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List:       openjdk-hotspot-runtime-dev
Subject:    JIT threshold, priority queue
From:       Peter.Kessler () Sun ! COM (Peter B !  Kessler)
Date:       2007-05-27 20:26:47
Message-ID: 4659E987.6030507 () Sun ! COM
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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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