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https://issues.apache.org/jira/browse/GEODE-212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anthony Baker updated GEODE-212:
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Fix Version/s: 1.0.0-alpha1
> ResourceManager implementation impacts off-heap performance
> -----------------------------------------------------------
>
> Key: GEODE-212
> URL: https://issues.apache.org/jira/browse/GEODE-212
> Project: Geode
> Issue Type: Bug
> Components: offheap
> Reporter: Darrel Schneider
> Assignee: Darrel Schneider
> Fix For: 1.0.0-alpha1
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> When the resource manager is configured with either a eviction or critical
> threshold then it registers a listener with the off-heap
> SimpleMemoryAllocator that causes every off-heap allocate and free to call
> this listener.
> The current listener does a synchronize on a singleton and notifies it. This
> will impact the rate at which multiple threads can allocate and free off-heap
> objects.
> I simple test using 8 threads showed that without the resource manager they
> could do 16 million allocate/frees in 3 seconds. With the resource manager it
> took 12 seconds.
> The notify is done to a singleton thread that simple checks to see if the new
> off-heap memory size would result in a change to the resource manager state.
> This can be done without synchronizing. Only if a change is possible do we
> need to do the sync and notify.
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