Update

Author: pbernet

src/main/scala/sample/stream/FlightDelayStreaming.scala

@@ -33,10 +33,9 @@ import scala.util.{Failure, Success, Try}
   *
   * Typical results on 2012 vintage MacBook Pro with 8 cores
   * with default dispatcher and default JVM param:
-  * JDK 11.0.11    41 seconds
-  * JDK 17.0.2     33 seconds
-  * JDK 21.0.3     27 seconds
-  * graalvm-jdk-21 25 seconds
+  * temurin-11     31 seconds
+  * temurin-21     21 seconds
+  * graalvm-jdk-21 18 seconds
   *
   * Doc:
   * https://fullgc.github.io/how-to-tune-akka-to-get-the-most-from-your-actor-based-system-part-1
@@ -48,7 +47,7 @@ object FlightDelayStreaming extends App {
 
   import system.dispatcher
 
-  val sourceOfLines = FileIO.fromPath(Paths.get("src/main/resources/2008.csv"))
+  val sourceOfLines = FileIO.fromPath(Paths.get("src/main/resources/2008_subset.csv"))
     .via(Framing.delimiter(ByteString(System.lineSeparator), maximumFrameLength = 1024, allowTruncation = true)
       .map(_.utf8String))
 
@@ -66,15 +65,15 @@ object FlightDelayStreaming extends App {
   val filterAndConvert: Flow[FlightEvent, FlightDelayRecord, NotUsed] =
   Flow[FlightEvent]
     .filter(r => Try(r.arrDelayMins.toInt).getOrElse(-1) > 0) // convert arrival delays to ints, filter out non delays
-    .mapAsyncUnordered(parallelism = 2) { r =>
+    .mapAsyncUnordered(parallelism = 100_000) { r =>
       Future(FlightDelayRecord(r.year, r.month, r.dayOfMonth, r.flightNum, r.uniqueCarrier, r.arrDelayMins))
       }
 
   // Aggregate number of delays and totalMins
   val averageCarrierDelay: Flow[FlightDelayRecord, FlightDelayAggregate, NotUsed] =
     Flow[FlightDelayRecord]
       // maxSubstreams must be larger than the number of UniqueCarrier in the file
-      .groupBy(30, _.uniqueCarrier, allowClosedSubstreamRecreation = true)
+      .groupBy(100, _.uniqueCarrier, allowClosedSubstreamRecreation = true)
       //.wireTap(each => println(s"Processing FlightDelayRecord: $each"))
       .fold(FlightDelayAggregate("", 0, 0)) {
         (x: FlightDelayAggregate, y: FlightDelayRecord) =>