public async Task SendLargePayloadOnManyChannels()
{
if (await this.ExecuteInIsolationAsync())
{
byte[][] serverBuffers = Enumerable.Range(1, ChannelCount).Select(i => new byte[SegmentSize]).ToArray();
(MultiplexingStream mxServer, MultiplexingStream mxClient) = await Task.WhenAll(
MultiplexingStream.CreateAsync(this.serverPipe, this.TimeoutToken).WithCancellation(this.TimeoutToken),
MultiplexingStream.CreateAsync(this.clientPipe, this.TimeoutToken).WithCancellation(this.TimeoutToken));
await this.WaitForQuietPeriodAsync();
// Warm up
await RunAsync(ChannelCount * 2);
long memory1 = GC.GetTotalMemory(true);
var sw = Stopwatch.StartNew();
await RunAsync(SegmentCount);
sw.Stop();
long memory2 = GC.GetTotalMemory(false);
long allocated = memory2 - memory1;
this.Logger.WriteLine("{0} bytes allocated ({1} per segment)", allocated, allocated / SegmentCount);
this.Logger.WriteLine("{0} bytes transmitted in each of {1} segments in {2}ms on {3} channel(s)", SegmentSize, SegmentCount, sw.ElapsedMilliseconds, ChannelCount);
async Task RunAsync(int segmentCount)
{
Requires.Argument(segmentCount >= ChannelCount, nameof(segmentCount), "Cannot send {0} segments over {1} channels.", segmentCount, ChannelCount);
await Task.WhenAll(
Task.Run(async delegate
{
await Task.WhenAll(
Enumerable.Range(1, ChannelCount).Select(c => Task.Run(async delegate
{
byte[] serverBuffer = serverBuffers[c - 1];
MultiplexingStream.Channel?channel = await mxServer.OfferChannelAsync(string.Empty, this.TimeoutToken).WithCancellation(this.TimeoutToken);
for (int i = 0; i < segmentCount / ChannelCount; i++)
{
await channel.Output.WriteAsync(serverBuffer, this.TimeoutToken);
}
})));
}),
Task.Run(async delegate
{
await Task.WhenAll(
Enumerable.Range(1, ChannelCount).Select(c => Task.Run(async delegate
{
MultiplexingStream.Channel?channel = await mxClient.AcceptChannelAsync(string.Empty, this.TimeoutToken).WithCancellation(this.TimeoutToken);
int expectedTotalBytesRead = segmentCount / ChannelCount * SegmentSize;
int totalBytesRead = 0;
do
{
System.IO.Pipelines.ReadResult readResult = await channel.Input.ReadAsync(this.TimeoutToken);
totalBytesRead += (int)readResult.Buffer.Length;
channel.Input.AdvanceTo(readResult.Buffer.End);
readResult.ScrubAfterAdvanceTo();
}while (totalBytesRead < expectedTotalBytesRead);
Assert.Equal(expectedTotalBytesRead, totalBytesRead);
})));
})).WithCancellation(this.TimeoutToken);
}
}
}
/// <summary> /// Attempt to synchronously read data the <see cref="PipeReader"/>. /// </summary> /// <param name="result">The <see cref="ReadResult"/></param> /// <returns>True if data was available, or if the call was canceled or the writer was completed.</returns> /// <remarks>If the pipe returns false, there's no need to call <see cref="AdvanceTo(SequencePosition, SequencePosition)"/>.</remarks> public abstract bool TryRead(out ReadResult result);
public override bool TryRead(out ReadResult result)
{
return(_pipe.TryRead(out result));
}
public override bool TryRead(out ReadResult result)
{
ThrowIfCompleted();
return(TryReadInternal(InternalTokenSource, out result));
}
public bool TryRead(out ReadResult result)
{
result = default;
return(false);
}