RE: Servlet Load Times under WAS on an iSeries!

>
> I think we'd all appreciate hearing from anybody else about this,
> especially
> the L2 cache issue.
>

If this particular as/400 doesn't have L2 cache then WAS performance will
suck.  Period.

There's a lot about this at ignite400.org archives.

Phil


> -----Original Message-----
> From: java400-l-admin@midrange.com
> [mailto:java400-l-admin@midrange.com]On Behalf Of Sal Stangarone Jr.
> Sent: Wednesday, September 12, 2001 3:02 PM
> To: java400-l@midrange.com
> Subject: RE: Servlet Load Times under WAS on an iSeries!
>
>
> Sorry, I didn't add this earlier, I was out to lunch.  Our machine is at
> V4R5 and has a CUM package likely from this Spring.  The machine is set to
> adjust performance pools on the fly.  I guess I'm wondering if this is a
> hardware issue or a WAS issue.  David's post leads me to believe that this
> has more to do with WAS.  Maybe I need to try Tomcat on my AS/400 as well.
> I just didn't want to go down that route if other people already have.
>
> Sal
>
> -----Original Message-----
> From: java400-l-admin@midrange.com
> [mailto:java400-l-admin@midrange.com]On Behalf Of Blair Wyman
> Sent: Wednesday, September 12, 2001 1:51 PM
> To: java400-l@midrange.com
> Subject: RE: Servlet Load Times under WAS on an iSeries!
>
>
>
> I must admit that the hardware aspect didn't occur to me at first, though
> the long startup time -- relative to total run time -- seems somewhat
> incongruous.
>
> It might be worth watching WRKSYSSTS to see if the storage pools appear
> fairly balanced as the servlet runs.  (Thrashing is a potential problem on
> any '400 if the pools aren't properly balanced.)  Also, knowing the
> Version/Release/Modlevel of the operating system could still be helpful.
>
> -blair
>
> Blair Wyman -- iSeries JVM -- (507) 253-2891
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> "I was born not knowing, and have had only a
> little time to change that here and there."   -- Richard P. Feynman
>
>
>
>
>                     "Joe Pluta"
>                     <joepluta@PlutaBro       To:
> <java400-l@midrange.com>
>                     thers.com>               cc:
>                     Sent by:                 Subject:     RE: Servlet Load
> Times under WAS on an iSeries!
>                     java400-l-admin@mi
>                     drange.com
>
>
>                     09/12/2001 11:19
>                     AM
>                     Please respond to
>                     java400-l
>
>
>
>
>
> I talked to Sal about this offline, just to make sure I understood, and we
> came to the conclusion that it's probably his machine.  Sal's running a
> 270-2248, and we've both heard whispers that it doesn't have an L2 cache,
> unlike my 270-2250.  Also the 2248 has a CPW of 150, and the 2250
> has a CPW
> of 370, and my machine has twice the memory of Sal's.
>
> All these together make my machine run maybe 10 times faster on an initial
> servlet load.  There's little or nothing that can be done about
> that, short
> of preloading the servlets.
>
> I think we'd all appreciate hearing from anybody else about this,
> especially
> the L2 cache issue.
>
> Joe
>
>
> > -----Original Message-----
> > From: Sal Stangarone Jr.
> > Sent: Wednesday, September 12, 2001 10:02 AM
> > Subject: Servlet Load Times under WAS on an iSeries!
> >
> > I have some simple servlets that I've deployed on our iSeries
> > under both WAS
> > 2.02 and 3.5.2 and in both instances the initial load times are
> > unacceptable
> > (15 seconds or more).  Once loaded they perform well (under 2 seconds).
> I
> > know I can have the Servlets loaded as part of the WAS startup but I
> don't
> > understand why these servlets take so long to load on our iSeries.  I've
> > deployed the same servlets to a standalone PC utilizing Tomcat as
> > the server
> > and I see minimal (under 5 seconds) startup time needed there
> even though
> > its a small PII 233 PC.
> >
> > I have tried optimizing my class file to opt 40 and while that has some
> > effect it's minimal.  Has anyone else experienced this?  Is this WAS or
> my
> > iSeries any ideas?
>
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