WIP: BLI: reduce idle threads when computing caches #111686

Jacques Lucke · 2023-08-30T11:28:17+02:00

Jacques Lucke commented

2023-08-30 11:28:17 +02:00

Currently, when multiple threads wait for the same cache (e.g. for the normals of a mesh), all except one are idle until the cache has been computed. If the cache computation takes a while, it can be beneficial if the waiting threads do some other work instead. With some luck, they might actually join the computation of the cache. Unfortunately, I couldn't find a way to force the waiting threads to join the cache computation. Instead, they are allowed to steal whatever work they want from other threads. This can be a problem if the stolen work takes a long time and is completely unrelated.

TODO:

Improve docs.
Actually use the functionality by passing the new is_expensive parameter.
Show that this improves performance.

Currently, when multiple threads wait for the same cache (e.g. for the normals of a mesh), all except one are idle until the cache has been computed. If the cache computation takes a while, it can be beneficial if the waiting threads do some other work instead. With some luck, they might actually join the computation of the cache. Unfortunately, I couldn't find a way to force the waiting threads to join the cache computation. Instead, they are allowed to steal whatever work they want from other threads. This can be a problem if the stolen work takes a long time and is completely unrelated. TODO: * Improve docs. * Actually use the functionality by passing the new `is_expensive` parameter. * Show that this improves performance.

Jacques Lucke added 1 commit 2023-08-30 11:28:26 +02:00

ff1126901e initial commit

Jacques Lucke added 2 commits 2023-08-31 13:55:02 +02:00

61fccf17ba Merge branch 'main' into reduce-idle-threads-when-computing-caches

726eb00ae1 fix

Jacques Lucke referenced this pull request

2024-02-12 21:14:13 +01:00

WIP: BLI: allow thread to join cache computation instead of blocking #118158

This pull request is marked as a work in progress.

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