blob: 005f0df3d05097312e753ecf081765ec5fc1d938 [file] [log] [blame]
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
public class Main {
private static int exhaustJavaHeap(Object[] data, int index, int size) {
Runtime.getRuntime().gc();
while (size > 0) {
try {
data[index] = new byte[size];
index++;
} catch (OutOfMemoryError e) {
size /= 2;
}
}
return index;
}
public static void main(String[] args) {
Class klass = Other.class;
Object[] data = new Object[100000];
try {
System.out.println("Filling heap");
// Make sure that there is no reclaimable memory in the heap. Otherwise we may throw
// OOME to prevent GC thrashing, even if later allocations may succeed.
Runtime.getRuntime().gc();
System.runFinalization();
// NOTE: There is a GC invocation in the exhaustJavaHeap(). So we don't need one here.
int index = 0;
int initial_size = 256 * 1024 * 1024;
// Repeat to ensure there is no space left on the heap.
index = exhaustJavaHeap(data, index, initial_size);
index = exhaustJavaHeap(data, index, /*size*/ 4);
index = exhaustJavaHeap(data, index, /*size*/ 4);
// Initialize now that the heap is full.
Other.print();
} catch (OutOfMemoryError e) {
} catch (Exception e) {
System.out.println(e);
}
}
}