Cycles: add time statistics to scene update

Gathers information for time spent in the various managers or object (Film, Camera, etc.) being updated in Scene::device_update.

The stats include the total time spent in the device_update methods as well as time spent in subroutines (e.g. bvh build, displacement, etc.).

This does not qualify as a full blown profiler, but is useful to identify potential bottleneck areas.

The stats can be enabled and printed by passing `--cycles-print-stats` on the command line to Cycles, or `-- --cycles-print-stats` to Blender.

Reviewed By: brecht

Maniphest Tasks: T79174

Differential Revision: https://developer.blender.org/D8596

1 files changed, 6 insertions, 0 deletions

diff --git a/intern/cycles/render/scene.h b/intern/cycles/render/scene.h
index 0e32a70952b..cc2ef8da589 100644
--- a/intern/cycles/render/scene.h
+++ b/intern/cycles/render/scene.h
@@ -59,6 +59,7 @@ class Progress;
 class BakeManager;
 class BakeData;
 class RenderStats;
+class SceneUpdateStats;
 class Volume;
 
 /* Scene Device Data */
@@ -260,6 +261,9 @@ class Scene : public NodeOwner {
   /* mutex must be locked manually by callers */
   thread_mutex mutex;
 
+  /* scene update statistics */
+  SceneUpdateStats *update_stats;
+
   Scene(const SceneParams &params, Device *device);
   ~Scene();
 
@@ -280,6 +284,8 @@ class Scene : public NodeOwner {
 
   void collect_statistics(RenderStats *stats);
 
+  void enable_update_stats();
+
   bool update(Progress &progress, bool &kernel_switch_needed);
 
   /* This function is used to create a node of a specified type instead of