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It seems to me that WebSphere takes an extraordinary amount of time and
resource to get started, and that the Admin Console uses a crazy amount of
AS/400 resource, but that once it's up and running it's not at all greedy.
So you need shedloads of main storage, but mainly just to start it up ...
which I find frustrating when I'm recommending boxes to customers. It's
fine if WAS is a strategic middleware product for them, but if this is
their first WebSphere application & it has just a few servlets, they can't
see why they should need all that resource, and you can't blame them. WAS
3.n has fabulous functionality, but I can't help thinking we could do with
a 'baby' WAS offering as an entry level ... not to mention a green screen
command configuration option a la Domino.
Mandy
"Joe Pluta" <joepluta@PlutaBrothers.com> on 01/03/2001 22:54:20
Please respond to JAVA400-L@midrange.com
To: JAVA400-L@midrange.com
cc: (bcc: Mandy Shaw/Pacific/UK)
Subject: RE: Java and CPU
I guess it depends on your application, Brad. I just ran an informal test
on my machine. I loaded my server from scratch, which took about 45
seconds
or so of CPU time - it takes a while to load all that good stuff. Then I
made 200 or 300 hits to my server, the total was about another 30 seconds
or
so. Let's see my results from here:
QBASE SBS 2 0 2.2 0 .0
LINLST BCH 2 50 3.6 0 3.6
QPADEV0002 INT 3 20 .7 1 .0 0 .0
QSYSSCD BCH 3 20 .3 0 .0
QEJBSBS SBS 2 0 .0 0 .0
DEFAULT_SE BCI 2 25+ 24.2 0 10.4
QEJBADMIN BCI 2 25+ 58.1 0 .1
QEJBMNTR ASJ 2 25 .0 0 .0
Note that LINLST is the RPG program actually servicing the result. He does
all the actual database I/O. So let's see. I'm going to do another 200
hits.
QBASE SBS 2 0 2.2 0 .0
LINLST BCH 2 50 10.6 0 2.2
QPADEV0002 INT 3 20 .7 2 .0 0 .0
QSYSSCD BCH 3 20 .3 0 .0
QEJBSBS SBS 2 0 .0 0 .0
DEFAULT_SE BCI 2 25+ 44.5 0 6.6
QEJBADMIN BCI 2 25+ 58.5 0 .1
QEJBMNTR ASJ 2 25 .0 0 .0
Okay, 200 hits (actually, I lost count so I did an extra 40 hits, so this
could be anywhere between 200 and 240 hits, but let's say 200 for
argument).
I was putting out the following screen, all data being read from files on
the AS/400:
Kenosha Weekday Inbound
Train #300
Station Time
Kenosha ----
Winthrop Harbor ----
Zion ----
Waukegan 4:58
North Chicago 5:01
Great Lakes 5:05
Lake Bluff 5:10
Lake Forest 5:13
Fort Sheridan 5:16
Highwood 5:19
Highland Park 5:22
Ravinia 5:25
Ravinia Park ----
Braeside 5:27
Glencoe 5:30
Hubbard Woods 5:33
Winnetka 5:36
Indian Hill 5:38
Kenilworth 5:40
Wilmette 5:42
Central Street 5:45
Evanston 5:49
Main St. 5:51
Rogers Park 5:54
Ravenswood 5:59
Clybourn 6:06
Chicago 6:15
There are also a few buttons. What I did was page up and down through ten
different schedules, and I did that 10 times, for a total of 200 pages.
So, we can see that I consumed 7 seconds RPG time, 20 seconds server time
and pretty much zero administration time. Extrapolated to your benchmark
of
7000 page hits, my application would consume about 700 seconds of HTTP
server time, and maybe 250 seconds of RPG server time. These numbers are
less than 2/3 those of your CGI application. They're more than 100 times
better in performance than your Java version, which doesn'teven do any
database I/O.
Now, things that can greatly increase those numbers include starting and
stopping server instances and creating new Java Server Pages. The latter
in
particular can cause lots of work, because they have to be unloaded,
compiled, and reloaded. Have you been making lots of changes to your JSPs?
That number shows up in the QEJBADMIN number, I'm pretty sure.
The other load might be from how you're "Java-izing". As you can see, my
programs don't have nearly as much load per page - I'm talking overhead of
less than 100 msec a page, while you're seeing closer to a 30 seconds. I
don't know why, but you might want to start putting some trace statements
in
your code to determine where your bottlenecks are.
Good luck!
Joe
BTW, for anybody who might wonder how to architect an RPG program that
performs so well as a web application, it's actually a revitalized green
screen program. That means it runs in green screen using a display file
AND
as the server for the web, WITHOUT changes. Here's the same program run
interactively:
STNSTP-01 Stop Master List
3/01/01
SECJDP For Line: Union Pacific North Line
17:46:24
For Schedule: Kenosha Weekday Inbound
For Train: 00300
Station Time
Kenosha ----
Winthrop Harbor ----
Zion ----
Waukegan 4:58
North Chicago 5:01
Great Lakes 5:05
Lake Bluff 5:10
Lake Forest 5:13
Fort Sheridan 5:16
Highwood 5:19
Highland Park 5:22
Ravinia 5:25
Ravinia Park ----
Braeside 5:27
Glencoe 5:30
More...
F3=Exit F19=Previous F20=Next
Pretty cool, eh? This is what I teach...
<grin>
> -----Original Message-----
> From: owner-java400-l@midrange.com
> [mailto:owner-java400-l@midrange.com]On Behalf Of Stone, Brad V (TC)
> Sent: Thursday, March 01, 2001 2:35 PM
> To: 'JAVA400-L@midrange.com'; ign_list@ignite400.org
> Subject: Java and CPU
>
>
> This I found interesting.
>
> We have an AS/400 that is a web server only. We're running CGI to do
> customer service online for multiple customer/catalogs. Right now it's
> about 30 sites (all using the same 3 or 4 programs, webfacing controled
by
> config files, SSIs, etc..).
>
> Some CPU stats for the normal HTTP Server: (jobs entered system
2/14/2001)
> Subsystem/Job Type Pool Pty CPU
> CSO BCH 2 25 1516.4
> CSO BCI 2 25 .1
> CSO BCI 2 25 .3
> CSO BCI 2 25 69.0
> CSO BCI 2 25 26.1
> CSO BCI 2 25 727.4
>
> Now, I have also have websphere running. I've been trying to
> duplicate this
> CGI system using servlets and and making progress (no wonder I'm asking
so
> many questions!).
>
> Anyhow Here's the CPU stats for the default WAS server that is processing
> the servlets: (entered system 2/19/2001)
>
> Subsystem/Job Type Pool Pty CPU
> DEFAULT_SE BCI 2 25+ 2847.7
> QEJBADMIN BCI 2 25+ 6203.9
> QEJBMNTR ASJ 2 25 .1
>
> The HTTP server has received about 7000 hits since it started on
> 2/14/2001.
> This server serves up those 30 sites and is available 24/7.
>
> The WAS server hasn't even broken a couple hundred hits since it's only
me
> testing when I have time (started on 2/19/2001). It's not
> available to the
> interent and I am the only developer on the box.
>
> The Java version of the application isn't querying customer service data
> yet, I'm simply building the web pages. The CGI programs run dynamic
SQLs
> to select and display data depending on customer signon information.
>
> The numbers compared to just the default WAS server may be close, but
> remember, it's doing about 1/100th of the work right now.
>
> Any thoughts, ideas, or otherwise? I'm really wondering why so much more
> CPU is used. If I were to take my app and java-ize it, it looks like it
> would bury the current machine we are using.
>
> Last question, does WAS start more instances when it needs to
> them to handle
> more requests like the HTTP server does? What about the new
> Apache server,
> does it start more jobs to handle more requests?
>
> Thanks!
>
> Brad
>
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Regards,
Mandy Shaw
Catalyst Solutions plc
Kingfisher House
Frimley Business Park
Camberley
Surrey
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UK
http://www.catalyst-solutions.com
Email: Mandy.Shaw@uk.catalyst-solutions.com
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