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#region License
// The PostgreSQL License
//
// Copyright (C) 2015 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
namespace Npgsql.Tests
{
/// <summary>
/// Keep track of metrics related to performance.
/// </summary>
internal sealed class TestMetrics : IDisposable
{
private static Process process = Process.GetCurrentProcess();
private bool running;
/// <summary>
/// The number of iterations accumulated.
/// </summary>
public int Iterations { get; private set; }
private TimeSpan systemCPUTime;
private TimeSpan userCPUTime;
private Stopwatch stopwatch;
private TimeSpan allowedTime;
private bool reportOnStop;
private TestMetrics(TimeSpan allowedTime, bool reportOnStop)
{
Iterations = 0;
systemCPUTime = process.PrivilegedProcessorTime;
userCPUTime = process.UserProcessorTime;
stopwatch = Stopwatch.StartNew();
this.allowedTime = allowedTime;
this.reportOnStop = reportOnStop;
running = true;
}
/// <summary>
/// Construct and start a new TestMetrics object.
/// </summary>
/// <param name="allowedTime">Length of time the test should run.</param>
/// <param name="reportOnStop">Report metrics to stdout when stopped.</param>
/// <returns>A new running TestMetrics object.</returns>
public static TestMetrics Start(TimeSpan allowedTime, bool reportOnStop)
{
return new TestMetrics(allowedTime, reportOnStop);
}
/// <summary>
/// Incremnent the Iterations value by one.
/// </summary>
public void IncrementIterations()
{
Iterations++;
}
/// <summary>
/// Stop the internal stop watch and record elapsed CPU times.
/// </summary>
public void Stop()
{
if (! running)
{
return;
}
stopwatch.Stop();
systemCPUTime = process.PrivilegedProcessorTime - systemCPUTime;
userCPUTime = process.UserProcessorTime - userCPUTime;
running = false;
if (reportOnStop)
{
Console.WriteLine("Elapsed: {0:mm\\:ss\\.ff}", ElapsedClockTime);
Console.WriteLine("CPU: {0:mm\\:ss\\.ffffff} (User: {1:mm\\:ss\\.ffffff}, System: {2:mm\\:ss\\.ffffff})", ElapsedTotalCPUTime, ElapsedUserCPUTime, ElapsedSystemCPUTime);
Console.WriteLine("Iterations: {0}; {1:0.00}/second, {2:0.00}/CPU second", Iterations, IterationsPerSecond(), IterationsPerCPUSecond());
}
}
/// <summary>
/// Stop the internal stop watch and record elapsed CPU times.
/// </summary>
public void Dispose()
{
Stop();
}
/// <summary>
/// Report whether ElapsedClockTime has met or exceeded the maximum run time.
/// </summary>
public bool TimesUp
{
get { return (stopwatch.Elapsed >= allowedTime); }
}
/// <summary>
/// Calculate the number of iterations accumulated per the time span provided.
/// </summary>
/// <param name="timeSpan"></param>
/// <returns>The number of iterations accumulated per the time span provided.</returns>
public double IterationsPer(TimeSpan timeSpan)
{
return (double)Iterations / ((double)stopwatch.Elapsed.TotalMilliseconds / (double)timeSpan.TotalMilliseconds);
}
/// <summary>
/// Calculate the number of iterations accumulated per second.
/// Equivelent to calling IterationsPer(new TimeSpan(0, 0, 1)).
/// </summary>
/// <returns>The number of iterations accumulated per second.</returns>
public double IterationsPerSecond()
{
return IterationsPer(new TimeSpan(0, 0, 1));
}
/// <summary>
/// Calculate the number of iterations accumulated per the CPU time span provided.
/// </summary>
/// <param name="timeSpan"></param>
/// <returns>The number of iterations accumulated per the CPU time span provided.</returns>
public double IterationsPerCPU(TimeSpan timeSpan)
{
return (double)Iterations / ((double)ElapsedTotalCPUTime.TotalMilliseconds / (double)timeSpan.TotalMilliseconds);
}
/// <summary>
/// Calculate the number of iterations accumulated per CPU second.
/// Equivelent to calling IterationsPerCPU(new TimeSpan(0, 0, 1)).
/// </summary>
/// <param name="timeSpan"></param>
/// <returns>The number of iterations accumulated per CPU second.</returns>
public double IterationsPerCPUSecond()
{
return IterationsPerCPU(new TimeSpan(0, 0, 1));
}
/// <summary>
/// Elapsed time since start.
/// </summary>
public TimeSpan ElapsedClockTime
{
get { return stopwatch.Elapsed; }
}
/// <summary>
/// Elapsed system CPU time since start.
/// </summary>
public TimeSpan ElapsedSystemCPUTime
{
get
{
if (running)
{
return process.PrivilegedProcessorTime - systemCPUTime;
}
else
{
return systemCPUTime;
}
}
}
/// <summary>
/// Elapsed user CPU time since start.
/// </summary>
public TimeSpan ElapsedUserCPUTime
{
get
{
if (running)
{
return process.UserProcessorTime - userCPUTime;
}
else
{
return userCPUTime;
}
}
}
/// <summary>
/// Elapsed total (system + user) CPU time since start.
/// </summary>
public TimeSpan ElapsedTotalCPUTime
{
get { return ElapsedSystemCPUTime + ElapsedUserCPUTime; }
}
}
}