[PATCH] D85974: [ORC] Add a LLJITWithThinLTOSummaries example in OrcV2Examples

[Stefan Gränitz via Phabricator via llvm-commits]

sgraenitz added a comment.

In D85974#2218405 <https://reviews.llvm.org/D85974#2218405>, @lhames wrote:

> What performance issues did you run in to with threading and performance? I haven't had a chance to look in to that yet.

Performance gains inherently depended on a smart handling of fine-grained async tasks. Otherwise the runtime cost for handling concurrency is easily eating up the gains quickly. I have the impression that the LLVM ThreadPool implementation is too limited here, e.g. there is no mechanism for priority-based scheduling. Trying to walk around the limitations added at lot of complexity that I didn't manage to handle. It might be easier with a decent threading library at hand or maybe a Rust-like async/await. More experiments to come out-of-tree :)


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