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From Clinton Begin <clinton.be...@gmail.com>
Subject Re: Java reflection performance
Date Fri, 13 Mar 2009 17:01:20 GMT
I recommend:

  * Write the code you're worried about.
  * Test it.
  * If it's fast enough, don't worry about it.
  * If it's not, return to the first step and try something else.

Technical spikes answer questions in a more relevant way than general
discussion.

Clinton

On Fri, Mar 13, 2009 at 10:46 AM, Ivan Bojer <Ivan.Bojer@citrix.com> wrote:

>  I am really trying to understand performance issues. I agree with you
> that real-time apps will suffer, but if I am writing a controller for a get
> plane I would not use any O/R mapping tool obviously. You really want to run
> on bare metal there.
>
> So, real-time app definition is quite fuzzy and I personally think that it
> is quite ambiguous term. Back to my question, we are actually working on
> network policy appliance (think layer 7 packet switching). Can this qualify
> as  close to a real-time application. It depends if you ask network guy or
> the application guy :)
>
> I think that we are close enough to worry about performance and to be
> diligent to do anything that can speed up any layer of application (short of
> going directly into assembly code :) ).
>
> This is the reason why I asked the question. If someone can tell me that
> writing result maps will give me 10%,20%,30% performance improvement that
> will tell me something. Beside all of this I am really just curious from the
> geekness factor on why is there a difference.
>
> Thank you for your answer.
>
>
> *From: *Kengkaj Sathianpantarit <kengkaj.s@gmail.com>
> *Reply-To: *IBatis <user-java@ibatis.apache.org>
> *Date: *Fri, 13 Mar 2009 06:35:03 -0700
> *To: *IBatis <user-java@ibatis.apache.org>
> *Subject: *Re: Java reflection performance
>
>
> By realtime applications, I just mean applications that the timing is
> really important.
> From your example, for retrieving an account balance, the system slowdown
> sometimes for 10 seconds is bad, but there is nobody dies or losses big
> benefit because of it.
> But for jet fighters, it's a different story.
>
> This is an off-topic, if you want discuss further, please discuss with me
> via e-mail.
>
> Best Regards,
> Kengkaj
>
> On Fri, Mar 13, 2009 at 8:16 PM, Chris O'Connell <
> oconnell@gorillachicago.com> wrote:
>
> I'm curious what you mean by 'realtime application'.  Not trying to be
> confrontational, but do you mean like the difference between writing
> controls for a jet fighter vs. retrieving an account balance?  I've always
> thought they were both 'realtime'.  Just a difference in semantics, I'm
> sure, but I am curious what you mean.
>
> Thanks,
> Chris
>
>
> On Fri, Mar 13, 2009 at 1:21 AM, Kengkaj Sathianpantarit <
> kengkaj.s@gmail.com> wrote:
>
> It is "slower", because it has more things to do, but if you're not
> implementing realtime application, this should not be an issue.
>
> Kengkaj
>
>
> On Fri, Mar 13, 2009 at 11:47 AM, Ivan Bojer <Ivan.Bojer@citrix.com>
> wrote:
>
> Ibatis documentation states that there is performance gain if one uses
> resultmaps instead of letting Ibatis figure out class mapping on its own. I
> could not find any more info about why is this a case!? Can anyone elaborate
> on this? Is this because reflection is slow in general?
>
>
>
>
>
> --
> --
> Chris O'Connell
> Application Developer
> Gorilla
> 312.243.8777 x19
>
>
>
>

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