how to speed up java program

[yan lu]

Hi,
I have some java programs to process larger amount of data and also involve some calculations. Because java class file uses java VM, it seems a lot slower then C/C++ program.
Anybody can tell me how to compile java source file into the machine code straightly rather than a class file.
Thanks
-Yan

[Shardool Karnik]

haha that beats the purpose ...
use Just in Time Compilers ...
or the new J# (Microsoft Rules!)
- DooL

[Guennadiy VANIN]

Yan,
Look in http://www.javaperformancetuning.com
and particularly http://www.javaperformancetuning.com/tips.shtml
Then there are many tools permitting to translate anylanguage to a model specification and back to a various languages
Nothing cheap
For ex., http://www.rationalrose.com/
[This message has been edited by G Vanin (edited October 30, 2001).]

[Shaun Larkin]

I'm reading the performance tweeking by Oreilly. It says that compiling to native code will probably "decrease" the speed of most Java programs. The JIT compilers, Hotspot, are optimized to take care of alot of situations.