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From Tony Anecito <adanec...@yahoo.com>
Subject Re: IIS7/isapi/tomcat performance
Date Tue, 01 Mar 2011 21:07:58 GMT
Thanks Chris I will take a look at it.

I am just trying to figure out what is the fastest was to handle my app. I was 
shooting for less than 1msec at Tomcat which I not have done. Now I want to get 
to 100 microseconds. Years ago from an logical architecture standpoint It was:
1. Apache web server - JBoss, then 
2. Apache - Tomcat - JBoss
3. APR/Tomcat - JBoss. 

Then I drilled down into and refactored some of my code then finally looked at 
different types of web services and how fast and maybe why they might be slow.

I currently am using 200MB xmx, xms, -server, NUMA, and set my new generation to 
be large since my objects are short lived. I do not remember my other settings. 
I am beginning to think simpler is better for settings since at 1msec or less 
any time spent by the processor might be wasted time.

I am very curious how you got 50K requests per second. I can get 1K per second 
on my AMD 6 core system. What was your client setup? I ran my client on the same 
server as my APR/Tomcat-JBoss and I am setting up the client on a laptop so I am 
not sharing resources. For the client I am using ApacheHttp class running in 
Eclipse and launch each http request in a different thread. I ended 
upĀ configuring Tomcat for 400 connections which made a big difference. I still 
have alot more testing/tuning to do and I hope to get to it over the next couple 
of evenings.

-Tony



----- Original Message ----
From: Christopher Schultz <chris@christopherschultz.net>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Tue, March 1, 2011 1:42:37 PM
Subject: Re: IIS7/isapi/tomcat performance

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Tony,

On 3/1/2011 2:49 PM, Tony Anecito wrote:
> I understand it is from the core AWS but the important thing for me was to 
> eliminate AJP because in a AWS standalone I had used to communicate AJP.
> When I enabled ARP I did not have to do anything with AJP.
> 
> So does ARP communicate with the servlet conatiner in a more efficiant manner?

(Presuming s/ARP/APR/g)

APR is just a connector strategy, like the BIO or NIO connectors. There
are APR connectors for both HTTP and AJP.

If you're saying that you switched from BIO/AJP to APR/HTTP, I'm not
surprised you experienced a performance improvement: you're eliminated
the web server altogether.

If instead you are still using a web server out front and using HTTP
instead of AJP to communicate with the back-end, I'd be interested in
your configuration, environment, and observed performance gain.
Generally speaking, use of AJP is slightly faster than proxied HTTP but
there are certainly some trade-offs (like lack of encrypted
communication support for AJP).

APR handles connections differently than the Default BIO connector. See
http://tomcat.apache.org/tomcat-6.0-doc/config/http.html#Connector%20Comparison
for notes about the relative capabilities of the connectors (for HTTP).
There is
no NIO connector for AJP, but I would imagine that the comparison between
the other two HTTP connectors is applicable to the AJP connectors as well.

- -chris
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