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// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
// Deliberately fragment the heap and test that GC peformance does not
// break down. See https://github.com/dart-lang/sdk/issues/29588
// Normally runs in about 6-7 seconds on an x64 machine, using about 2.5Gbytes
// of memory.
//
// This test is deliberately CPU-light and so it can make a lot of
// progress before the concurrent sweepers are done sweeping the heap.
// In that time there is no freelist and so the issue does not arise.
// VMOptions=--no_concurrent_mark --no_concurrent_sweep
// VMOptions=--no_concurrent_mark --concurrent_sweep
// VMOptions=--no_concurrent_mark --use_compactor
// VMOptions=--no_concurrent_mark --use_compactor --force_evacuation
// VMOptions=--concurrent_mark --no_concurrent_sweep
// VMOptions=--concurrent_mark --concurrent_sweep
// VMOptions=--concurrent_mark --use_compactor
// VMOptions=--concurrent_mark --use_compactor --force_evacuation
// VMOptions=--scavenger_tasks=0
// VMOptions=--scavenger_tasks=1
// VMOptions=--scavenger_tasks=2
// VMOptions=--scavenger_tasks=3
main() {
final List<List> arrays = [];
// Fill up heap with alternate large-small items.
for (int i = 0; i < 500000; i++) {
arrays.add(new List(260));
arrays.add(new List(1));
}
// Clear the large items so that the heap is full of 260-word gaps.
for (int i = 0; i < arrays.length; i += 2) {
arrays[i] = null;
}
// Allocate a lot of 300-word objects that don't fit in the gaps.
for (int i = 0; i < 600000; i++) {
arrays.add(new List(300));
}
}