Bastien Montagne
fcbec6e97e
This code allows to push a set of different operations all based on iterations over a range of indices, and then process them all at once over multiple threads. This commit also adds unit tests for both old un-pooled, and new pooled task_parallel_range family of functions, as well as some basic performances tests. This is mainly interesting for relatively low amount of individual tasks, as expected. E.g. performance tests on a 32 threads machine, for a set of 10 different tasks, shows following improvements when using pooled version instead of ten sequential calls to BLI_task_parallel_range(): | Num Items | Sequential | Pooled | Speed-up | | --------- | ---------- | ------- | -------- | | 10K | 365 us | 138 us | 2.5 x | | 100K | 877 us | 530 us | 1.66 x | | 1000K | 5521 us | 4625 us | 1.25 x | Differential Revision: https://developer.blender.org/D6189 Note: Compared to previous commit yesterday, this reworks atomic handling in parallel iter code, and fixes a dummy double-free bug. Now we should only use the two critical values for synchronization from atomic calls results, which is the proper way to do things. Reading a value after an atomic operation does not guarantee you will get the latest value in all cases (especially on Windows release builds it seems).
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