Hey there..using JDK 1.3.0 and 1.3.1 (two different boxes). I don't see the
-Xmn512M anywhere. I do the java -X to list, and I do see something about
incremental GC option...but nothing for -Xmn. Is this a different JVM your
using? Or is it JDK 1.4 your using?
> -----Original Message-----
> From: Josh P. Motto [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, July 25, 2001 2:38 PM
> To: Orion-Interest
> Subject: RE: Orion Performance Tuning
>
>
> Hello,
> I also found setting the Min and Max JVM memory
> settings (-xms####M and xmx####M) greatly
> improved performance.
>
> Here is another JVM trick I used that also helped
> - set the NEW GENERATION memory allocation
> higher... the switch is -xmn####M . This helps
> tune the JVM garbage collection and scavenger
> frequency to ensure discarded objects are removed
> efficiently without unnecessarily halting the
> system for a gc priority thread.
>
> I used -xmn512M and the system flies with no
> hang-ups.
>
> -Josh
> --- "Duffey, Kevin" <[EMAIL PROTECTED]> wrote:
> > I am interested in your two fixes. Have you (or
> > anyone) noticed that Orion
> > actually requires 175MB of RAM? Is there a
> > definite need to use both memory
> > switches, or perhaps one over the other? What
> > is the use and/or meaning of
> > each switch? What I find funny is I just
> > installed JDK 1.3.1 and noticed the
> > /server, /classic and /hotspot dirs under bin
> > which contain the jvm.dll that
> > Windows uses. I was actually going to post an
> > email to this and JSP interest
> > list asking what the benefits and differences
> > are between the 3 jvms. I
> > haven't been able to find anything on the sun
> > site that details how they are
> > different. Can you fill me in if you know, what
> > makes the server jvm better?
> > Is it better overall for all use (other than
> > client-side SWING apps)? I
> > thought the hotspot was the best because of the
> > inline JIT that converts
> > code to native..and thus should speed it up
> > greatly. Is the server better
> > just for production use, or for anyone running
> > Orion locally for web
> > development as well? Ideally, I would think we
> > want our development, qa,
> > staging and live servers to all run the same
> > JVM to make sure we all see any
> > problems that arise.
> >
> > Thanks.
> >
> >
> > > -----Original Message-----
> > > From: Robert S. Sfeir
> > [mailto:[EMAIL PROTECTED]]
> > > Sent: Wednesday, July 25, 2001 10:51 AM
> > > To: Orion-Interest
> > > Subject: Orion Performance Tuning
> > >
> > >
> > > Hello all,
> > >
> > > I've gone through and read most of the
> > information posted
> > > from this list
> > > about improving the performance of Orion, and
> > increasing the
> > > number of
> > > threads Orion uses to improve its overall
> > performance under load.
> > >
> > > What I've been able to do so far, and it's
> > helped a lot, is:
> > > 1- Added the -Xms and -Xmx switches to make
> > sure Orion starts
> > > and uses more
> > > memory, they're set at 100MB and 300MB
> > respectively, and
> > > Orion uses 175MB
> > > as soon as I start it up, and doesn't seem to
> > grow past 177MB
> > > as the day
> > > goes one and it gets used.
> > >
> > > 2- I added the -server switch in front of the
> > java command so
> > > we make sure
> > > we use the Server version of the HotSpot VM.
> > (Boy does this
> > > thing pick up
> > > speed when using the -server switch!)
> > >
> > > Is there anything else that can be done,
> > short of clustering,
> > > to further
> > > increase Orion's performance?
> > >
> > > My main objective is to make sure we don't
> > get any more weird
> > > hangs and
> > > long wait times in Orion for no apparent
> > reason. Perhaps
> > > increasing the
> > > number of threads Orion uses? I can't seem
> > to find any
> > > definite answer on
> > > that.
> > >
> > > Our servlet seems to be fine, but sometimes
> > when clicking
> > > through a test
> > > web site, one url request seemed to just sit
> > there and hang,
> > > as if Orion
> > > was dead, but I could click and request a
> > different URL and
> > > get immediate
> > > response. So I assumed it was threads in
> > Orion which were not being
> > > managed properly.
> > >
> > > After making reading the posts to the list
> > and making the the
> > > 2 changes
> > > above, the problem seemed to have gone away
> > for the most
> > > part, except it
> > > still happens from time to time in Netscape,
> > IE doesn't seem
> > > to have this
> > > problem. I can quit Netscape and go back in
> > and the problem
> > > is gone for a
> > > while. There is no specific time frame for
> > it to happen. It
> > > does happen
> > > consistently when I click, then stop for
> > about 30-60 seconds,
> > > then click
> > > again or reload, and it just sits there and
> > waits for the
> > > world to come to
> > > an end of something. Very bizarre.
> > >
> > > Any ideas you may have would be of great
> > help.
> > >
> > > Thanks
> > > R
> > >
> > >
> > > Robert S. Sfeir
> > > Director of Software Development
> > > PERCEPTICON corporation,
> > > in Joint Venture With JTransit
> > > San Francisco, CA 94123
> > > pw - http://www.percepticon.com/
> > > jw - http://jtransit.com
> > > e- [EMAIL PROTECTED]
> > >
> >
>
>
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