Automatic sources dropoff on 2020-06-10 18:32:38.095721
The change is generated with prebuilt drop tool.
Change-Id: I24cbf6ba6db262a1ae1445db1427a08fee35b3b4
diff --git a/android/multiuser/BenchmarkResults.java b/android/multiuser/BenchmarkResults.java
new file mode 100644
index 0000000..c1362dc
--- /dev/null
+++ b/android/multiuser/BenchmarkResults.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2017 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.multiuser;
+
+import android.os.Bundle;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.concurrent.TimeUnit;
+
+public class BenchmarkResults {
+ private final ArrayList<Long> mResults = new ArrayList<>();
+
+ public void addDuration(long duration) {
+ mResults.add(TimeUnit.NANOSECONDS.toMillis(duration));
+ }
+
+ public Bundle getStatsToReport() {
+ final Bundle stats = new Bundle();
+ stats.putDouble("Mean (ms)", mean());
+ return stats;
+ }
+
+ public Bundle getStatsToLog() {
+ final Bundle stats = new Bundle();
+ stats.putDouble("Mean (ms)", mean());
+ stats.putDouble("Median (ms)", median());
+ stats.putDouble("Sigma (ms)", standardDeviation());
+ return stats;
+ }
+
+ public ArrayList<Long> getAllDurations() {
+ return mResults;
+ }
+
+ private double mean() {
+ final int size = mResults.size();
+ long sum = 0;
+ for (int i = 0; i < size; ++i) {
+ sum += mResults.get(i);
+ }
+ return (double) sum / size;
+ }
+
+ private double median() {
+ final int size = mResults.size();
+ if (size == 0) {
+ return 0f;
+ }
+
+ final ArrayList<Long> resultsCopy = new ArrayList<>(mResults);
+ Collections.sort(resultsCopy);
+ final int idx = size / 2;
+ return size % 2 == 0
+ ? (double) (resultsCopy.get(idx) + resultsCopy.get(idx - 1)) / 2
+ : resultsCopy.get(idx);
+ }
+
+ private double standardDeviation() {
+ final int size = mResults.size();
+ if (size == 0) {
+ return 0f;
+ }
+ final double mean = mean();
+ double sd = 0;
+ for (int i = 0; i < size; ++i) {
+ double diff = mResults.get(i) - mean;
+ sd += diff * diff;
+ }
+ return Math.sqrt(sd / size);
+ }
+}
