Changes between Version 4 and Version 5 of BossaExampleTwo

Timestamp:

Jul 30, 2008, 11:01:19 AM (16 years ago)

Author:

davea

Comment:

--

BossaExampleTwo

@@ -1 @@
-= Example two: replication =
+= Example 2: replication =
 
-This example uses the same type of jobs as the previous example,
+This example uses the same type of jobs as example 1,
 but does replication to increase the accuracy of results.
 Every job is sent to at least two different volunteers.
-A job is considered finished if either
 
- * Two volunteers reported "no ellipse found";
- * Two volunteers found ellipses, and their centers are within 20 pixels;
+We'll use the following job distribution policy:
+ * Initially all jobs have the default priority (1)
+ * When we send the first instance of a job we set its priority to 2, so that we'll get another instance soon.
+ * When a 2nd or subsequent instance is issued we set the priority to 0.
+ * When an instance times out, or finished but without consensus, we set the priority to 2.
 
-If ten instances have been performed and neither condition holds,
-the job is marked as "inconclusive" and no further instances are issued.
+We'll use the following replication policy:
+ * A job is considered finished if either
+  * Two volunteers reported "no ellipse found";
+  * Two volunteers found ellipses, and their centers are within 20 pixels;
+ * If ten instances have been performed and neither condition holds, the job is marked as "inconclusive" and no further instances are issued.
 
-The following 
 When the first instance of a job is issued, its priority is left at 1;
 this allows another instance to be issued immediately.
-
 {{{
 function job_issued($job, $inst, $user) {
@@ -25 +28 @@
 }}}
 
+
 When an instance is finished,
-we check whether
+we check whether there are now two consistent responses.
+If so we mark the job as DONE.
+If there are 10 finished instances, we mark it as INCONCLUSIVE.
+Otherwise we set its priority to 2, so that we'll get another instance.
 {{{
 function job_finished($job, $inst) {