In this recipe, we show you that the Dart VM uses multiple cores on a processor without having to specify anything to the VM. This allows a much better performance and throughput than if a Dart app could only use one processor.
Look at the following code for many_cores.dart (in the project using_isolates):
import'dart:isolate';
main() {
int counter = 0;
ReceivePortreceivePort = new ReceivePort();
receivePort.listen((msg) {
if (msg is SendPort) {
msg.send(counter++);
} else {
print(msg);
}
});
// starting isolates:
for (var i = 0; i < 5; i++) {
Isolate.spawn(runInIsolate, receivePort.sendPort);
}
}
// code to run isolates
runInIsolate(SendPortsendPort) {
ReceivePortreceivePort = new ReceivePort();
// send own sendPort to main isolate:
sendPort.send(receivePort.sendPort);
receivePort.listen((msg) {
var k = 0;
var max = (5 - msg) * 500000000;
for (var i = 0; i < max; ++i) {
i = ++i - 1...