Changeset 32632 for trunk/Ohana/src/opihi/pcontrol/CheckIdleHost.c

Timestamp:

Nov 8, 2011, 2:54:20 PM (15 years ago)

Author:

eugene

Message:

add nice ability to pantasks/pcontrol/pclient; add ports to pantasks_server; minor updates to dvo skycoverage, etc

File:

• trunk/Ohana/src/opihi/pcontrol/CheckIdleHost.c (modified) (1 diff)

trunk/Ohana/src/opihi/pcontrol/CheckIdleHost.c

@@ -5 +5 @@
 // a (temporary?) work-around for the problem that the remote pclient job tends to grow
 // too large over time.
+
+/****
+     
+     queueing strategy:
+
+     We have a problem when the queue contains many jobs of different processing times.  If we
+     start with an equal number of jobs in two classes, fast and slow, eventually, we will end
+     up with all hosts running the slow jobs and the fast jobs completely blocked.  If J1 takes
+     T1 and J2 takes T2, and jobs have equal probability to land in a slot... ??
+
+     It seems like we should boost the probability of the fast jobs over the slow jobs (of
+     course, the end result of that will be all fast jobs draining and the slow jobs hanging
+     around).  
+
+     There is also a problem related to LAP, in that chip stage has a huge number of tasks in
+     the queue (effectively infinite).  Make the probability of the job being selected
+     proportional to something.  In any case, we need a user-controllable way to change the
+     probability of selection
+
+     As things are implemented below, the selection order depends on the queue order.  The
+     easiest way to modify the probabilities is to re-sort based on something.
+
+ ****/
 
 static float MAX_WANTHOST_WAIT = 10.0;