[infinispan-issues] [JBoss JIRA] (ISPN-2414) Optimise memory hotspots for local caches

[Galder Zamarreño (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-2414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Galder Zamarreño updated ISPN-2414:
-----------------------------------

    Fix Version/s: 5.1.9.Final

    
> Optimise memory hotspots for local caches
> -----------------------------------------
>
>                 Key: ISPN-2414
>                 URL: https://issues.jboss.org/browse/ISPN-2414
>             Project: Infinispan
>          Issue Type: Enhancement
>            Reporter: Galder Zamarreño
>            Assignee: Galder Zamarreño
>             Fix For: 5.2.0.CR1, 5.2.0.Final, 5.1.9.Final
>
>         Attachments: Screen Shot 2012-10-17 at 1.21.48 PM.png, Screen Shot 2012-10-17 at 1.25.45 PM.png, Screen Shot 2012-10-17 at 1.30.09 PM.png, Screen Shot 2012-10-17 at 1.33.46 PM.png
>
>
> Several small memory hotspots have been discovered during some performance testing of local caches. Optimise them.
> 1. Collections.EmptySet.Iterator: Screen%20Shot%202012-10-17%20at%201.21.48%20PM.png
> - First of all, iterating over an empty set returns a brand new iterator instance all the time. WTF?
> - Second, why does get() have to call unlockAll()? We do not acquire locks on get (unless it has a FORCE_WRITE_LOCK flag on it), right?
> 2. ThreadLocal.set:  Screen%20Shot%202012-10-17%20at%201.25.45%20PM.png
> - Is this neeeded at all?
> - If it's needed for any use case, can it be optimised away to avoid using it for a local cache where no marshaller is used, and where no cluster cache loader is used?
> 3. AbstractInvocationContext instances: Screen%20Shot%202012-10-17%20at%201.30.09%20PM.png
> - Why is this expensive? Is it cos the reference to the ClassLoader?
> - If it's the ClassLoader ref, can we move this away for local caches?
> 4. AbstractFlagAffectedCommand instances: Screen%20Shot%202012-10-17%20at%201.33.46%20PM.png
> - Might be worth thinking how can we shrink these commands for local, unflagged, operations, such as get?

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