE_UINT32 sample = /* ... */;
- // stats.sample (sample);
- // }
- // stats.print_summary (3);
-public:
- ACE_Stats (void);
- // Default constructor.
-
- int sample (const ACE_INT32 value);
- // Provide a new sample. Returns 0 on success, -1 if it fails due
- // to running out of memory, or to rolling over of the sample count.
-
- ACE_UINT32 samples (void) const;
- // Access the number of samples provided so far.
-
- ACE_INT32 min_value (void) const;
- // Value of the minimum sample provided so far.
-
- ACE_INT32 max_value (void) const;
- // Value of the maximum sample provided so far.
-
- void mean (ACE_Stats_Value &mean,
- const ACE_UINT32 scale_factor = 1);
- // Access the mean of all samples provided so far. The fractional
- // part is to the specified number of digits. E.g., 3 fractional
- // digits specifies that the fractional part is in thousandths.
-
- int std_dev (ACE_Stats_Value &std_dev,
- const ACE_UINT32 scale_factor = 1);
- // Access the standard deviation, whole and fractional parts. See
- // description of <mean> method for argument descriptions.
-
- int print_summary (const u_int precision,
- const ACE_UINT32 scale_factor = 1,
- FILE * = stdout) const;
- // Print summary statistics. If scale_factor is not 1, then the
- // results are divided by it, i.e., each of the samples is scaled
- // down by it. If internal overflow is reached with the specified
- // scale factor, it successively tries to reduce it. Returns -1 if
- // there is overflow even with a 0 scale factor.
-
- void reset (void);
- // Initialize internal state.
-
- static void quotient (const ACE_UINT64 dividend,
- const ACE_UINT32 divisor,
- ACE_Stats_Value &quotient);
- // Utility division function, for ACE_UINT64 dividend.
-
- static void quotient (const ACE_Stats_Value &dividend,
- const ACE_UINT32 divisor,
- ACE_Stats_Value &quotient);
- // Utility division function, for ACE_Stats_Value dividend.
-
- static void square_root (const ACE_UINT64 n,
- ACE_Stats_Value &square_root);
- // Sqrt function, which uses an oversimplified version of Newton's
- // method. It's not fast, but it doesn't require floating point
- // support.
-
- void dump (void) const;
- // Print summary statistics to stdout.
-
-private:
- u_int overflow_;
- // Internal indication of whether there has been overflow. Contains
- // the errno corresponding to the cause of overflow.
-
- ACE_UINT32 number_of_samples_;
- // Number of samples.
-
- ACE_INT32 min_;
- // Minimum sample value.
-
- ACE_INT32 max_;
- // Maximum sample value.
-
- ACE_Unbounded_Queue <ACE_INT32> samples_;
- // The samples.
-};
-
-// ****************************************************************
-
-class ACE_Export ACE_Throughput_Stats
-{
- // = TITLE
- // A simple class to make throughput and latency analysis.
- //
- // = DESCRIPTION
- // 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.
- //
-public:
- ACE_Throughput_Stats (void);
- // Default 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
-
-private:
- ACE_UINT64 samples_count_;
- // The number of samples
-
- ACE_UINT64 latency_min_;
- ACE_UINT32 latency_min_at_;
- ACE_UINT64 latency_max_;
- ACE_UINT32 latency_max_at_;
- ACE_UINT64 latency_sum_;
- ACE_UINT64 latency_sum2_;
- // The stadigraphs for latency computation
-
- ACE_UINT64 throughput_last_;
- ACE_UINT64 throughput_sum_x_;
- ACE_UINT64 throughput_sum_x2_;
- ACE_UINT64 throughput_sum_y_;
- ACE_UINT64 throughput_sum_y2_;
- ACE_UINT64 throughput_sum_xy_;
- // The stadigraphs for throughput computation
-};
-
-
-#if defined (__ACE_INLINE__)
-# include "ace/Stats.i"
-#endif /* __ACE_INLINE__ */
-
-#include "ace/post.h"
-#endif /* ! ACE_STATS_H */
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