Alan.Bateman at Sun.COM
Thu Dec 31 08:40:56 PST 2009
John Davis wrote:
> Any plans to add the new 2008 Server API's to nio?
Maybe, but it depends on the configuration. With a fixed thread pool
then each thread retrieves a completion result and dispatches directly
to the completion handler. For that case it would be inconvenient to
retrieve completion results in batch. However for a cached or other
thread pool then there are 1+ internal threads where each thread
retrieves a completion result and submits a task to the thread pool to
invoke the completion handler. For that configuration then it may be
beneficial (esp. when there is a single internal thread retrieving
events) but we would need to measure it before changing the code. Have
you done any tests or do you have performance results that you could
share on this one?
No specific plans at this point because it requires special privileges
to lock pages into memory. However if there was some measurable
improvement for privileged users then it wouldn't be too difficult to
make of use of this as there is already a cache of OVERLAPPED structures
per channel (or handle).
This one is new (to me anyway). In the implementation we don't use a
completion events. If Windows is still setting some internal event and
this can be skipped then it could be beneficial. We require a completion
result per successful I/O operation so we couldn't use that mode.
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