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cmd/compile: feedback-guided optimization #28262

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josharian opened this Issue Oct 17, 2018 · 0 comments

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josharian commented Oct 17, 2018

This is an umbrella issue for supporting feedback-guided optimization. This has been discussed offhand in a few other contexts (inlining decisions: #17566, code layout decisions: #20356, language changes: #24204, stack growth: #18138).

It is not clear what the design for FGO/PGO support might look like. In particular, what do the feedback/profile files look like?

@aclements observed during conversation at GopherCon 2018 that in order to preserve reproducible builds and efficiency, the feedback file needs to be hashed by cmd/go along with all other inputs, which suggests that it ought to be committed to version control.

cc @randall77 @ianlancetaylor @aclements @crawshaw @bradfitz @CAFxX (and the list could go on, but I'm sure everyone will find it)

@josharian josharian added this to the Unplanned milestone Oct 17, 2018

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