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, 14 insertions, 0 deletions

diff --git a/intern/cycles/render/camera.cpp b/intern/cycles/render/camera.cpp
index 0fa1d512547..ee68c9ede22 100644
--- a/intern/cycles/render/camera.cpp
+++ b/intern/cycles/render/camera.cpp
@@ -18,6 +18,7 @@
 #include "render/mesh.h"
 #include "render/object.h"
 #include "render/scene.h"
+#include "render/stats.h"
 #include "render/tables.h"
 
 #include "device/device.h"
@@ -27,6 +28,7 @@
 #include "util/util_logging.h"
 #include "util/util_math_cdf.h"
 #include "util/util_task.h"
+#include "util/util_time.h"
 #include "util/util_vector.h"
 
 /* needed for calculating differentials */
@@ -231,6 +233,12 @@ void Camera::update(Scene *scene)
   if (!need_update)
     return;
 
+  scoped_callback_timer timer([scene](double time) {
+    if (scene->update_stats) {
+      scene->update_stats->camera.times.add_entry({"update", time});
+    }
+  });
+
   /* Full viewport to camera border in the viewport. */
   Transform fulltoborder = transform_from_viewplane(viewport_camera_border);
   Transform bordertofull = transform_inverse(fulltoborder);
@@ -466,6 +474,12 @@ void Camera::device_update(Device * /* device */, DeviceScene *dscene, Scene *sc
   if (!need_device_update)
     return;
 
+  scoped_callback_timer timer([scene](double time) {
+    if (scene->update_stats) {
+      scene->update_stats->camera.times.add_entry({"device_update", time});
+    }
+  });
+
   scene->lookup_tables->remove_table(&shutter_table_offset);
   if (kernel_camera.shuttertime != -1.0f) {
     vector<float> shutter_table;