Francis Kung wrote: > Hi Christian, Roman, > >> How can I run the benchmarks? I'd like to run it with CACAO. > >>From your classpath directory (/usr/local/classpath/share/classpath by > default) you can invoke it using "cacao > gnu.classpath.examples.java2d.J2dBenchmarkGUI" > >> Yeah sure, most of the work is done in native code, so it doesn't really >> matter if the VM is an interpreter, completely compiled or jit. > > I was talking to fitzsim yesterday, and we also figured that it was > down to Cairo. I spent a bit of time trying to install cairo with > glitz, to see what the improvement would be, but had no luck. I talked with Carl Worth about this yesterday. To test this, we'd need a Graphics that could draw to a GL surface, and we'd need to build Cairo and glitz from source. A "GLGraphics" may be something we need in the future, but for now the released versions of Cairo do not have glitz support and won't until glitz commits to a stable API, which hasn't happened yet. Even so, I think our graphics backend should be much faster without us needing to draw directly to a GL surface. It may be worthwhile to write a Cairo benchmark that performs the same operations as J2dBenchmark to see how far off our Java implementation is from the theoretical best native implementation. Such a benchmark would also allow us to test fastpath optimizations easily. We'd need a set of benchmarks for each of the Cairo surfaces we draw to. Tom
