| // 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. |
| |
| // 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<dynamic>.filled(260, null)); |
| arrays.add(new List<dynamic>.filled(1, null)); |
| } |
| // 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<dynamic>.filled(300, null)); |
| } |
| } |