Re: CGI vs JSP...

["Seth Newton" <snewton@xxxxxxxxxxxxxxxxx>]

Brad,

RPGsp is smart enough to detect when only the HTML is changed, in which case
it saves off the HTML, and does not recompile the RPG code.

I ran some performance tests on RPGsp vs. CGIDEV2 and the results were
astounding.

My example displayed 1000 rows of dynamic data.  Each row had 30
substitution variables.  I basically used the same HTML and RPG code in both
tools.  I displayed a timestamp at the top and bottom of the page.

RPGsp consistently displayed the information in 0.2 to 0.3 seconds.

CGIDEV2 was consistently between 8 and 10 seconds, about 30 times slower.

By the way, I ran this on a 520 500 CPW machine, and I did turn debugging
off in CGIDEV2.  I am convinced now more than ever that RPG CGI is faster
than Java and any studies that show otherwise are based on specific tools
that may not implement CGI efficiently.

Seth Newton
snewton@xxxxxxxxxxxxxxxxx
Profound Logic Software, Inc.
Toll-Free: (877) 224-7768 x115
Fax: (603) 849-7757

RPGsp - iSeries Web Development has never been this easy!
Watch video demos: http://www.profoundlogic.com/video_demos/


------ Original Message ------

So if the template changes, that means a recompile though, right?  Now, I
know that a recompile shouldn't be a "big deal", but I know one of the nice
things about CGIDEV2 or other packages is that you don't have to recompile,
just change the template.  Sometimes that feature outweighs the milliseconds
one may save.  I used to say "who cares if I recompile", but once I found I
didn't have to, it was something I almost couldn't live without.

But, I would be curious as to some speed tests as well.
 Theoretically RPGSPs can't be faster than raw CGI unless they use something
else in the background.  

The only reason I ask is, with my tests, on newer machines I haven't seen a
noticable difference between CGIDEV2, eRPG SDK or raw RPG-CGI.  The
bottleneck is the HTTP server (or the QtmhWrStout API) not being able to
spit out the data fast enough, and/or the network.

AS an example, I ran some tests on eRPG SDK vs CGIDEV2 on a VLP machine from
IBM (a 570 partition I think).  Well, I couldn't get the execution of either
to be more than a second until I went up to 50,000 iterations.  Even then
while the app took a second to run, it probably took my browser 30 seconds
to load the data.

Brad