Re: Speed issues?

["David Morris" <David.Morris@xxxxxxxxxxxxx>]

Robert,

I have used the Commons pool, Commons DBCP, and Tyrex Pooling on the
iSeries. These all work fine. Be careful with the Commons code because

there is very little documentation and it is easy to code a wait on
pool
resources that will never exist. I could give you some examples if it
would help along with a home grown cache I wrote. You might also
check out the Avalon project for caching code that is part of
Excalibur. I
looked into their implementation and it was based on a LRU algorithm
that
did not work well for my needs so I ended up creating my own
implementation
and posting a description of that algorithm to the Avalon developer's
list.

David Morris

>>> rupshall@psasoft.com 07/16/02 01:21PM >>>
I think even though you caught the end, you hit the nail on the head.
I had
an idea that implementing a thin client with a server on the backend
would
help things but it is out of my league to try and write a true
client/server
implementation.  If they are Open Source solutions that may help me
then I
have something else to research.

I have a few things to try now and I don't know what method will work
best,
I'll probably need to implement a mixture of all.

Also, do all the below mentioned pooling tools work on an AS400
environment?

Robert



----- Original Message -----
From: "David Morris" <David.Morris@plumcreek.com>
To: <java400-l@midrange.com>
Sent: Tuesday, July 16, 2002 1:14 PM
Subject: Re: Speed issues?


> Robert,
>
> For some reason I only caught the tail end of this so I may not
> understand the
> speed issue, but it sounds like you have a GUI (swing?) thick client
> that is not
> performing well. One thing that can help performance is pooling of
> objects and
> connections. If you don't have a server component, it is going to be
> difficult
> to efficiently pool resources and scalability will likely be an
issue.
>
> There are all kinds of schemes and tools you can use to pool or
cache
> resources
> but they work best when you have a common access point. I have used
the
>
> Apache Commons pooling and DBCP support and they work well on the
> iSeries.
> If you decide to use these be aware that they are not well
documented
> and
> that it is easy to end up in a never ending wait. Two other open
source
> projects
> that provide pooling implementations are Poolman and Tyrex. These
last
> two
> seem to be losing momentum where the Commons projects are immature
but
>
> gaining momentum.
>
> David Morris