自己维护notEmptyWaitThreadCount计数

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@713 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/test/java/com/alibaba/druid/benckmark/TestAtomicPerformance.java

@@ -0,0 +1,45 @@
+package com.alibaba.druid.benckmark;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import junit.framework.TestCase;
+
+public class TestAtomicPerformance extends TestCase {
+
+    public void test_0() throws Exception {
+        AtomicInteger count = new AtomicInteger();
+        for (int i = 0; i < 5; ++i) {
+            perf(count);
+        }
+        System.out.println();
+        for (int i = 0; i < 5; ++i) {
+            perf2(count);
+        }
+    }
+
+    private void perf(AtomicInteger count) {
+        long startMillis = System.currentTimeMillis();
+
+        count.set(0);
+        for (int i = 0; i < 1000 * 1000 * 100; ++i) {
+            int value = count.get();
+            count.compareAndSet(value, value + 1);
+        }
+
+        long millis = System.currentTimeMillis() - startMillis;
+        System.out.println("millis " + millis);
+    }
+    
+    private void perf2(AtomicInteger count) {
+        long startMillis = System.currentTimeMillis();
+
+        count.set(0);
+        for (int i = 0; i < 1000 * 1000 * 100; ++i) {
+            int value = count.get();
+            count.weakCompareAndSet(value, value + 1);
+        }
+
+        long millis = System.currentTimeMillis() - startMillis;
+        System.out.println("weak millis " + millis);
+    }
+}

src/test/java/com/alibaba/druid/bvt/pool/TestIdle3_Concurrent_Starvation.java

@@ -62,7 +62,7 @@ public class TestIdle3_Concurrent_Starvation extends TestCase {
         }
 
         for (int i = 0; i < 1; ++i) {
-            final int threadCount = 5;
+            final int threadCount = 10;
             concurrent(threadCount);
         }