You'd probably get a better response from the J2EE interest group, since
SilverStream is a J2EE app server. You can sign on at
java.sun.com/products/j2ee.
Cheers!
Mark
----- Original Message -----
From: "Frank Karlstr�m" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, June 29, 2001 2:01 AM
Subject: SilverStream eating memory
> Hello. I do not know if this is the right plce to post this question, but
I
> have seen some others having the same problem with other Application
> servers/servlet enginges....
>
> Symptom:
> Server is up and running in about one day, then it crashes, because the
> server runs out of available memory.
>
> Description:
> After a bit of memory debugging, it seems that our servlets and all
depended
> classes are almost GC'ed. But there always remains a 20 byte reference to
> the servlet and all depended classes. So if your servlet is somewhat
> complicated, this will eat your memory by 4K for every hit to your
servlet.
> when the memory consumption reashes the heap roof, Garbage-Collection
takes
> place, and the heap is enlarged.And so it continues from the beginning
until
> it runs of of heap space again.
> Again and again, until the heap can grow no more, and the JVM stops
> responding, often taking the OS down too.
> I have tried with a veeeeery simple servlet wich does nothing, and he same
> symptoms appear here.
>
> Simple source:
> public class SimpleServlet extends HttpServlet {
> public void doGet(HttpServletRequest req, HttpServletResponse res) {
> res.setContentType("text/plain");
> res.setStatus(res.SC_OK);
> PrintWriter out = res.getWriter();
> out.println("servlet worked, and now we have 20 bytes less
> memory.");
> out.flush();
> out.close();
> return;
> }
> }
>
>
>
>
> Partial solution:
> The only solution so far for this problem has been twofolded:
> 1. take a restart every day.
> or
> 2. have a thread running in the background doing a manual GC every now and
> then.
>
> None of these solutions are good ones. So if someone can point out to as
> what we are doing wrong, or show us a workaround, lives will definentily
be
> much easier.
>
> (PS. we are using SilverStream Application Server v. 3.7,
> Java JRE 1.3.0 with HotSpot VM 1.3.0-C, mixed mode)
>
>
> Best regard Frank Karlstr�m
> Web-developer/Java programmer
>
>
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