CTools:MilepostGCC:Usage

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MILEPOST 1.5 GCC 4.4.0:

• MILEPOST GCC / cTuning web-services test:

  milepost-gcc --ct-test *.c

You can also use test script ./__test_milepost_gcc

• Using optimization cases directly from the Collective Optimization Database (referenced by unique ID) - it is useful for multi-objective optimization, to share optimization cases within the community or when publishing papers and results on program optimization:

  milepost-gcc --ct-opt=11475790782770590 *.c

You can also use demo script ./__compile_using_milepost_gcc_with_fixed_optimization to understand how to configure your own system.

• Predict good optimizations (execution time, code size, compilation time) based on correlation of program features and optimizations using collective optimization knowledge (empirical iterative feedback-directed compilation performed by multiple users and shared in the Collective Optimization Database):

  milepost-gcc -Oml *.c

You can also use demo script ./__compile_using_milepost_gcc_with_prediction_optimization to understand how to configure your own system.

Real usage cases:

• Nikhil Kapur is trying to use MILEPOST GCC to optimize Mozilla code. More info is available at his blog.

• Yuriy Kashikov has been using MILEPOST GCC to optimize BerkeleyDB and reported speedups of 1.4 times in comparison with native GCC 4.4.0 (-O3) on several Intel Xeon machines without loosing much compilation time or code size.

• Grigori Fursin used MILEPOST GCC to optimize several audio/video libraries for ARC for execution time and code size constraints.