underdog-blog

I’m using the TIBCO designer for quite a while now. Before using it in a debian environment I developed all TIBCO related stuff in Windows XP. Now with the switch to linux there came quite a shift in user experience. One thing that really annoyed me was the slow performance of the designer debugger.
So I started some measurements with a simple test process. The test process creates a simple list of all files (2000 items) in one folder and then iterates over every entry. Here is what I got:

Windows XP: 194sec
Windows XP (minimized): 6sec
Gnome: 470sec
Gnome (minimized): 4sec

All this data was gathered with the same default installation of a TIBCO designer 5.6 with the default java runtime. The configs were all left untouched. So now I tried to find something to improve that behavior. I first concentrated on how to influence the jvm.
After a bit of research in the TIBCO direction a found the following value in the tra-file which allows the user to pass parameters directly to the jvm:

java.extended.properties

With that information I tried several parameters suggested by google. After a few tries I came to this one:

sun.java2d.pmoffscreen=false

What Sun says about it isn’t really clear to me but it helps drastically to improve performance. Back to my original test I came up with the following timings:

Gnome (pmoffscreen=false): 75sec
Gnome (pmoffscreen=false): 5sec

As you can see it actually surpasses the Windows installation. That was a result I didn’t actually expect. Till now I found no drawback to this solution.
Just for the sake of completeness here my full config line of the designer.tra

java.extended.properties=-Xrs -Xmx3072M -Xms1536M -XX:+AggressiveOpts -XX:-UseParallelGC -XX:-UseConcMarkSweepGC -XX:MaxPermSize=512M -XX:+UseFastAccessorMethods -Xverify:none -Dsun.java2d.pmoffscreen=false