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
--
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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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