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From cTuning.org

Here is a list of things that you might need to download from this site to enable Collective Optimization:

• CCC framework including milepost-gcc wrapper to extract program features, query database and predict good optimizations (beta version). We strongly advice you to use cDatabase when you install CCC framework to be able to use predefined configurations from the community and to use machine learning and collective optimization techniques to predict program optimizations.

• CCC plugins that include different search strategies for direct iterative compilation

• cBench
• cBench dataset should be downloaded with SVN, as described in cBench itself (there are download scripts in CCC under apps/ccc-admin--get-cbench-*)

• MILEPOST GCC with ICI or extensions to MILEPOST GCC available through ICI SVN:
  • Function cloning and program instrumentation
  • Fine grain program tuning

You can learn more about these tools at the cTools page.