I've not used gcj so I can't speak from experience, but the benchmarks
[1] don't make it look faster. HotSpot is pretty smart, and the Sun
JVM is fairly ridiculously fast. Memory efficient? No, but fast! ;)
Older benchmarks [2] seem to claim otherwise, though they compare to
much older JVM versions too.
Remember that with each release of the JVM all Java code everywhere
gets faster, but your natively compiled gcj code will be stuck at the
same performance it was when gcj ran over it with it's static
optimizations.
Also think about Lua, which is being used by Adobe to power the entire
UI in Lightroom, WoW and Second Life and many other things. And the
JVM completely smokes [3] it.
I'd say to give the Sun JVM a shot and not worry about speed until you
can really show it's too slow.
[1] http://shootout.alioth.debian.org/gp4/benchmark.php?test=all&lang=gcj
[2] http://jmvanel.free.fr/perf/java-cpp.html
[3]
http://shootout.alioth.debian.org/gp4/benchmark.php?test=all&lang=lua&lang2=java
- Elliott
On Jan 15, 2009, at 10:35 PM, Edmund Kohlwey wrote:
Hi,
I'm doing a research project this Spring which is based on some work
that I've done for my job recently. The research project itself
involves visualization of large graphs/networks, and as such has
involved some OpenGL programming. I've already got a large codebase
which is in Java, and I was hoping to reuse it for my research
project. I am, however, concerned about performance of the JVM, and
I've had trouble finding information about the Sun JVM's performance
vs, say, libgcj. Does anyone know anything about the performance of
libgcj (or any other native code java compiler) vs the Sun Java VM?
Perhaps someone could recommend some resources to investigate?
-Ed
