[PATCH] D71970: [profile] Support merge pool size >= 10

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

In D71970#1806455 <https://reviews.llvm.org/D71970#1806455>, @vsk wrote:

> What kind of performance improvement were you able to measure for your workload with n >= 10? What was the impact on profile size?


It has been a while since I measured the difference. If I use `LLVM_PROFILE_FILE=...%4m` for llc and `LLVM_PROFILE_FILE=/dev/null` for other tools, `%4m` vs `%9m` has significant performance improvement testing `test/CodeGen/X86`, maybe 30% (I may misremember the number) or something. `%9m` vs `%20m` has insignificant difference. If my machine has more cores or if I choose a better benchmark, I may see a difference :)


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