Merge Android R (rvc-dev-plus-aosp-without-vendor@6692709)

Bug: 166295507
Merged-In: I3d92a6de21a938f6b352ec26dc23420c0fe02b27
Change-Id: Ifdb80563ef042738778ebb8a7581a97c4e3d96e2

1 files changed, 89 insertions, 0 deletions

diff --git a/startop/apps/test/src/CPUIntensiveBenchmarks.java b/startop/apps/test/src/CPUIntensiveBenchmarks.java
new file mode 100644
index 000000000000..19d0b6372c1b
--- /dev/null
+++ b/startop/apps/test/src/CPUIntensiveBenchmarks.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+/**
+ *  A threaded CPU intensive class for use in benchmarks.
+ */
+
+package com.android.startop.test;
+
+import android.app.Activity;
+
+public class CPUIntensiveBenchmarks {
+    public static final int ARRAY_SIZE = 30000;
+    public static int[][] mArray;
+
+    static class WorkerThread extends Thread {
+        int mThreadNumber;
+        WorkerThread(int number) {
+            mThreadNumber = number;
+        }
+        public void run() {
+            final int arrayLength = mArray[mThreadNumber].length;
+            for (int i = 0; i < arrayLength; ++i) {
+                mArray[mThreadNumber][i] = i * i;
+            }
+            for (int i = 0; i < arrayLength; ++i) {
+                for (int j = 0; j < arrayLength; ++j) {
+                    int swap = mArray[mThreadNumber][j];
+                    mArray[mThreadNumber][j] = mArray[mThreadNumber][(j + i) % arrayLength];
+                    mArray[mThreadNumber][(j + i) % arrayLength] = swap;
+                }
+            }
+        }
+    };
+
+    static void doSomeWork(int threadCount) {
+        mArray = new int[threadCount][ARRAY_SIZE];
+        WorkerThread[] threads = new WorkerThread[threadCount];
+        // Create the threads.
+        for (int i = 0; i < threadCount; ++i) {
+            threads[i] = new WorkerThread(i);
+        }
+        // Start the threads.
+        for (int i = 0; i < threadCount; ++i) {
+            threads[i].start();
+        }
+        // Join the threads.
+        for (int i = 0; i < threadCount; ++i) {
+            try {
+                threads[i].join();
+            } catch (Exception ex) {
+            }
+        }
+    }
+
+    // Time limit to run benchmarks in seconds
+    public static final int TIME_LIMIT = 5;
+
+    static void initializeBenchmarks(Activity parent, BenchmarkRunner benchmarks) {
+        benchmarks.addBenchmark("Use 1 thread", () -> {
+            doSomeWork(1);
+        });
+        benchmarks.addBenchmark("Use 2 threads", () -> {
+            doSomeWork(2);
+        });
+        benchmarks.addBenchmark("Use 4 threads", () -> {
+            doSomeWork(4);
+        });
+        benchmarks.addBenchmark("Use 8 threads", () -> {
+            doSomeWork(8);
+        });
+        benchmarks.addBenchmark("Use 16 threads", () -> {
+            doSomeWork(16);
+        });
+    }
+}