My questions are more basic. We don't have a performance problem. The
application is not up yet.
BEA's website states 8.1 SP4 is certified for SLES9. We created a 64-bit
SLES9 and installed Weblogic 8.1.
But then it also states you need to download the 31-bit IBM JDK from the
developers site. Is this an error?
I do have a case open with BEA to ask what IBM JDK to use and if
Weblogic 8.1 exploits 64-bit.
So far I have not received the answers.
The customer application we will be testing currently runs under Solaris
and has a Weblogic startup script with SUN specific options that cannot
be used on zseries. I also don't know that the heap sizes on SUN would
be very good on zseries. In the past IBM had recommended 'mapped_base'
for other 31-bit apps in the past. I was hoping that not too many
special java options are needed to run under zseries. I also hoped BEA
has suggestions for heap sizes- they may, I just haven't found them yet.
We had a POC with another product a couple years back and the customers
were never satisfied with the IBM java options. But that was java 1.3.1
and a less highly used vendor product. Since I know other companies are
running Weblogic I was hoping for some pointers. We also may end up
contacting the IBM java experts if it comes to that. I did ask the
customer area to add verbose:gc to the startup script. When the customer
tried to startup Weblogic using the same min and max heap sizes as on
SUN they get:
Compilation of
'/tech/webmstr/apps/agency/./config/PL/agency_01/.wlnotdelete/extract/ag
ency_01_agency_agencyWEB/jsp_servlet/_auto/_specialty/__vehiclequote.jav
a'
failed:
(Failed to parse compiler output. See full output below).
Full compiler error(s):
java.io.IOException: Cannot allocate memory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(UNIXProcess.java:157)
at java.lang.ProcHelper.run(ProcHelper.java:60)
I did find they have an environmental variable set incorrectly:
LD_LIBRARY_PATH=$WL_HOME/lib/solaris
I asked them to correct this.
-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Marcy Cortes
Sent: Thursday, April 20, 2006 4:27 PM
To: [email protected]
Subject: Re: IBM java options for Weblogic under zseries linux
Apparently it's very easy to write java code that is less than
efficient! You just notice it more under z because you typically look
and you typically don't have your own dedicated machines. Do you have
tools on your Java to drill down to where the application is spending
all it's time? Wily Introscope and JPROBE are two examples.
Our app folks first pointed to infrastructure (z HW and VM). Then
networking... All of that was examined, tuned, and tweaked. No major
improvements. Then they starting bringing in the IBM java experts. Gave
them back about an order of magnitude (20+ IFL projected down to a
respectable 2 point something). Problem is that you probably won't be
able to tell them that. Luckily IBM had done the initial sizing here :)
Marcy Cortes
"This message may contain confidential and/or privileged information.
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-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Dave Jones
Sent: Thursday, April 20, 2006 12:52 PM
To: [email protected]
Subject: Re: [LINUX-390] IBM java options for Weblogic under zseries
linux
Ann,
take a look at this web site:
http://www.velocity-software.com/
They seem to have a handle on Linux performance issues under VM.
DJ
Smith, Ann (ISD, IT) wrote:
> We currently are running a Weblogic POC - Weblogic 81. SP4 with SLES9
> under z/VM.
> The customers currently run the applications on SUN Solaris and use
> some SUN java hotspot options.
> Does anyone have suggestions or know where I can find doc on IBM java
> options to help performance when running Weblogic under zseries linux?
>
>
>
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