On 11/4/10 3:18 PM, Steve wrote:
Not Paul, Phil. My bad!
Hey, NP. I have a brother named Paul and he is way smarter than me :)
S
On Nov 4, 2010, at 2:34 PM, Steven Siebert <[email protected]> wrote:
First, Paul, nice presentation at ApacheCon =)
I came up after the discussion to mention a feature I added to my
pool implementation, wanted to record this here and get community
thoughts.
What I have done for a customer (non-releasable, but I can
re-implement much cleaner) was essentially enable the pool to
"track" its maintenance operations over a 24-hour period (starting
at 0000) to better "predict" configuration changes that needed to
take place. This was helpful in our dev-to-production deployments
for configuration "burn-in"...we could have guessed what the
config for the pool should be...but this helped get it right
quickly. We kept it running (intentionally) and detected trends
over the first week. We then turned this feature off (via JMX) and
pool could then adjust itself based on it's learned data.
Admittedly, this was a "crude" implementation that was used to
improve performance due to our predictable spikes....there is a
lot more that could be done.
First question: is this coming the community would like?
Second: If it is desired, I implemented this by re-implementing
the evictor...Paul suggested this might also be a good fit for an
"outside" implementation (I can see this, as well)
We have talked a little over the years about making the pool smarter
or in some sense "adaptive." The crude capabilities available now
via the maintenance thread (aka "Evictor") and idle instance
settings could certainly be improved. Have a look at the
ErodingObjectPool and others in PoolUtils for other ideas in this
direction.
The challenge with making a smart pool implementation is that it is
hard to define an algorithm that "does no harm" (i.e. always
actually improves performance) can be fully documented and is at
least tractable to document, maintain and support. That does not
mean it is impossible and I am interested in having a look at your
ideas.
So we have something concrete to look at, why don't you create a
patch with the new pool extending GOP if that is convenient?
Thanks!
Phil
Finally: What features would you like to see?
Thoughts?
Steve
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
