Benchmark for reading and parsing 10000000 integers

BufferedScannerPerfTest.java

package org.coursera.algs4partII002.perf;

import org.junit.Test;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.StringTokenizer;

public class BufferedScannerPerfTest {

    @Test
    public void testScanner() {
        Scanner scanner = new Scanner(new BufferedInputStream(getClass().getResourceAsStream("/integers.dat")));
        for (int i = 0; i < 10000000; i++) {
            if (scanner.hasNext()) {
                scanner.nextInt();
            }
        }
    }

    @Test
    public void testBufferedReader() throws IOException {
        StringTokenizer stringTokenizer = new StringTokenizer("", "\n");
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("/integers.dat")));
        for (int i = 0; i < 10000000; i++) {
            if (stringTokenizer.hasMoreTokens() != true) {
                stringTokenizer = new StringTokenizer(bufferedReader.readLine());
            }
            Integer.parseInt(stringTokenizer.nextToken());
        }

    }

}

// +------------------+--------------+-------------+--------------+-------------+--------+
// | Test             | Time Elapsed | Usage Delta | Usage Before | Usage After | Result |
// +------------------+--------------+-------------+--------------+-------------+--------+
// |testBufferedReader|            2s|   491,542 Kb|      4,377 Kb|   495,920 Kb|  Passed|
// +------------------+--------------+-------------+--------------+-------------+--------+
// |       testScanner|           12s|   232,761 Kb|    495,920 Kb|   728,682 Kb|  Passed|
// +------------------+--------------+-------------+--------------+-------------+--------+

GenIntegers.java

package org.coursera.algs4partII002.perf;

import org.junit.Test;

import java.io.*;
import java.util.Random;
import java.util.logging.Logger;

public class GenIntegers {
    @Test
    public void genIntegers() throws ClassNotFoundException, IOException {
        Random random = new Random(System.currentTimeMillis());
        File integers = new File(Class.forName("org.coursera.algs4partII002.perf.BufferedScannerPerfTest").getResource("/").getPath() + "../../src/main/resources/integers.dat");
        Logger.getAnonymousLogger().info(integers.getAbsolutePath());
        if (integers.exists() == false)
            integers.createNewFile();
        BufferedWriter outputStream = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(integers)));
        for (int i = 0; i < 10000000; i++) {
            int v = random.nextInt();
            if (v < 0)
                v = -v;
            outputStream.append(String.valueOf(v));
            outputStream.append("\n");
        }
        outputStream.close();
    }
}

ReaderPerfTest.cc

#include <cstdio>

int main(void) {
  FILE *f = fopen("../../../target/classes/integers.dat", "r");
  int N = 10000000;
  int n = 0;
  for(int i = 0; i < N; i++) {
    fscanf(f, "%d", &n);
  }

  return 0;
}

// $ gcc -o ReaderPerfTest -Wall -O3 ReaderPerfTest.cc
// $ time `./ReaderPerfTest.exe`
// 
// real    0m4.873s
// user    0m4.664s
// sys     0m0.155s
//