> From: Ohad Shacham <
ohad.shacham@...>
> To:
dev@...
> Sent: 08/11/09, 14:47:25
> Subject: ConcurrentHashMap
>
> Hi,
>
>
>
> I noticed that in version 6.0.20 several Hashtables and HashMaps were
> replaced by ConcurrentHashMaps. I have noticed that many Hashtables were not
> replaced; therefore, I assume that a contention detection tool was used to
> identify the contended Hashtables.
Not to my knowledge.
> I would be happy to know if this is the
> case and also whether a scalability and/or performance improvement was
> achieved by switching these collections with concurrent ones.
Based on general experience I'd say yes, mainly for multi-core machines. In specific cases I don't recall any measurements or results.
The corresponding comit messages should be the best source of information for individual changes.
Mark
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