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Kernel optimization with BOLT (binary optimization and layout tool)

(lwn.net)
142 points chmaynard | 4 comments | 31 Oct 24 10:45 UTC | HN request time: 0.642s | source
1. vsskanth ◴[06 Nov 24 17:08 UTC] No.42065443[source]▶
Anyone know of a windows equivalent to BOLT ?
replies(2): >>42069021 #>>42071879 #
2. Cieric ◴[06 Nov 24 20:41 UTC] No.42069021[source]▶
Some google searching brought up this. https://learn.microsoft.com/en-us/cpp/build/profile-guided-o... I'm only reading over it now, but I'm going to test it out a bit when I can.
replies(1): >>42071233 #
3. dwattttt ◴[06 Nov 24 23:32 UTC] No.42071233[source]▶
PGO describes the using extra data to guide optimisations, but it doesn't define what those optimisations are.

Reading the link, there's several that sound like they match what BOLT is applying (Basic Block Optimization, Function Layout, Conditional Branch Optimization, and Dead Code Separation).

4. neerajsi ◴[07 Nov 24 00:39 UTC] No.42071879[source]▶
Microsoft had internal tooling very similar to bolt almost 20 years ago. Most of those opts were moved to the compiler in ltcg mode with pgo.