public bool TryGet(T key, out Span <byte> value)
{
_pool.Reset();
if (_map.TryGetValue(key, out var vs))
{
value = _pool.GetSpan(vs.Length);
vs.CopyTo(value);
return(true);
}
else
{
value = Span <byte> .Empty;
return(false);
}
}
private static void DoBenchmark(IPEndPoint endpoint, ILog log)
{
var rand = new Random(); // non-deterministic on purpose
var genWatch = new Stopwatch();
genWatch.Start();
var generator = new CoinGenerator(rand);
generator.GenerateSketches(CoinIoCount);
log.Log(LogSeverity.Info,
$"{CoinIoCount} coin I/Os generated in " + (genWatch.ElapsedMilliseconds / 1000f) + " seconds");
var rawSocket = new Socket(endpoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
rawSocket.Connect(endpoint);
var socket = new SocketLikeAdapter(rawSocket);
EnsureGenesisExists(socket);
var handle = OpenBlock(CommittedBlockId.Genesis, socket, log);
// Process coins
var requestPool = new SpanPool <byte>(1024 * 1024);
var responseBuffer = new Span <byte>(new byte[4096]);
var watch = new Stopwatch();
var commitWatch = new Stopwatch();
var outpointSeed = generator.Random.Next();
for (var i = 0; i < generator.CoinSketches.Length; i++)
{
if (i % EpochSize == 0)
{
watch.Reset();
watch.Start();
}
var sketch = generator.CoinSketches[i];
var outpoint = GetOutpoint(sketch, outpointSeed);
if (sketch.IsProduction)
{
// intended side effect on 'requestPool'
var writeCoinRequest = new ProduceCoinRequest(
new RequestId((uint)i),
ref outpoint,
OutpointFlags.None,
handle,
satoshis: 123,
nLockTime: 42,
scriptSizeInBytes: 100,
requestPool);
var script = writeCoinRequest.Script;
script[0] = (byte)i;
}
if (sketch.IsRead)
{
// intended side effect on 'requestPool'
var readCoinRequest =
new GetCoinRequest(new RequestId((uint)i), ref outpoint, handle, requestPool);
}
if (sketch.IsConsumption)
{
// intended side effect on 'requestPool'
var writeCoinRequest = new ConsumeCoinRequest(
new RequestId((uint)i), ref outpoint, handle, requestPool);
}
if (i % BatchSize == BatchSize - 1)
{
// send all the requests as a batch
socket.Send(requestPool.Allocated());
requestPool.Reset();
for (var j = 0; j < BatchSize; j++)
{
socket.Receive(responseBuffer.Slice(0, 4));
var responseSize = responseBuffer[0];
socket.Receive(responseBuffer.Slice(4, responseSize - 4));
}
}
if (i % EpochSize == EpochSize - 1)
{
watch.Stop();
var nextBlockId = GetBlockId();
commitWatch.Reset();
commitWatch.Start();
CommitBlock(handle, nextBlockId, socket);
commitWatch.Stop();
handle = OpenBlock(nextBlockId, socket, log);
var elapsed = watch.ElapsedMilliseconds / 1000.0; // seconds
var iops = (int)(EpochSize / elapsed);
log.Log(LogSeverity.Info,
$"Epoch {i / EpochSize} at {iops} IOps. Commit in {commitWatch.Elapsed.TotalMilliseconds} ms.");
}
}
}