diff options
| -rw-r--r-- | source/blender/blenlib/BLI_task.hh | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/source/blender/blenlib/BLI_task.hh b/source/blender/blenlib/BLI_task.hh index da7309837c8..84d5cd39bb4 100644 --- a/source/blender/blenlib/BLI_task.hh +++ b/source/blender/blenlib/BLI_task.hh @@ -67,14 +67,19 @@ void parallel_for(IndexRange range, int64_t grain_size, const Function &function return; } #ifdef WITH_TBB - tbb::parallel_for(tbb::blocked_range<int64_t>(range.first(), range.one_after_last(), grain_size), - [&](const tbb::blocked_range<int64_t> &subrange) { - function(IndexRange(subrange.begin(), subrange.size())); - }); + /* Invoking tbb for small workloads has a large overhead. */ + if (range.size() >= grain_size) { + tbb::parallel_for( + tbb::blocked_range<int64_t>(range.first(), range.one_after_last(), grain_size), + [&](const tbb::blocked_range<int64_t> &subrange) { + function(IndexRange(subrange.begin(), subrange.size())); + }); + return; + } #else UNUSED_VARS(grain_size); - function(range); #endif + function(range); } template<typename Value, typename Function, typename Reduction> |