java applications taking up too much memory

[Brian John]

Hello,
It seems that my java applications are taking up a ton of memory. Even
one small jar that I start at startup takes up almost 200 MB!

I start it like this:
java -Xms4m -Xmx8m -jar /home/brian/serverWatcher/serverwatcher.jar &
and it looks like this in top:
76750 brian 20 0 159M 10840K kserel 0:03 0.00% 0.00% java

I start Azureus like this:
azureus -Xmx128m
and it looks like this in top:
59636 brian 20 0 503M 228M kserel 2:37 0.00% 0.00% java

I only have 512M of memory on this machine. Does anyone have any idea
how I can make these apps take up less memory?

Thanks

/Brian

[Ted Mittelstaedt]

Hi Brian,

First you should ask on the freebsd java mailing list, not here.

Second, 200MB of ram isn't that big anymore these days for a server,
you might consider your system needs more? Java isn't know for small
programs. Java's strength is it's write-once, run-anywhere feature,
and as a result it's going to be much more resource consumptive than
a compiled C program.

Last, most of this will probably be swapped out, so what you want to
pay attention to in top is the Swap: line. When your app starts, you
should see swap loaded up - what you should be concerned with is if
you see a lot of in-and-out on the ram allocated, also you might try
running

systat -vmstat

you will get a better idea of what your system is doing that way
rather than just looking at top's output.

Ted

> -----Original Message-----
> From: [email]owner-freebsd-questions@freebsd.org[/email]
> [mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Brian John
> Sent: Tuesday, February 22, 2005 5:47 PM
> To: [email]freebsd-questions@freebsd.org[/email]
> Subject: java applications taking up too much memory
>
>
> Hello,
> It seems that my java applications are taking up a ton of
> memory. Even
> one small jar that I start at startup takes up almost 200 MB!
>
> I start it like this:
> java -Xms4m -Xmx8m -jar /home/brian/serverWatcher/serverwatcher.jar &
> and it looks like this in top:
> 76750 brian 20 0 159M 10840K kserel 0:03 0.00% 0.00% java
>
> I start Azureus like this:
> azureus -Xmx128m
> and it looks like this in top:
> 59636 brian 20 0 503M 228M kserel 2:37 0.00% 0.00% java
>
> I only have 512M of memory on this machine. Does anyone have any idea
> how I can make these apps take up less memory?
>
> Thanks
>
> /Brian
> _______________________________________________
> [email]freebsd-questions@freebsd.org[/email] mailing list
> [url]http://lists.freebsd.org/mailman/listinfo/freebsd-questions[/url]
> To unsubscribe, send any mail to
> "freebsd-questions-unsubscribe@freebsd.org"
>