| /* |
| * Copyright (C) 2015 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. |
| */ |
| package android.surfacecomposition; |
| |
| import android.util.Log; |
| |
| /** |
| * This task will simulate CPU activity by consuming memory bandwidth from the system. |
| * Note: On most system the CPU and GPU will share the same memory. |
| */ |
| public class MemoryAccessTask { |
| private final static String TAG = "MemoryAccessTask"; |
| private final static int BUFFER_SIZE = 32 * 1024 * 1024; |
| private final static int BUFFER_STEP = 256; |
| private boolean mStopRequested; |
| private WorkThread mThread; |
| private final Object mLock = new Object(); |
| |
| public class WorkThread extends Thread { |
| public void run() { |
| byte[] memory = new byte[BUFFER_SIZE]; |
| while (true) { |
| synchronized (mLock) { |
| if (mStopRequested) { |
| break; |
| } |
| } |
| long result = 0; |
| for (int index = 0; index < BUFFER_SIZE; index += BUFFER_STEP) { |
| result += ++memory[index]; |
| } |
| Log.v(TAG, "Processing...:" + result); |
| } |
| } |
| } |
| |
| public void start() { |
| if (mThread != null) { |
| throw new RuntimeException("Work thread is already started"); |
| } |
| mStopRequested = false; |
| mThread = new WorkThread(); |
| mThread.start(); |
| } |
| |
| public void stop() { |
| if (mThread != null) { |
| synchronized (mLock) { |
| mStopRequested = true; |
| } |
| try { |
| mThread.join(); |
| } catch (InterruptedException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |