Bunch of microoptimizations #1600
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olefirenque
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| // avoiding extra allocations with a static storage for m_covers | ||
| static xr_vector<std::optional<CCoverPoint>> quadTreeStaticStorage; |
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I'm not sure if this is a good trade-off between allocs/RSS. It would be nice to hear an opinion on this
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It's not recommended to use global/static objects which allocate memory dynamically.
| if (!actual()) | ||
| prepare(); | ||
| { | ||
| static std::mutex prepareMutex; | ||
| std::lock_guard lock(prepareMutex); | ||
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| // Double-checked locking | ||
| if (!actual()) | ||
| prepare(); | ||
| } |
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I believe it was only non-concurrent part for xr_parallel_for in CSpaceRestrictionShape::fill_shape. Since it is called only once for a sequence of CSpaceRestrictor::inside calls, maybe it would be better to extract this to reduce contention
| xr_vector<bool> m_temp; | ||
| // vector<bool> is not applicable for `m_temp` | ||
| // since it is filled in parallel_for (https://timsong-cpp.github.io/cppwp/container.requirements.dataraces). | ||
| xr_vector<int> m_temp; |
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I suppose it wasn't thread-safe before
| if (m_temp[i] && critical_cover(i)) | ||
| m_covers->insert(xr_new<CCoverPoint>(ai().level_graph().vertex_position(ai().level_graph().vertex(i)), i)); | ||
| for (auto &p : quadTreeStaticStorage) | ||
| if (p.has_value()) |
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It seemed that accessing m_temp and calling critical_cover took some time here
for (u32 i = 0; i < levelVertexCount; ++i)
if (m_temp[i] && critical_cover(i))
m_covers->insert(xr_new<CCoverPoint>(ai().level_graph().vertex_position(ai().level_graph().vertex(i)), i));
olefirenque
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| { | ||
| if (inside(graph.vertex_id(&vertex), true) && | ||
| !inside(graph.vertex_id(&vertex), false)) | ||
| m_border_chunk.push_back(graph.vertex_id(&vertex)); | ||
| } | ||
| std::lock_guard lock(mergeMutex); | ||
| if (m_border.capacity() < m_border.size() + m_border_chunk.size()) | ||
| m_border.reserve(m_border.size() + m_border_chunk.size()); | ||
| for (auto x : m_border_chunk) | ||
| m_border.push_back(x); |
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I did a little research on this, and it seemed to me that the body of CBorderMergePredicate::operator(...) is a bigger problem than merging a certain number of chunks under lock
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Ok, it might be irrelevant since I accidentally used UI Freeze option.
I'm sorry for the misinformation. Apparently, this flame graph represents only those samples that were sampled when the NPC's spawning was lagging.
The UI Freeze event indicates time intervals where the application was unable to respond to user input. More specifically, these are time intervals where window messages were not pumped for more than 200 ms or processing of a particular message took more than 200 ms.
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@olefirenque, what profiler did you use?
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To me this strongly looks like tracy but I might be wrong there
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Xottab-DUTY
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@olefirenque, hi! Sorry for a big delay in review & merging! |
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