JIT threshold, priority queue

Nima Gougol nima.gougol at gmail.com
Sun May 27 18:33:08 PDT 2007

Thanks Peter for your directions and suggestions. I hope compiler folks get
back to me pretty soon.  I already have some ideas to adjust compilation
time. My main question is , for now , how to collect statistics and compare
performances of different approaches? By the way, I am using IBM Ashes
benchmarks on Solaris x86. I wish I had SPECs benchmarks but they are a
little expensive. Which benchmarking applications and methods would you guys


Nima R. Gougol

On 5/27/07, Peter B. Kessler <Peter.Kessler at sun.com> wrote:
> 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.
>                         ... peter
> 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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