TaskCollaboration improvements #5489
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Although this is contrived, it demonstrates an important point : hashes can alias on the _same_ plug, just in different contexts.
This gives a 3x speedup in `CollectScenesTest.testSetPerformance`. Perhaps more interestingly, it also gives almost a 2x speedup in `SetQueryTest.testScaling()`, but almost half of that speedup is due to the change in hash cache policy _alone_. In `testScaling()`, the same set is required by every location in the scene, but we are visiting enough locations that the hash cache is under significant pressure. By moving `out.set` to the TaskCollaboration policy, the set hash is stored in the shared central cache, from which it is exceedingly unlikely to be evicted (because per-location hashes are not stored in the global cache).
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Closing in favour of #5493. |
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This PR supercedes #4979, fixing the deadlock documented in #4978. I still have a fair bit of testing and tidying I want to do before its merged - I'm making a PR at this stage just so I can get the resulting automated builds deployed at Cinesite for testing. Feel free to take a look and comment if you want, but I'm not expecting a review at this stage.