From: Mathieu Baudier <mbaudier@argeo.org>
Date: Sun, 30 Aug 2020 12:24:52 +0000 (+0200)
Subject: Improve UUID benchmarking.
X-Git-Tag: argeo-commons-2.1.89~100
X-Git-Url: https://git.argeo.org/?a=commitdiff_plain;h=b4da7cd1126f691d88edcf959ec8734e35a85017;p=lgpl%2Fargeo-commons.git

Improve UUID benchmarking.
---

diff --git a/org.argeo.util/src/org/argeo/util/UuidUtils.java b/org.argeo.util/src/org/argeo/util/UuidUtils.java
index 54e6b2cb3..788d6b9b8 100644
--- a/org.argeo.util/src/org/argeo/util/UuidUtils.java
+++ b/org.argeo.util/src/org/argeo/util/UuidUtils.java
@@ -240,24 +240,38 @@ public class UuidUtils {
 	public final static void main(String[] args) {
 		UUID uuid;
 
-//		uuid= compactToUuid("996b1f5122de4b2f94e49168d32f22d1");
-//		System.out.println(uuid.toString() + ", isRandom=" + isRandom(uuid));
-
+		uuid= compactToUuid("996b1f5122de4b2f94e49168d32f22d1");
+		System.out.println(uuid.toString() + ", isRandom=" + isRandom(uuid));
+
+		// warm up
+		UUID.randomUUID();
+		timeBasedRandomUUID();
+		timeBasedUUID();
+		UUID.randomUUID();
+		timeBasedRandomUUID();
+		timeBasedUUID();
+		UUID.randomUUID();
+		timeBasedRandomUUID();
+		timeBasedUUID();
+		
 		long begin;
 		long duration;
+		
 		begin = System.nanoTime();
 		uuid = UUID.randomUUID();
 		duration = System.nanoTime() - begin;
 		System.out.println(uuid.toString() + " in " + duration + " ns, isRandom=" + isRandom(uuid));
+		
 		begin = System.nanoTime();
-		uuid = timeBasedRandomUUID();
+		uuid = timeBasedUUID();
 		duration = System.nanoTime() - begin;
 		System.out.println(uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
-//		System.out.println(toBinaryString(uuid, 8, ' '));
-//		System.out.println(toBinaryString(uuid, 16, '\n'));
+		
 		begin = System.nanoTime();
-		uuid = timeBasedUUID();
+		uuid = timeBasedRandomUUID();
 		duration = System.nanoTime() - begin;
 		System.out.println(uuid.toString() + " in " + duration + " ns, isTimeBasedRandom=" + isTimeBasedRandom(uuid));
+//		System.out.println(toBinaryString(uuid, 8, ' '));
+//		System.out.println(toBinaryString(uuid, 16, '\n'));
 	}
 }