Large List's makes Scavenger slow

[andersjohnsen]

I have a small test-program that initializes and uses a large list:

import("dart:isolate");

foo() {
  var b = new ByteArray(1024 * 1024);
  void m() {
    b;
    var port = new ReceivePort();
    port.receive((message, reply) {
      port.close();
      foo();
    });
    port.toSendPort().call(null);
  }
  m();
}

main() => foo();

With --verbose-gc I can see that it takes Scavenger 361647us to run. If I change the list to ByteArray, it's running at only 1769us.

Thank you!,

• Anders

[iposva-google]

Not very surprising to me at the current non-tuned state: The scavenger has 1048576 at least more object pointers to traverse in the List case.

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Set owner to @iposva-google.
Removed Priority-Medium label.
Added Priority-Low, Accepted labels.

[iposva-google]

When using a List and the latest release Dart VM I get scavenges on the order of 300us.

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Added Fixed label.