public async Task <int> ChannelPerf()
{
var channel = CreateChannel();
var itemsToProduce = Capacity / ProducerCount;
var producerFactory = new ProducerFactory(channel.Writer, itemsToProduce);
var subscriberFactory = new ConsumerFactory(channel.Reader);
var prodThread = producerFactory.Start();
var subsThread = subscriberFactory.Start();
await Task.WhenAll(prodThread, subsThread);
return(subsThread.Result);
}