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From "Seth Newton" <snew...@keithley.com>
Subject Re: Memory Leak with static content
Date Mon, 15 Sep 2003 17:33:42 GMT
All,

Updates to this issue....

-I'm not sure if it's the OS, but I've never seen this happen before on
other Solaris installs.  What would I look at to determine if it's the OS?..
The way that question is phrased makes it difficult for me to completely
understand what you mean. Can you be more specific?
-It did take up memory until Tomcat would no longer serve pages.  Users
would try to see their sites and just get a blank white screen until their
request timed out.  I haven't let it time go incrementally since I've
upgraded Tomcat or the jdk, however, I may let it stall out if I get that
desperate.
-I upgraded to 1.4.2 and still the memory increases.
-Yes, I'm closing all streams in the email class.  Also, this particular
code has been used successfully across platforms and across java servers for
about 3 years now.

Anymore input is greatly appreciated.

-Seth.
----- Original Message ----- 
From: "Nikolaos Giannopoulos" <nikolaos@solmar.ca>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Friday, September 12, 2003 6:04 PM
Subject: RE: Memory Leak with static content


> Seth,
>
> Have you tried JDK 1.4.2?  1.4.0 has been known to have a memory leak in
the
> StringBuffer implementation w.r.t. re-using StringBuffers but you mention
> that your only serving static content so this may not be it.
>
> However, I believe that I read that something like 2000 bugs have been
fixed
> in 1.4.2 (if my memory serves me well).  We have have no visible problems
> running tomcat 4.1.12/18 stand alone w/ 1.4.2 on Solaris 8 on 4 boxes (no
> JSPs - just servlets and static content).
>
> Please reply back if this works or does not work for you - we are looking
at
> upgrading our Tomcat instances in the near future.
>
> HTH.
>
> --Nikolaos
>
>
> > -----Original Message-----
> > From: Seth Newton [mailto:snewton@keithley.com]
> > Sent: Friday, September 12, 2003 4:58 PM
> > To: tomcat-user@jakarta.apache.org
> > Subject: Memory Leak with static content
> >
> >
> > All,
> >
> > OS: Sparc-Solaris 9
> > JDK: 1.4.0_02
> > Tomcat: 4.1.27
> >
> > Problem:
> > I start tomcat and it takes up about 45MB of RAM.  I wrote a
> > script to email me every ten minutes the amount of memory it's
> > taking up.  The results are showing me that it gains about 1MB
> > every 10 minutes or so (on average).  If I let it go, it will
> > grow until it runs out of memory.  Right now, I have a script to
> > restart tomcat after the memory is too high.  This is a bad
> > solution.  I've looked at a LOT of people's suggestions from
> > other threads, and I have tried the following:
> >
> > -Use jikes
> > -Set development to false in web.xml
> > -Increase the heap sizes
> > -set fork to true in web.xml
> >
> > Other Info:
> > -I'm using Tomcat to feed about 6 sites with static content.  I
> > have one jsp page that handles all of our forms, and all that
> > does is capture the <input> and send it to an email address.  It
> > is the only code I have anywhere.  This jsp page is not causing
> > the memory leak.
> > -I had the same problem with 4.1.17, and was hoping that an
> > update would help, but it didn't.
> > -This is an incremental increase, and doesn't seem to have much
> > to do with traffic patterns or how much I use my one jsp page.
> >
> > Any suggestions would be great.
> > -Seth.
>
>
>
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