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https://issues.apache.org/jira/browse/IGNITE-1346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov closed IGNITE-1346.
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> Implement striped spin busy lock.
> ---------------------------------
>
> Key: IGNITE-1346
> URL: https://issues.apache.org/jira/browse/IGNITE-1346
> Project: Ignite
> Issue Type: Task
> Components: general
> Affects Versions: 1.1.4
> Reporter: Vladimir Ozerov
> Assignee: Vladimir Ozerov
> Fix For: 1.6
>
>
> We have lots of places in code which require "busy" state semantics:
> 1) Multiple readers access some resource concurrently setting "busy" state.
> 2) At some point a single writer comes, prevents all further readers from
> accessing the resource, and blocks until all other previous reades are out.
> Currently we do that using either GridBusyLock or GridSpinBusyLock. The first
> one is based on ReentrantReadWriteLock and the second one is based on
> GridSpinReadWriteLock.
> Both implementation have the same performance characteristics, being limited
> by CPU bus bandwidth when trying to update atomically a shared variable.
> Better approach is to "stripe" the lock across multiple variables this
> minimizing contention between threads. That is, in ideal case each thread
> increments/decrements his own variable without any contention. Writer will
> have to iterate over all these variables and block on each until all readers
> are out.
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