Itanium: A cautionary tale

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Re. compile for speed

"Dynamic is always slower than pre-compiled. If you need speed, you compile."

Not true. VM code is no longer interpreted - JIT compilers yield native code, its just not done in one full swoop ahead of time. Its usually done method by method as needed, and cached.

There are also reasons that JIT'd code can perform better than traditionally compiled native code:
1) The JIT compiler can optimize for a specific CPU, rather than for the lowest denominator in a CPU family.
2) A JITd VM can adjust for changing branch prediction results
3) Method calls can be both devirtualized and inlined
4) Garbage collection is no longer a penalty for using a VM. Generational gc has improved greatly the time needed to free memory by only sweeping older "generations" of allocated memory.
5) Escape analysis can prevent unneeded allocations

Posted by: techboy_z   Posted on: 12/07/05 You are currently: a Guest | Members login | Terms of Use

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