Java 8 in a JEE Environment (original) (raw)

Aleksey Shipilev aleksey.shipilev at oracle.com
Mon Apr 15 01:11:09 PDT 2013

On 04/15/2013 11:46 AM, Ian Clough wrote:

I am wondering how the parallel mode operations will play in a JEE environment where the container is largely responsible for the threading behaviour of the application. Suppose we have a statistics package which uses parallel operations, we would want this to operate in parallel mode for a single user and possible in lightly loaded JEE server environments but would want sequential mode in heavily loaded JEE environment. I am assuming, possibly wrongly, that parallel mode is significantly less efficient than sequential.

IIRC, the Java EE concurrency folks had been already talked through this, and the current outcome is that FJP will gracefully degrade to single-threaded (even caller-context) execution when running from within the EE container. That will automatically mean the parallel stream operations are effectively sequential.

And no, the overhead of doing parallel decomposition right should not be drastically slower than doing the same thing sequentially; this is due pending research.

-Aleksey.

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