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Task #300 (new)

Opened 18 years ago

Last modified 17 years ago

Linear performance degradation with increasing number of groupexperimentermaps

Reported by: jamoore Owned by: jamoore
Priority: critical Milestone: Unscheduled
Component: Performance Version: 3.0-M3
Keywords: detached, clientsession, cleanup Cc:
Resources: n.a. Referenced By: n.a.
References: n.a. Remaining Time: n.a.
Sprint: n.a.


Somewhere in the security system the n+1 select problem is occurring with GroupExperimenterMaps. This wouldn't normally never be seen because of the small group of group/user interconnects, but it's getting nasty during security testing.

Change History (4)

comment:1 Changed 18 years ago by jmoore

  • Component changed from Security to Performance
  • Keywords detached clientsession added; performance queries removed

Looks like this is coming from the fact that I'm passing back in detached groups/owners. The calls on IAdmin.lookup{Experimenter|Group} return a lot of owners and groups. Passing these detached instances back into the server is guaranteed to re-load them all n+1 select style. In general, a mechansim to filter out the unchanged objects (passing unloaded proxies) would be a big performance boost. This could be combined with the client session.

comment:2 Changed 17 years ago by jmoore

  • Milestone changed from 3.0-M3 to 3.0-RC1

Around 1500 users and 500 groups, I also started to see OOM exceptions (Not proved to be related) We'll need to look into this before release. Rescheduling.

comment:3 Changed 17 years ago by jmoore

r933 added some methods to LocalAdmin to cut down on some of the groups and group/user maps which get loaded. This needs to be tested with a profiler.

comment:4 Changed 17 years ago by jmoore

  • Keywords cleanup added
  • Milestone changed from 3.0-Beta2 to 3.0-RC1
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