fix errors and start on a performance test

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/src/datastructures/PerformanceTest.java b/src/datastructures/PerformanceTest.java
new file mode 100644
index 0000000..b771aad
--- /dev/null
+++ b/src/datastructures/PerformanceTest.java
@@ -0,0 +1,95 @@
+/**
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package datastructures;
+import datastructures.linkedlists.*;
+
+import java.util.Random;
+
+
+/**
+ * This program be used to test the performance of
+ * some datastructures
+ */
+public class PerformanceTest
+{
+    /**
+     * This is the main entry point of the test
+     * 
+     * @param  args  Command line arguments
+     */
+    public static void main(final String... args)
+    {
+	int numElements, maxElements = 1 << 23;
+	Random rng = new Random();
+	
+	for (numElements = 1; numElements <= maxElements; numElements <<= 1)
+	{
+	    long time, subtime;
+	    Integer[] elements = new Integer[numElements];
+	    System.out.println("Using " + numElements + " random elements.");
+	    for (int i = 0; i < numElements; i++)
+		elements[i] = Integer.valueOf(rng.nextInt());
+	    
+	    ArrayDoublyLinkedList<Integer> arrayDoublyLinkedList =
+		new ArrayDoublyLinkedList<Integer>(Integer.class);
+	    DoublyLinkedList<Integer> doublyLinkedList =
+		new DoublyLinkedList<Integer>(Integer.class);
+	    ArraySinglyLinkedList<Integer> arraySinglyLinkedList =
+		new ArraySinglyLinkedList<Integer>(Integer.class);
+	    SinglyLinkedList<Integer> singlyLinkedList =
+		new SinglyLinkedList<Integer>(Integer.class);
+	    ArraySentinelDoublyLinkedList<Integer> arraySentinelDoublyLinkedList =
+		new ArraySentinelDoublyLinkedList<Integer>(Integer.class);
+	    SentinelDoublyLinkedList<Integer> sentinelDoublyLinkedList =
+		new SentinelDoublyLinkedList<Integer>(Integer.class);
+	    ArraySentinelSinglyLinkedList<Integer> arraySentinelSinglyLinkedList =
+		new ArraySentinelSinglyLinkedList<Integer>(Integer.class);
+	    SentinelSinglyLinkedList<Integer> sentinelSinglyLinkedList =
+		new SentinelSinglyLinkedList<Integer>(Integer.class);
+	    
+	    System.out.println();
+	    System.out.println("Insert at beginning:");
+	    
+£<for class in {Array,}{Sentinel,}{Doubly,Singly}LinkedList; do
+  list_a=${class::1}
+  list_b=${class:1}
+£>list=${list_a,,}${list_b}
+	    System.gc();
+	    try
+	    {
+		Thread.sleep(100);
+	    } catch(InterruptedException e) {}
+	    time = 0;
+	    for (int i = 0; i < numElements; i++)
+	    {
+		subtime = System.nanoTime();
+		£{list}.insertBeginning(elements[i]);
+		time += System.nanoTime() - subtime;
+	    }
+	    time /= numElements;
+	    System.out.printf("%30s: %7d.%03d µs/element\n", "£{class}",
+			      time / 1000, time % 1000);
+	    £{list} = null;
+£>done
+	    
+	    System.out.println();
+	    System.out.println();
+	}
+    }
+    
+}
+