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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if STRESS
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.Linq;
namespace ReactiveTests.Stress
{
public static class Helpers
{
public static void RunWithMemoryPressure(int minBytes, int maxBytes, double activePercent, Action a)
{
var started = new ManualResetEvent(false);
var stopped = 0;
var avg = (minBytes + maxBytes) / 2;
var MIN = avg / 1000;
var MAX = avg / 10;
var allocator = new Thread(() =>
{
var rand = new Random();
var roots = new List<byte[]>();
var bytes = 0;
while (bytes < avg)
{
var n = rand.Next(MIN, MAX);
bytes += n;
roots.Add(new byte[n]);
}
started.Set();
long avgSum = 0;
long count = 0;
const int DEC = 0;
const int INC = 1;
var trendPhase = 0;
var trendLength = 0;
while (Thread.VolatileRead(ref stopped) == 0)
{
if (trendLength-- == 0)
{
trendPhase = rand.Next(0, 1000) % 2;
trendLength = rand.Next(1, 10);
}
var mem = TimeSpan.Zero;
var sw = Stopwatch.StartNew();
var busy = new Stopwatch();
while (Thread.VolatileRead(ref stopped) == 0 && (double)mem.Ticks / (double)sw.ElapsedTicks < activePercent)
{
busy.Restart();
var runFor = rand.Next(10, 100);
while (busy.ElapsedMilliseconds < runFor)
{
if (trendPhase == INC)
{
if (bytes < maxBytes)
{
var n = rand.Next(MIN, MAX);
bytes += n;
roots.Add(new byte[n]);
continue;
}
else
{
trendPhase = DEC;
}
}
if (trendPhase == DEC)
{
if (bytes > minBytes)
{
if (roots.Count > 0)
{
var i = rand.Next(0, roots.Count);
bytes -= roots[i].Length;
roots.RemoveAt(i);
}
continue;
}
else
{
trendPhase = INC;
}
}
}
mem += busy.Elapsed;
}
var sleepFor = rand.Next(100, 1000);
Thread.Sleep(sleepFor);
avgSum += bytes;
count++;
//Console.WriteLine(bytes + " - Avg = " + avgSum / count);
}
});
allocator.Start();
started.WaitOne();
try
{
a();
}
finally
{
Interlocked.Exchange(ref stopped, 1);
allocator.Join();
}
}
public static void RunWithProcessorPressure(int threadCount, int lockCount, double activePercent, double lockChancePercent, Action a)
{
var stopped = 0;
var started = new CountdownEvent(threadCount);
var ts = new Thread[threadCount];
var locks = Enumerable.Range(0, lockCount).Select(_ => new object()).ToArray();
for (int i = 0; i < threadCount; i++)
{
var id = i;
var t = ts[i] = new Thread(() =>
{
var rand = new Random();
started.Signal();
var sw = Stopwatch.StartNew();
var run = TimeSpan.Zero;
while (Thread.VolatileRead(ref stopped) == 0)
{
var busy = new Stopwatch();
while (Thread.VolatileRead(ref stopped) == 0 && (double)run.Ticks / (double)sw.ElapsedTicks < activePercent)
{
busy.Restart();
const int RUN = 0;
const int BLOCK = 1;
var action = lockCount > 0 && rand.Next() % 100 <= lockChancePercent * 100 ? BLOCK : RUN;
switch (action)
{
case RUN:
//Console.WriteLine("~" + id);
while (busy.ElapsedMilliseconds < 10)
;
break;
case BLOCK:
//Console.WriteLine("!" + id);
lock (locks[rand.Next(0, lockCount)])
Thread.Sleep(rand.Next(100, 1000));
break;
}
run += busy.Elapsed;
}
Thread.Sleep(rand.Next(100, 1000));
}
});
t.Start();
}
started.Wait();
try
{
a();
}
finally
{
Interlocked.Exchange(ref stopped, 1);
foreach (var t in ts)
t.Join();
}
}
public static void SleepOrSpin(int ms)
{
if (ms == 0)
return;
if (ms % 2 == 0)
{
var sw = Stopwatch.StartNew();
while (sw.Elapsed.TotalMilliseconds < ms)
;
}
else
Thread.Sleep(ms);
}
}
}
#endif
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