[wildfly-dev] Pooling EJB Session Beans per default

[Bill Burke]

On 8/4/2014 8:44 PM, James Livingston wrote:
> On Mon, 2014-08-04 at 20:22 -0400, Bill Burke wrote:
>> I always liked the ThreadLocal pool.   No synchronization, little to no
>> allocations.
>
> It also can cause massive memory leaks if invoked from threads which
> aren't re-used, like timer threads, and precautions aren't taken. AS/EAP
> 5 suffered from that problem with the default ThreadLocalPool.
>

Which is also something that could be mitigated by a common thread 
facility.  Something AS/EAP 5 didn't have.

Honestly though, I think this talk of EJB pooling is ridiculous. 
Component layers like CDI and JAX-RS don't have pooled architectures for 
their per-request objects.  Also, in an average application, there are 
multiple orders of magnitude more non component classes that are being 
instantiated per request.  Just think of all the Strings created by a 
simple HTTP request.

You want a better focus?  How about JSON/XML marshalling?  Which could 
make things much easier to maintain then the hand-coded parsers that 
Wildfly uses to parse config.  And much faster and less memory at 
runtime for SOAP and JAX-RS request that currently rely on java reflection.

You could go research perfect hashing algorithms for URL matching with 
servlets and JAX-RS.

You could go do some perf analysis of all of our frameworks to make 
memory reduction and speed recommendations or even Pull Requests.

You could visit each major project and make sure our automated builds 
have and can run automated stress tests and are measured against 
previous versions.

Or you could just focus on these silly benchmarks that test no-op HTTP 
and EJB requests.


-- 
Bill Burke
JBoss, a division of Red Hat
http://bill.burkecentral.com