Changes between Version 54 and Version 55 of Check

Timestamp:

Oct 29, 2010, 1:10:44 PM (14 years ago)

Author:

alexandru.olteanu

Comment:

--

Check

@@ -413 +413 @@
 === Performance ===
 
-The lag between the detection of a node failing and restoring the service, by turning it on for another node, is usually around a few miliseconds. We have tried a few measurements, for both local islands and remote islands. In these examples, the Self-healing service is running in the same network as the Bucharest island and we introduce node failures in both islands.
+The lag between the detection of a node failing and restoring the service, by turning it on for another node, is usually around 30-40 miliseconds. We have tried a few measurements, for both local islands and remote islands. In these examples, the Self-healing service is running in the same network as the Bucharest island and we introduce node failures in both islands.
 
 [[Image(sh-performance.png, center, 600px)]]
@@ -419 +419 @@
 The data from the above screenshot is better shown in this table:
 
-||= Test no. =||= Node failure =||= Detection time =||= Service restored time =||= Lag =||
-|| 1 || remote || || ||
-|| 2 || remote || || ||
-|| 3 || remote || || ||
-|| 4 || remote || || ||
-
-You may notice that the mean restore time for local failures is ~ and the mean restore time for remote failures is ~. 
+||= Test no. =||= Node failure =||= Detection time [s] =||= Service restored time [s] =||= Lag [ms] =||
+|| 1 || remote || 24.182 || 24.297 || 115 ||
+|| 2 || local || 30.741 || 30.775 || 34 ||
+|| 3 || remote || 04.876 || 05.016 || 140 ||
+|| 4 || local || 37.247 || 37.279 || 32 ||
+
+You may notice that the mean restore time for local failures is ~30-40 ms and the mean restore time for remote failures is ~100-150 ms. The difference between remote and local times is most probably caused by network lag times and remote times can vary even more depending on the connection between the computer running the Self-healing service and the network island.
 
 = Proposed Check Demonstration Sketch =