[rules-users] help with diagnosing CEP performance issue

[Wolfgang Laun]

(OT: your nick "me" is confusing other gmail users. I see your mail as if I
had sent it to myself. I was almost binning it.)

The delay you see may depend on the way you run the test with 40K events.
Please describe the sequence of insertions and calls to fire...(), the
session setup (pseudo-clock, etc.)

-W


2010/12/23 me <radai.rosenblatt at gmail.com>

> Hi.
>
> im trying to demo drools-fusion for a system that processes backup events.
> i have the following 2 CEP rules:
>
> rule "Backup Not Succeeded For At Least 3 Days"
> @ruleId(1)
> when
>     Node($id : id)
>     not ( Backup(clientId == $id, $state: state ==
> BackupStateEnum.FINISHED) over window:time( 3d ) from entry-point "Backup
> Stream" )
> then
>     //nothing for now
> end
>
> rule "Prune Previous Successful Backups"
> @ruleId(2)
> when
>     $prevBackup  : Backup($id : clientId,  state ==
> BackupStateEnum.FINISHED) from entry-point "Backup Stream"
>     $newerBackup : Backup(clientId == $id, state ==
> BackupStateEnum.FINISHED, this after $prevBackup) from entry-point "Backup
> Stream"
> then
>     drools.retract($prevBackup);
> end
>
> rule #2 is my attempt to cut down on memory usage. the problem is that rule
> #2 slows down the processing very very considerably (2 orders of magnitude
> slower when simulating batches of 40K events/day).
>
> what would be my next step in trying to find the reason for it? my
> intuition tells me that with 2 events in the system at any given time
> instead of 120K (single node, 40K events/day 3 day window) i should have
> seen either a speedup or reduced memory consumption (if not both) and yet
> the results im seeing are the exact opposite.
> is there anything im missing ? i could try adding some sort of
> LastSuccessfulBackup "marker" object into main memory and updating it using
> events from the backup stream, but then how would i express rule #1 ?
>
> any help/clues/suggestions would be greatly appreciated,
>
>    radai.
>
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