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My final (OT) post on this...when we had this problem, the CPU actually
went to 100% (NT server 4.0, Sp6). To test the theory a program
was written that did nothing but call the garbage collector every
30 seconds. Watching the CPU meter in the task manager showed a
spike every 30 seconds.
There may be other reasons why this is happening with Jserv, but
this is one thing I noticed with Java (1.1, haven't tried with 2) and
NT.
Don Pierce wrote:
>
> ----------------------------------------------------------------
> BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> WHEN YOU POST, include all relevant version numbers, log files,
> and configuration files. Don't make us guess your problem!!!
> ----------------------------------------------------------------
>
> I do not understand how the garbage collection would make the
> JVM CPU usage jump to 50%.
>
> Could JServ trigger the JVM to jump like that.
> If so how? How could I monitor this to see what causes this.
>
> The logs have basically been useless. Do the JServ logs
> reflect any messages coming from the JVM?
>
> Are there monitoring tools for NT to determine how this happens?
>
> Don
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Chris
> > Cheshire
> > Sent: Tuesday, July 25, 2000 9:22 AM
> > To: Java Apache Users
> > Subject: Re: JVM and 50% CPU usage
> >
> >
> > ----------------------------------------------------------------
> > BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> > WHEN YOU POST, include all relevant version numbers, log files,
> > and configuration files. Don't make us guess your problem!!!
> > ----------------------------------------------------------------
> >
> > This could be the JVM garbage collecting. I have seen this
> > on java apps as well.
> >
> > Don Pierce wrote:
> > >
> > > ----------------------------------------------------------------
> > > BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> > > WHEN YOU POST, include all relevant version numbers, log files,
> > > and configuration files. Don't make us guess your problem!!!
> > > ----------------------------------------------------------------
> > >
> > > So once you enlarged the disk space the problem went away?
> > > I have a couple gig available so I guess that is not my problem.
> > >
> > > Thanks anyway
> > >
> > > Don
> > >
> > > > -----Original Message-----
> > > > From: [EMAIL PROTECTED]
> > > > [mailto:[EMAIL PROTECTED]]On Behalf Of CN Davies
> > > > Sent: Monday, July 24, 2000 11:11 AM
> > > > To: Java Apache Users
> > > > Subject: Re: JVM and 50% CPU usage
> > > >
> > > >
> > > > ----------------------------------------------------------------
> > > > BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> > > > WHEN YOU POST, include all relevant version numbers, log files,
> > > > and configuration files. Don't make us guess your problem!!!
> > > > ----------------------------------------------------------------
> > > >
> > > > I Had a similar problem with JavaWebserver when we were running low on
> > > > disk space on C: Jrew was dominating the CPU so much it would take 5
> > > > minutes to simply log in.
> > > >
> > > > Chris
> > > >
> > > > On Sun, 23 Jul 2000 21:28:52 -0700, Don Pierce wrote:
> > > >
> > > > >----------------------------------------------------------------
> > > > >BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
> > > > >WHEN YOU POST, include all relevant version numbers, log files,
> > > > >and configuration files. Don't make us guess your problem!!!
> > > > >----------------------------------------------------------------
> > > > >
> > > > >I recently installed the following:
> > > > >1.3.12 and JServ 1.1.2 on NT4 with JDK 1.1.8
> > > > >
> > > > >All seems to run fine and the CPU is about 3-5%
> > > > >Very low - then at random times it will jump
> > > > >to 50% and I find that java.exe is what is
> > > > >using it.
> > > > >
> > > > >I see no real correlation in any of the error logs
> > > > >to these CPU jump events. The server still running fine
> > > > >but I have had Apache JServ lose it's connection to
> > > > >Apache a couple times (usually after a couple hours at 50%).
> > > > >I have even had it run at 50% for 2 days and have had no problems.
> > > > >
> > > > >Anyone seen this before?
> > > > >What kind of tools could I use to diagnose the problem?
> > > > >The performance monitor does not help much in this case.
> > > > >
> > > > >Don
> > > > >
> > > > >
> > > > >--
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> --
> Chris Cheshire
> Manager of Software Development
> bigredwire.com
> Phone : +1 805 560 6666 (w)
> +1 805 559 9166 (m)
> Fax : +1 805 560 8901
> Email : [EMAIL PROTECTED]
>
> Real Programmers don't draw flowcharts.
> Flowcharts are the illiterate's form of
> documentation. Cavemen drew flowcharts;
> look at how much good it did for them
>
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Chris Cheshire
Manager of Software Development
bigredwire.com
Phone : +1 805 560 6666 (w)
+1 805 559 9166 (m)
Fax : +1 805 560 8901
Email : [EMAIL PROTECTED]
Real Programmers don't draw flowcharts.
Flowcharts are the illiterate's form of
documentation. Cavemen drew flowcharts;
look at how much good it did for them
--
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