java applications taking up too much memory

Ted Mittelstaedt tedm at
Wed Feb 23 08:56:39 GMT 2005

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

systat -vmstat

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


> -----Original Message-----
> From: owner-freebsd-questions at
> [mailto:owner-freebsd-questions at]On Behalf Of Brian John
> Sent: Tuesday, February 22, 2005 5:47 PM
> To: freebsd-questions at
> 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
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