1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 import java.lang.reflect.Method; 18 import java.util.ArrayList; 19 import java.util.List; 20 21 public class Main { 22 23 public static void main(String[] args) throws Exception { 24 // Setup reflection stuff before allocating to prevent OOME caused by allocations from 25 // Class.forName or getDeclaredMethod. 26 // Reflective equivalent of: dalvik.system.VMRuntime.getRuntime().clearGrowthLimit(); 27 final Class<?> vm_runtime = Class.forName("dalvik.system.VMRuntime"); 28 final Method get_runtime = vm_runtime.getDeclaredMethod("getRuntime"); 29 final Object runtime = get_runtime.invoke(null); 30 final Method clear_growth_limit = vm_runtime.getDeclaredMethod("clearGrowthLimit"); 31 32 int alloc1 = allocateTillOOME(); 33 34 // Proactively clean up. 35 Runtime.getRuntime().gc(); 36 37 // Expand the heap to the maximum size. 38 clear_growth_limit.invoke(runtime); 39 40 int alloc2 = allocateTillOOME(); 41 42 if (alloc1 > alloc2) { 43 System.out.println("ERROR: Allocated less memory after growth" + 44 "limit cleared (" + alloc1 + " MBs > " + alloc2 + " MBs"); 45 } else { 46 System.out.println("Test complete"); 47 } 48 } 49 50 private static int allocateTillOOME() { 51 int allocations = 0; 52 List<byte[]> l = new ArrayList<byte[]>(); 53 try { 54 while (true) { 55 // Allocate a MB at a time 56 l.add(new byte[1048576]); 57 allocations++; 58 } 59 } catch (OutOfMemoryError e) { 60 // Help clean up. 61 l.clear(); 62 } 63 return allocations; 64 } 65 } 66
