Changing amount of memory HQ server can use

[Simon_hyperic]

We have a server with 8gig of physical memory.

The Linux OS is taking about 512 mb and i would like to give hyperic server some more memory but not sure what would be the best configuration.

I would like to give it 4gig to play with ie the JVM.

It currently set at
server.java.opts=-XX:MaxPermSize=192m -Xmx512m

Does anyone have any suggestion on the best setting to have with that amount of memory I have to play with.

Cheers

Simon

[German Laullon]

Hi Simon

You can put it:

server.java.opts=-XX:MaxPermSize=192m -Xmx512m -Xms512m

or

server.java.opts=Xmx1024m -Xms1024m

[excowboy]

Hi Simon

> Does anyone have any suggestion on the best setting
> to have with that amount of memory I have to play
> with.

Give HQ Memory as much as you can, but think of other services for example if you run the HQ database on the same host.
Other important parameters: number of agents (and metrics) you want to monitor, number of HQ users and what kind of services you monitor.


>
> Cheers
>
> Simon

Cheers,
Mirko

[Simon_hyperic]

Cheers guys,

We have a seperate Oracle database server, so the app server just has hyperic engine to run.

So for 4gig I should be able to give it :

server.java.opts=Xmx4096m -Xms4096m ????

Also with regards to agent, I was looking at the tuning instructions, does anyone know where you change to max lather conns and database thread pool, they dont seem to be in the referenced files on the docs

Cheers

Simon

[Simon_hyperic]

I changed it to server.java.opts=-Xmx4096m -Xms4096m

Which it took, but now it has errors:

2008-01-31 12:59:50,156 INFO [RMI TCP Connection(98)-127.0.0.1] [STDOUT] java.lang.OutOfMemoryError: PermGen space

Lots of PermGen space reported in log.

So does the PermGen depend on the MaxPermSize size being set.

If so would it be better to put:

"-XX:MaxPermSize=192m -Xmx4096m -Xms4096m"

Can a higher MaxPermSize be used as well?

Cheers

Simon

[German Laullon]

I think that this two configurations are the best:

server.java.opts=-XX:MaxPermSize=192m -Xmx512m -Xms512m
OR
server.java.opts=-Xmx1024m -Xms1024m

4Gb is too much memory for a Java, the gc has a lot of work and it make decrement the performance.

[admin]

In general, the memory settings HQ runs with by default will be fine for most installations. The majority of memory usage is from HQ's internal caches which can be monitored via the "HQ Health" link in the administration section in 3.2.

Only in environments of 50 or more platforms should the memory settings need to be changed. In that case I'd recommend only bumping up the Xmx setting. In most cases -Xmx=1024m will be sufficient.

In either case the MaxPermSize setting is required, and should not need to be changed unless you run into Permgen errors.

-Ryan

[bclark_hyperic]

Thanks for the advice.

However, how do I change this setting with the Windows version of Hyperic HQ? I see where you would do it in hq-server.sh, but I don't think this is used on Windows. I start up the server with hq-server.exe, which is not a file that I can edit.

Thanks,
Brian

[German Laullon]

%SERVER_HOME%\conf\hq-server.conf

[admin]

> However, how do I change this setting with the
> Windows version of Hyperic HQ? I see where you would
> do it in hq-server.sh, but I don't think this is used
> on Windows. I start up the server with hq-server.exe,
> which is not a file that I can edit.

On Windows you can just pass the extra memory parameters to hq-server.exe when installing the service. I don't have a Windows machine handy to test, but an example would be:

hq-server.exe -i -Xmx1024m -XX:MaxPermSize=128m

-Ryan

[AnttiP_hyperic]

Haven't tested the GC tuning with HQ, but when one wants to adjust memory or other parameters on JVM process, there's two good articles to read on the topic:

Tuning Garbage Collection with the 5.0 Java[tm] Virtual Machine
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html

Java HotSpot VM Options
http://java.sun.com/javase/technologies/hotspot/vmoptions.jsp