JIT threshold, priority queue
Peter B. Kessler
Peter.Kessler at Sun.COM
Sun May 27 13:26:47 PDT 2007
This question is about the HotSpot runtime compilers, not about
the HotSpot runtime libraries. I've cc'd
hotspot-compiler-dev at openjdk.java.net
who should be able to help you. I don't know much about the
runtime compilation policy, but I do know that the compiler
folks wish they could _delay_ compilation, so they get better
statistics about the code they are compiling.
Nima Gougol wrote:
> Hello everybody. Here I am trying to optimize Hotspot JDK 7. You guys
> know hotspot schedule hot methods whose usage frequency is higher than a
> fixed threshold through a FIFO queue for Just-In-Time compilation. I am
> trying to enhance this method with dynamic threshold and priority
> queues. I have already done some modifications. I have two problems.
> First, I need to trace the queue of methods that are scheduled for JIT
> compilations and see and compare my new policy with the default. How can
> I trace and log methods that are queue for JIT compilation?
> Second, I am trying to add to constants in through the file,
> src/share/vm/opto/c2_globals.hpp in order to use in my implementations
> for instance in file src/share/vm/oops/methodOop.hpp. But while making
> the hotpsot, compiler produce error that these identifiers are not
> defined. I think this is due to my way of building. Please let me know
> how I should add these identifiers and build hotspot.
> product(intx, CICompilerQueueType, 1, \
> "Compiler Queue Algorithm to
> use") \
> product(intx, PairQueueLength,
> 10, \
> "Max Length of Pair
> Queue") \
> Best Regards,
> Nima R. Gougol
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