Tracing JITs and modern CPUs

Re:Tracing JITs and modern CPUs by loganhough on Friday July 24, 2015 @02:29PM (#9944151)

> The JVM is not a tracing JIT compiler

He didn't claim or imply it was.

> Tracing is a very slow operation.

Wait a second - you were just saying that PE was slow. Now you are saying that tracing is slow instead?

> Hence the warmup problem is substantially worse for tracing JITs.

This is contrary to everything I've seen in the research. Tracing JITs like LuaJIT and PyPY as fast to warm up compared to method JITs and PEs.

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Re:Tracing JITs and modern CPUs by mafribe on Saturday July 25, 2015 @02:41AM (#9946786)

I said, or was trying to say that DPE and tracing have bad warmup.

    Tracing JITs like LuaJIT and PyPY as fast to warm up compared to method JITs and PEs.

I have heard the opposite about PyPy, which is meta-tracing.

I'm a bit uncomfortable with saying "I have heard ..." As far as I'm aware there is no actual published research on this question. But there will soon be, so I would like to withdraw from this debate until I have read that research.

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