[PATCH] D36607: [Support/Parallel] - Do not spawn thread for single/last task.

[Rui Ueyama via Phabricator via llvm-commits]

ruiu added a comment.

I still wonder if a communication between threads can make something that slow. Where is the exact location where you observe the slowdown? Until we understand the exact reason, we cannot exclude the possibility that this change is hiding a real issue.


https://reviews.llvm.org/D36607