java = lunching on your Available Mem
One thing you can try if you do not have much else on the box is to turn off
your swap. Java is really bad about wanting what it cant have.
Jason Allison
Principal Engineer
ARINC Incorporated
Office: (410) 266-2006
FAX: (410) 573-3026
-----Original Message-----
From: Jane Curry [mailto:jane.curry@skills-1st.co.uk]
Sent: Monday, May 12, 2003 2:25 PM
To: Barr, Scott; NetView mailing list
Subject: Re: [nv-l] java hogging CPU
Hi Scott,
Re memory - I can definitely confirm that java gives you horrible
thrashing if you don't have enough memory. I was running on a 256Mb
machine until lunchtime when the extra 256Mb arrived. This does make
some things a little faster (like it only takes half forever to, say,
bring up web console security); the bad news is that the extra memory
just seems to move the bottleneck to CPU. This system now has 512Mb
memory and runs NV7.1.3 and Switch Analyzer with a tiny database of 80
objects - nothing else other than AIX 5.1 ML03 at present.
For comparison, I was recently using OpenView NNM 6.4 on a 384Mb Solaris
2.8 system and it's Web Console I have to say was much faster compared
with my 512Mb RAM NV Web Console on AIX. Perhaps they know how to tune
java????
Cheers,
Jane
Barr, Scott wrote:
>I share your concerns 100%
>
>My hunch is that the machine (Solaris in my case) is getting hammered
swapping because the basic memory allocation for a java environment is too
small for the actual application. The web console wants about 71mb for
instance, but the basic allocation is 64 mb and there fore, no matter what,
you spend your time swapping java back in and out. Janes comment about it
being pure CPU don't jive with that, so I could be wrong.
>
>If I had any number of web console users this would be a significant
concern. But Jane's point is right on the money, it consumes entirely too
much of the machine.
>
>I have heard that using an alternate java deployment (such as IBMs) can
help, but I don't know whether AIX uses that nifty IBM java machine or
whether it uses a stock one.
>
>-----Original Message-----
>From: Jane Curry [mailto:jane.curry@skills-1st.co.uk]
>Sent: Monday, May 12, 2003 12:13 PM
>To: NetView mailing list
>Subject: [nv-l] java hogging CPU
>
>
>Is anyone else really bored by the way NetView's java processes (jetty
>and snmpserver in particular) just max out an AIX system on CPU? I've
>recently built a NV 7.1.3 on AIX 5.1 hoping for better things but java
>still hogs most of the resources - it's pure CPU, there's no thrashing
>going on. Add on a TEC java console or something like CiscoWorks and
>you can simply forget it.
>
>I tried Oliver's suggestion about looking at AIX manuals on Java tuning
>(with AIX 4.3.3) but this didn't really help.
>
>Does anyone have any good, specific recommendation for tuning java for
>NetView on AIX?
>
>Thanks,
>Jane
>
>
>
--
Tivoli Certified Consultant & Instructor
Skills 1st Limited, 2 Cedar Chase, Taplow, Bucks, SL6 0EU, UK
Tel: +44 (0)1628 782565
Copyright (c) 2003 Jane Curry <jane.curry@skills-1st.co.uk>. All rights
reserved.
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