Re: Java and CPU (servlet and RPG/CGI speed compare)

I try to find out which one runs fast, servlet or RPG/CGI?

I wrote a RPG/CGI and a servlet. They display exactly the same data
retrieved dynamically from AS400. Then I wrote a java application to request
the CGI/servlet consecutively from my PC  (using URL API in LAN connection)

50 consecutive requests to CGI yields an average response time of 0.21
second per request

50 consecutive requests to servlet yields an average response time of 0.11
second per request

This is a bit surprising to me. I was expecting the servlet to be slower
than RPG/CGI due to the jdbc connection and java code execution speed. It
appears that both jdbc and java execution have greatly improved with V4R5.

Both RPG and servlet pages are similar to this:
http://www.crazybikes.com/I00090gc.mrc except in my tests I have 10 rows per
table instead of 5. The AS400 is a 270.

Bruce



-----Original Message-----
From: Larry Loen <lwloen@us.ibm.com>
To: JAVA400-L@midrange.com <JAVA400-L@midrange.com>
Date: Friday, March 02, 2001 8:44 AM
Subject: RE: Java and CPU



>Servlets can beat CGI in several circumstances, because it
>is basically firing up a waiting native thread instead of the potential
>for creating a new job, creating a new activation, etc. that can
>be part and parcel of running CGI.
>
>And, throw enough SQL DB in the mix or enough back-end RPG
>processing on the other end of a data queue or something,
>and you won't be able to tell which approach is faster,
>because the back end work will drown out the rest.
>
>Someone had a nice COMMON presentation explaining all
>this.
>
>Now, I'm not going to argue whether Java is faster, on average,
>than RPG.  I will tell you that when RPG is faster, it is not because
>the codegen quality is better for RPG; it has to do with how RPG invokes
>OS/400 services to advantage, which it was built to do (whereas
>Java uses only very generic interfaces).
>
>
>
>Larry W. Loen  -   Senior Java and AS/400 Performance Analyst
>                          Dept HP4, Rochester MN
>
>
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