Rob,
I had already read 2D graphic white paper and experimented with the various
environment variables and property settings.
Here's the vital of the application and environment.
OS: Redhat Enterprise 3
Metcity X server (I believe)
Java 5.0 update 4 (Java 1.5.0_04)
The application runs on a local X server.
According to the white paper, the DGA environment variables (NO__at_J2D_DGA and
USE_DGA_PIXMAPS) apply only to Solaris. Since the execution environment is
Linux only, I haven't experimented with those.
I have previously tried the J2D_PIXMAPS=shared variable but with no noticable
change in performance.
Cheers,
David
--- Rob Ratcliff <rrr6399_at_futuretek.com> wrote:
> Hi David,
>
> Have you tried using "java -Dsun.java2d.pmoffscreen=false"?
>
> You can also try some of these:
> setenv NO_J2D_DGA 1
> setenv USE_DGA_PIXMAPS
> setenv J2D_PIXMAPS shared
> See http://java.sun.com/products/java-media/2D/perf_graphics.html
> for more details.
>
> Also get rid of all semi-transparent colors. They don't work
> well over remote X connections.
>
> Are you using the
> com.bbn.openmap.layer.policy.BufferedImageRenderPolicy
> for your layers that do lots of line drawings?
>
> You are using at least JDK 1.4 right? Anything before that is worthless
> remote
> X connections. JDK 1.5 has lots of nice rendering improvements and many
> more knobs to twiddle.
>
> > -----Original Message-----
> > From: owner-openmap-users_at_bbn.com [mailto:owner-openmap-users_at_bbn.com]On
> > Behalf Of David Ward
> > Sent: Wednesday, August 03, 2005 9:06 PM
> > To: openmap-users_at_bbn.com
> > Subject: [OpenMap Users] Poor Mapbean performance on Linux/Xwindows
> > (revisited)
> >
> >
> >
> > This is a topic I've seen here before, but can find the postings.
> >
> > On Linux/Xwindows my application suffers from poor performance. (Linux is a
> > customer requirement).
> >
> > The majority of the processing is being done by the Xserver with X ometimes
> > reaching 80-90% CPU.
> >
> > My application has 15 layers. 3 are very active layers that obtain data
> from a
> > server. 4 layer are associated with input and drawing. The remaining 8
> layers
> > provide the underlying map and geographic features. These eight layers I
> > recently placed in a BufferedLayer and witness an additional performance
> > increase.
> >
> > The active layers hold and render as many as 60,000-70,000 graphics. The
> > graphics rendering doesn;t seem to be as much of an impact as bliting the
> > buffer to the sever screen.
> >
> > I've researched the issue and discovered a JVM problem with text
> antialiasing
> > and alpha blending when running on Xwindows. I disabled the antialiasing
> as
> > much transperent rendering as I could. This resulted in a marked increase
> in
> > performance.
> >
> > However, I am still seeing poor performance.
> >
> > Does anyone have any tips or techniques to address the Xwindows rendering
> > issue.
> >
> > Cheers,
> > David
> >
> >
> >
> > ----
> > David Ward
> > ROLANDS & ASSOCIATES Corporation
> > 500 Sloat Avenue
> > Monterey, CA 93940
> > USA
> > Tel: 1.831.373.2025
> > Fax: 1.831.373.2841
> > Email: synriga_at_yahoo.com
> >
>
>
----
David Ward
ROLANDS & ASSOCIATES Corporation
500 Sloat Avenue
Monterey, CA 93940
USA
Tel: 1.831.373.2025
Fax: 1.831.373.2841
Email: synriga_at_yahoo.com
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Received on Thu Aug 04 2005 - 06:34:26 EDT