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/*
* 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.
*/
package com.android.startop.test;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Trace;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.TextView;
import java.util.Arrays;
class Benchmark {
public static final int NUM_ITERATIONS = 1000;
public Benchmark(ViewGroup parent, CharSequence name, Runnable thunk) {
Context context = parent.getContext();
Button button = new Button(context);
TextView mean = new TextView(context);
TextView stdev = new TextView(context);
button.setText(name);
mean.setText("");
stdev.setText("");
button.setOnClickListener((_button) -> {
mean.setText("Running...");
stdev.setText("");
new AsyncTask() {
double resultMean = 0;
double resultStdev = 0;
@Override
protected Object doInBackground(Object... _args) {
long[] results = new long[NUM_ITERATIONS];
// Run benchmark
for (int i = 0; i < results.length; i++) {
results[i] = -System.nanoTime();
thunk.run();
results[i] += System.nanoTime();
}
// Compute mean
long sum = Arrays.stream(results).sum();
resultMean = (double) sum / results.length;
// Compute standard deviation
double variance = 0;
for (long i : results) {
double t = (double) i - resultMean;
variance += t * t;
}
variance /= results.length - 1;
resultStdev = Math.sqrt(variance);
return null;
}
@Override
protected void onPostExecute(Object _result) {
mean.setText(String.format("%.3f", resultMean / 1e6));
stdev.setText(String.format("%.3f", resultStdev / 1e6));
}
}.execute(new Object());
});
parent.addView(button);
parent.addView(mean);
parent.addView(stdev);
}
}
public class SystemServerBenchmarkActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.system_server_benchmark_page);
GridLayout benchmarkList = findViewById(R.id.benchmark_list);
new Benchmark(benchmarkList, "Empty", () -> {
});
PackageManager pm = getPackageManager();
new Benchmark(benchmarkList, "getInstalledApplications", () -> {
pm.getInstalledApplications(PackageManager.MATCH_SYSTEM_ONLY);
});
}
}
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