Created
November 30, 2023 18:01
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fs2 Stream merge performance vs raw IOs
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| import cats.effect.std.Queue | |
| import cats.effect.{IO, IOApp} | |
| import fs2._ | |
| object StreamMergePerformanceTests extends IOApp.Simple { | |
| def run: IO[Unit] = { | |
| case class Payload(x: Integer) | |
| Queue.bounded[IO, Payload](2).flatMap { q => | |
| val payload = Payload(123) | |
| val n = 5000 | |
| val m = 50 | |
| val consumer = Stream.fromQueueUnterminated(q).drain | |
| //val consumer = Stream.repeatEval(q.take) | |
| val producer = Stream.exec(q.offer(payload)).repeatN(n) | |
| //val producer = Stream.repeatEval(q.offer(payload)).take(n) | |
| val testStreams = producer.concurrently(consumer).compile.drain | |
| val testStreamsCompiled = consumer.compile.drain.background.use(_ => producer.compile.drain) | |
| val testQueues = q.take.foreverM.background.use(_ => q.offer(payload).replicateA_(n)) | |
| IO.print("Concurrent drained streams: ") >> | |
| testStreams.replicateA_(m) >> | |
| testStreams.timed.map(_._1.toMillis).replicateA(m).map(x => x.sum.toDouble / x.size).flatMap(IO.println) >> | |
| IO.print("Drained streams, compiled, concurrently as IOs: ") >> | |
| testStreamsCompiled.replicateA_(m) >> | |
| testStreamsCompiled.timed.map(_._1.toMillis).replicateA(m).map(x => x.sum.toDouble / x.size).flatMap(IO.println) >> | |
| IO.print("Concurrent Queue#offer and Queue#take: ") >> | |
| testQueues.replicateA_(m) >> | |
| testQueues.timed.map(_._1.toMillis).replicateA(m).map(x => x.sum.toDouble / x.size).flatMap(IO.println) | |
| } | |
| } | |
| } |
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Concurrent drained streams: 64.54
Drained streams, compiled, concurrently as IOs: 6.24
Concurrent Queue#offer and Queue#take: 1.42