diff --git a/multiThreadedFileIO/DataCreator.java b/multiThreadedFileIO/DataCreator.java new file mode 100644 index 0000000..e551be1 --- /dev/null +++ b/multiThreadedFileIO/DataCreator.java @@ -0,0 +1,71 @@ +import java.io.BufferedWriter; +import java.io.File; +import java.io.FileWriter; +import java.math.*; + +/** + * Simple class to generate random data for + * file IO tests. + * + * @author Jeffery Russell 1-31-19 + */ +public class DataCreator +{ + /** + * Generates an obscure random character + * @return + */ + private static char rndChar() + { + // or use Random or whatever + int rnd = (int) (Math.random() * 52); + char base = (rnd < 26) ? 'A' : 'a'; + return (char) (base + rnd % 26); + } + + + /** + * Simple function to save contents to the disk + * + * @param s + * @param fileName + */ + private static void saveToDisk(String s, String fileName) + { + BufferedWriter writer; + try + { + File file = new File(fileName); + file.createNewFile(); + writer = new BufferedWriter(new FileWriter(file)); + writer.write(s); + writer.flush(); + writer.close(); + } + catch (Exception e) + { + e.printStackTrace(); + } + } + + + /** + * Creates 5MB of random test data to use + */ + public static void main(String[] arguments) + { + System.out.println("Creating Test Files"); + for(int i = 0; i < 100; i++) + { + //10k random characters for each file + //each file is 10kb * 500 files, total size of 5MB + String s = ""; + for(int j = 0; j < 1000000; j++) + { + s = s + rndChar(); + } + saveToDisk(s, "./testData/" + i + ".txt"); + System.out.println(s); + } + } +} \ No newline at end of file diff --git a/multiThreadedFileIO/MultiThreadedFileReadTest.java b/multiThreadedFileIO/MultiThreadedFileReadTest.java new file mode 100644 index 0000000..32c63df --- /dev/null +++ b/multiThreadedFileIO/MultiThreadedFileReadTest.java @@ -0,0 +1,40 @@ +import java.util.*; + +/** + * File to test the performance of multi threaded file + * io by reading a large quantity of files in parallel + * using a different amount of threads. + * + * @author Jeffery Russell 1-31-19 + */ +public class MultiThreadedFileReadTest +{ + public static void main(String[] args) + { + List x = new ArrayList<>(); + List y = new ArrayList<>(); + for(int i = 1; i <= 64; i++) + { + long threadTotal = 0; + for(int w = 0; w < 20; w++) + { + TaskManager boss = new TaskManager(i); + + for(int j = 0; j < 500; j++) + { + boss.addTask(new ReadTask("./testData/" + i + ".txt")); + } + long startTime = System.nanoTime(); + boss.runTasks(); + long endTime = System.nanoTime(); + long durationMS = (endTime - startTime)/1000000; + threadTotal+= durationMS; + } + + x.add(i); + y.add(threadTotal/20.0); //finds average + } + System.out.println(x); + System.out.println(y); + } +} \ No newline at end of file diff --git a/multiThreadedFileIO/TaskManager.java b/multiThreadedFileIO/TaskManager.java index 63b5ce1..2929b31 100644 --- a/multiThreadedFileIO/TaskManager.java +++ b/multiThreadedFileIO/TaskManager.java @@ -44,18 +44,29 @@ public class TaskManager Thread[] runners = new Thread[desiredThreads]; - System.out.println("Total Tasks: " + tasks.size()); - System.out.println("Threads Used:" + desiredThreads); - - for(int i = 0; i < desiredThreads; i++) { runners[i] = new Thread(()-> { - while(!tasks.isEmpty()) + ReadTask t = null; + while(true) { - ReadTask t = tasks.remove(0); - t.runTask(); + //need synchronized block to prevent + //race condition + synchronized (tasks) + { + if(!tasks.isEmpty()) + t = tasks.remove(0); + } + if(t == null) + { + break; + } + else + { + t.runTask(); + t = null; + } } }); runners[i].start(); diff --git a/multiThreadedFileIO/graph.py b/multiThreadedFileIO/graph.py new file mode 100644 index 0000000..469f90b --- /dev/null +++ b/multiThreadedFileIO/graph.py @@ -0,0 +1,13 @@ +import matplotlib.pyplot as plt + + +xList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64] +yList = [230.5, 124.0, 84.65, 63.9, 51.6, 44.2, 39.15, 34.9, 31.9, 28.7, 27.2, 25.05, 24.25, 22.8, 21.25, 20.45, 19.8, 19.4, 18.6, 17.45, 17.0, 16.95, 16.4, 24.15, 15.2, 15.2, 15.0, 14.3, 14.7, 14.65, 14.65, 14.75, 13.85, 15.1, 14.35, 35.75, 15.3, 14.45, 14.25, 13.65, 14.45, 14.6, 13.95, 14.65, 14.5, 14.3, 14.85, 14.15, 15.0, 16.25, 14.25, 14.4, 14.15, 14.45, 14.25, 14.85, 14.3, 14.35, 15.35, 13.6, 14.3, 14.2, 14.3, 13.95] + + + +plt.plot(xList, yList) +plt.xlabel('Number of Threads') +plt.ylabel('Execution Time (MS)') + +plt.show() \ No newline at end of file