Hi Shally,

> So, would like to understand it bit more on how flag would help app to tune 
> itself as per current given
> description?
> For example, if PMD says, It does actual processing in dequeue, then how it 
> will impact app design for
> better performance?
[Fiona] One example: It could enqueue a large burst, say 32 ops. Then if it 
tried to dequeue 32 ops that
could be a very long blocking call. So instead it could choose to dequeue 8 at 
a time.
Vice versa if work done in enqueue.

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