New Chronicle-Map

src/test/java/net/openhft/chronicle/map/PageLatencyMain.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2014 Higher Frequency Trading http://www.higherfrequencytrading.com
+ *
+ * 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 net.openhft.chronicle.map;
+
+/**
+ * Created by peter on 28/02/14.
+ */
+public class PageLatencyMain {
+    public static final int PAGES = Integer.getInteger("pages", 1024 * 1024);
+    public static final int PAGES_SIZE = 512; // longs
+    public static volatile long b;
+
+    public static void main(String... ignored) {
+        long[] bytes = new long[PAGES * PAGES_SIZE];
+        long maxTime = 0;
+        for (int j = 0; j < 10; j++) {
+            for (int i = 0; i < PAGES; i++) {
+                long start0 = System.nanoTime();
+                b = bytes[i * PAGES_SIZE];
+                if (b != 0) throw new AssertionError();
+                long time = System.nanoTime() - start0;
+                if (time > maxTime) maxTime = time;
+                if (time > 1e5)
+                    System.out.println("Page access time was " + time / 100000 / 10.0 + " ms");
+            }
+        }
+        System.out.println("Longest page access time was " + maxTime / 10000 / 100.0 + " ms");
+    }
+}