1 /* 2 * Copyright (C) 2016 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 public class Main { main(String[] args)18 public static void main(String[] args) { 19 // Reserve around 1/4 of the RAM for keeping objects live. 20 long maxMem = Runtime.getRuntime().maxMemory(); 21 Object[] holder = new Object[(int)maxMem / 16]; 22 int count = 0; 23 try { 24 while (true) { 25 holder[count++] = new Object[1025]; // A bit over one page. 26 } 27 } catch (OutOfMemoryError e) {} 28 for (int i = 0; i < count; ++i) { 29 holder[i] = null; 30 } 31 // Make sure the heap can handle allocating large object array. This makes sure that free 32 // pages are correctly coalesced together by the allocator. 33 holder[0] = new Object[(int)maxMem / 8]; 34 } 35 } 36