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 
main(String[] args)23     public static void main(String[] args) throws Exception {
24         int alloc1 = 1;
25         // Setup reflection stuff before allocating to prevent OOME caused by allocations from
26         // Class.forName or getDeclaredMethod.
27         // Reflective equivalent of: dalvik.system.VMRuntime.getRuntime().clearGrowthLimit();
28         final Class<?> vm_runtime = Class.forName("dalvik.system.VMRuntime");
29         final Method get_runtime = vm_runtime.getDeclaredMethod("getRuntime");
30         final Object runtime = get_runtime.invoke(null);
31         final Method clear_growth_limit = vm_runtime.getDeclaredMethod("clearGrowthLimit");
32         List<byte[]> l = new ArrayList<byte[]>();
33         try {
34             while (true) {
35                 // Allocate a MB at a time
36                 l.add(new byte[1048576]);
37                 alloc1++;
38             }
39         } catch (OutOfMemoryError e) {
40             l = null;
41         }
42         // Expand the heap to the maximum size.
43         clear_growth_limit.invoke(runtime);
44         int alloc2 = 1;
45         l = new ArrayList<byte[]>();
46         try {
47             while (true) {
48                 // Allocate a MB at a time
49                 l.add(new byte[1048576]);
50                 alloc2++;
51             }
52         } catch (OutOfMemoryError e2) {
53             l = null;
54             if (alloc1 > alloc2) {
55                 System.out.println("ERROR: Allocated less memory after growth" +
56                     "limit cleared (" + alloc1 + " MBs > " + alloc2 + " MBs");
57                 System.exit(1);
58             }
59         }
60         System.out.println("Test complete");
61     }
62 }
63