RE: Java and CPU -- JAVA400-L

Joe,

My apps are just a "tad" more involved that your sample.  Not really a fair
comparison (I couldn't tell if you were comparing or not).

I'm not using any JSP right now, just servlets as CGI.

My problem may be how I'm doing DB i/o, and I plan on posting a small bean
that I'm using to see if anyone has any pointers.

Brad

> -----Original Message-----
> From: Joe Pluta [mailto:joepluta@PlutaBrothers.com]
> Sent: Thursday, March 01, 2001 4:54 PM
> To: JAVA400-L@midrange.com
> 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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