public static LongHistogram GetNewHistogram()
{
LongHistogram histo = new LongHistogram(1, 2, NUMBER_SIGNIFICANT_DIGITS);
histo.Reset();
return(histo);
}
public void TestReset()
{
var longHistogram = new LongHistogram(HighestTrackableValue, NumberOfSignificantValueDigits);
longHistogram.RecordValue(TestValueLevel);
longHistogram.Reset();
Assert.AreEqual(0L, longHistogram.GetCountAtValue(TestValueLevel));
Assert.AreEqual(0L, longHistogram.TotalCount);
}
public void Run(Program.Options options)
{
_runCount = options.RunCount ?? 3;
Console.WriteLine($"Latency Test to run => {_perfTestType.FullName}, Runs => {_runCount}");
_test = (ILatencyTest)Activator.CreateInstance(_perfTestType);
CheckProcessorsRequirements(_test);
Console.WriteLine("Starting");
var stopwatch = new Stopwatch();
var histogram = new LongHistogram(10000000000L, 4);
for (var i = 0; i < _runCount; i++)
{
stopwatch.Reset();
histogram.Reset();
GC.Collect();
GC.WaitForPendingFinalizers();
var beforeGen0Count = GC.CollectionCount(0);
var beforeGen1Count = GC.CollectionCount(1);
var beforeGen2Count = GC.CollectionCount(2);
Exception exception = null;
LatencyTestSessionResult result = null;
try
{
_test.Run(stopwatch, histogram);
}
catch (Exception ex)
{
exception = ex;
}
if (exception != null)
{
result = new LatencyTestSessionResult(exception);
}
else
{
var gen0Count = GC.CollectionCount(0) - beforeGen0Count;
var gen1Count = GC.CollectionCount(1) - beforeGen1Count;
var gen2Count = GC.CollectionCount(2) - beforeGen2Count;
result = new LatencyTestSessionResult(histogram, stopwatch.Elapsed, gen0Count, gen1Count, gen2Count);
}
Console.WriteLine(result);
_results.Add(result);
}
}
private static void RunClient(IFeedClient client)
{
var histogram = new LongHistogram(TimeSpan.FromSeconds(10).Ticks, 2);
var receivedMessageCount = 0;
void OnMessageReceived(ReadOnlySpan <byte> message)
{
var now = Stopwatch.GetTimestamp();
var start = Unsafe.ReadUnaligned <long>(ref MemoryMarshal.GetReference(message));
var rrt = now - start;
var latencyInMicroseconds = unchecked (rrt * 1_000_000 / (double)Stopwatch.Frequency);
receivedMessageCount++;
histogram.RecordValue((long)latencyInMicroseconds);
}
using (client)
{
var connectedSignal = new AutoResetEvent(false);
client.Connected += () => Console.WriteLine($"Connected {connectedSignal.Set()}");
client.MessageReceived += OnMessageReceived;
client.Start("client " + Guid.NewGuid());
connectedSignal.WaitOne();
do
{
Console.WriteLine("Bench? (<message count> <message size> <delay in micro> <burst>, eg.: 100000 128 10 1)");
var benchArgs = Console.ReadLine();
if (!TryParseBenchArgs(benchArgs, out var args))
{
break;
}
histogram.Reset();
RunBench(client, args, ref receivedMessageCount);
histogram.OutputPercentileDistribution(Console.Out, 1);
Console.WriteLine("FailSends : " + Counters.FailedReceivingNextCount);
Console.WriteLine("FailReceives : " + Counters.FailedReceivingNextCount);
Counters.Reset();
} while (true);
client.Stop();
}
}
public static void Main()
{
var ctx = new Aeron.Context()
.AvailableImageHandler(AvailablePongImageHandler);
var fragmentAssembler = new FragmentAssembler(HandlerHelper.ToFragmentHandler(PongHandler));
Console.WriteLine("Publishing Ping at " + PingChannel + " on stream Id " + PingStreamID);
Console.WriteLine("Subscribing Pong at " + PongChannel + " on stream Id " + PongStreamID);
Console.WriteLine("Message length of " + MessageLength + " bytes");
using (var aeron = Aeron.Connect(ctx))
{
Console.WriteLine("Warming up... " + WarmupNumberOfIterations + " iterations of " + WarmupNumberOfMessages + " messages");
using (var publication = aeron.AddPublication(PingChannel, PingStreamID))
using (var subscription = aeron.AddSubscription(PongChannel, PongStreamID))
using (var byteBuffer = BufferUtil.AllocateDirectAligned(MessageLength, BitUtil.CACHE_LINE_LENGTH))
using (var atomicBuffer = new UnsafeBuffer(byteBuffer))
{
Latch.Wait();
for (var i = 0; i < WarmupNumberOfIterations; i++)
{
RoundTripMessages(atomicBuffer, fragmentAssembler, publication, subscription, WarmupNumberOfMessages);
}
Thread.Sleep(100);
do
{
Histogram.Reset();
Console.WriteLine("Pinging " + NumberOfMessages + " messages");
RoundTripMessages(atomicBuffer, fragmentAssembler, publication, subscription, NumberOfMessages);
Console.WriteLine("Histogram of RTT latencies in microseconds.");
Histogram.OutputPercentileDistribution(Console.Out, outputValueUnitScalingRatio: 1000);
} while (Console.Read() == 'y');
}
}
}
public void TestReset()
{
var longHistogram = new LongHistogram(HighestTrackableValue, NumberOfSignificantValueDigits);
longHistogram.RecordValue(TestValueLevel);
longHistogram.Reset();
Assert.AreEqual(0L, longHistogram.GetCountAtValue(TestValueLevel));
Assert.AreEqual(0L, longHistogram.TotalCount);
}
private void StartLoop(int messageSize, int delayMicros, int burst)
{
_cts = new CancellationTokenSource();
var histogram = new LongHistogram(TimeSpan.FromSeconds(10).Ticks, 2);
void FeedClientOnMessageReceived(ReadOnlySpan <byte> bytes)
{
var now = Stopwatch.GetTimestamp();
var count = Interlocked.Increment(ref _messageCounter);
if (count <= _warmupSkipCount)
{
return;
}
var start = Unsafe.ReadUnaligned <long>(ref MemoryMarshal.GetReference(bytes));
var rrt = now - start;
var micros = (long)(rrt * 1_000_000.0 / Stopwatch.Frequency);
if (!_cts.IsCancellationRequested)
{
histogram.RecordValue(micros);
}
}
_feedClientManual.MessageReceived += FeedClientOnMessageReceived;
histogram.Reset();
_messageCounter = 0;
var buffer = new byte[messageSize];
for (var i = 0; i < buffer.Length; i++)
{
buffer[i] = 42;
}
var rateReporter = Task.Run(async() =>
{
var previousCount = 0L;
while (!_cts.IsCancellationRequested)
{
var count = Volatile.Read(ref _messageCounter);
var countPerSec = count - previousCount;
previousCount = count;
Console.WriteLine($"Processed messages: {countPerSec:N0}, total: {count:N0} [GC 0:{GC.CollectionCount(0)} 1:{GC.CollectionCount(1)}]");
await Task.Delay(1000);
}
});
while (!_cts.IsCancellationRequested)
{
_sw.Restart();
for (int i = 0; i < burst; i++)
{
Unsafe.WriteUnaligned(ref buffer[0], Stopwatch.GetTimestamp());
_feedClientManual.Send(buffer);
}
NOP(delayMicros / 1000_000.0);
}
_feedClientManual.MessageReceived -= FeedClientOnMessageReceived;
rateReporter.Wait();
histogram.OutputPercentileDistribution(Console.Out, 1);
using var writer = new StreamWriter(Path.Combine(_outFolder, $"Latency_{messageSize}_{delayMicros}.hgrm"));
histogram.OutputPercentileDistribution(writer);
}
