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, 9 insertions, 1 deletions

diff --git a/intern/cycles/render/tables.cpp b/intern/cycles/render/tables.cpp
index 270e05abe29..b581537c852 100644
--- a/intern/cycles/render/tables.cpp
+++ b/intern/cycles/render/tables.cpp
@@ -17,8 +17,10 @@
 #include "render/tables.h"
 #include "device/device.h"
 #include "render/scene.h"
+#include "render/stats.h"
 
 #include "util/util_logging.h"
+#include "util/util_time.h"
 
 CCL_NAMESPACE_BEGIN
 
@@ -34,11 +36,17 @@ LookupTables::~LookupTables()
   assert(lookup_tables.size() == 0);
 }
 
-void LookupTables::device_update(Device *, DeviceScene *dscene)
+void LookupTables::device_update(Device *, DeviceScene *dscene, Scene *scene)
 {
   if (!need_update)
     return;
 
+  scoped_callback_timer timer([scene](double time) {
+    if (scene->update_stats) {
+      scene->update_stats->tables.times.add_entry({"device_update", time});
+    }
+  });
+
   VLOG(1) << "Total " << lookup_tables.size() << " lookup tables.";
 
   if (lookup_tables.size() > 0)