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From Steve Blackburn <Steve.Blackb...@anu.edu.au>
Subject Re: Sending native code to the processor at runtime
Date Sat, 14 May 2005 22:10:35 GMT

>Why can a JIT not achieve 110% of native performance? (Assuming that we
>strip out the compile time and compare like with like.)
>The reason I say 110% is that binary code is usually compiled for the
>lowest common denominator. So x86 code targets a 386, and Sparc binaries
>target UltraSparc v8 or older processors. 
>The advantage a JIT has is that it knows exactly where it is being
>compiled, so in theory can make use of as much hardware assistance as it

Just taking up this point, the answer is yes.   This is a very hot 
subject in the research community right now.  Dynamic optimization can 
improve micro-architectural performance in ways that are not possible 
with static compilation.  Traditional static optimization is limited by 
factors including dynamically linked libraries, lack of information 
about the runtime microarchitecture, and unpredictable or phasic 
application behavior.

This approach is not limited to JITs for languages like Java, it is also 
being applied to binaries (ie parsing and recompiling machine code).  
There is a whole slew of work out there on this subject.  As we push the 
architectures harder, dynamic optimization becomes more and more important.



Here's a semi-random set of pointers to some recent work. There is a 
stack more work out there, these are just a few that happen to be at my 
finger tips.  Most of it is available online, just google for it.

@inproceedings{ arnold05collecting,
    author = "Matthew Arnold and David Grove",
    title = "{Collecting and Exploiting High-Accuracy Call Graph 
Profiles in Virtual Machines}",
    booktitle = "International Symposium on Code Generation and 
    pages = "51-62",
    year = "2005" }
@MISC{ klaiber00crusoe,
  AUTHOR = {Alexander Klaiber},
  TITLE = "{The Technology Behind Crusoe Processors}",
  HOWPUBLISHED = {White Paper of Transmeta Corporation},
  YEAR = 2000,
  MONTH = {January},
  URL = {http://www.transmeta.com/pdfs/paper_aklaiber_19jan00.pdf},
  CATEGORY = {techdoc,dvs}

 author = {Derek Bruening and Timothy Garnett and Saman Amarasinghe},
 title = {An infrastructure for adaptive dynamic optimization},
 booktitle = {CGO '03: Proceedings of the international symposium on 
Code generation and optimization},
 year = {2003},
 isbn = {0-7695-1913-X},
 pages = {265--275},
 location = {San Francisco, California},
 publisher = {IEEE Computer Society},
 address = {Washington, DC, USA},
 author = {Thomas Kistler and Michael Franz},
 title = {Continuous program optimization: A case study},
 journal = {ACM Trans. Program. Lang. Syst.},
 volume = {25},
 number = {4},
 year = {2003},
 issn = {0164-0925},
 pages = {500--548},
 doi = {http://doi.acm.org/10.1145/778559.778562},
 publisher = {ACM Press},
 address = {New York, NY, USA},
 author = {Jiwei Lu and Howard Chen and Rao Fu and Wei-Chung Hsu and 
Bobbie Othmer and Pen-Chung Yew and Dong-Yuan Chen},
 title = {The Performance of Runtime Data Cache Prefetching in a Dynamic 
Optimization System},
 booktitle = {MICRO 36: Proceedings of the 36th Annual IEEE/ACM 
International Symposium on Microarchitecture},
 year = {2003},
 isbn = {0-7695-2043-X},
 pages = {180},
 publisher = {IEEE Computer Society},
 address = {Washington, DC, USA},
 author = {Matthew C. Merten and Andrew R. Trick and Erik M. Nystrom and 
Ronald D. Barnes and Wen-mei W. Hmu},
 title = {A hardware mechanism for dynamic extraction and relayout of 
program hot spots},
 booktitle = {ISCA '00: Proceedings of the 27th annual international 
symposium on Computer architecture},
 year = {2000},
 isbn = {1-58113-232-8},
 pages = {59--70},
 location = {Vancouver, British Columbia, Canada},
 doi = {http://doi.acm.org/10.1145/339647.339655},
 publisher = {ACM Press},
 address = {New York, NY, USA},
 author = {Roni Rosner and Yoav Almog and Micha Moffie and Naftali 
Schwartz and Avi Mendelson},
 title = {Power Awareness through Selective Dynamically Optimized Traces},
 booktitle = {ISCA '04: Proceedings of the 31st annual international 
symposium on Computer architecture},
 year = {2004},
 isbn = {0-7695-2143-6},
 pages = {162},
 location = {Munchen, Germany},
 publisher = {IEEE Computer Society},
 address = {Washington, DC, USA},
@inproceedings{ arnold00adaptive,
    author = "Matthew Arnold and Stephen J. Fink and David Grove and 
Michael Hind and Peter F. Sweeney",
    title = "{Adaptive Optimization in the Jalape{\~n}o JVM}",
    booktitle = "Conference on Object-Oriented Programming, Systems, 
Languages, and Applications",
    pages = "47--65",
    year = "2000",
    url = "citeseer.nj.nec.com/arnold00adaptive.html" }

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