Cycles: Add sample-based runtime profiler that measures time spent in various parts of the CPU kernel

This commit adds a sample-based profiler that runs during CPU rendering and collects statistics on time spent in different parts of the kernel (ray intersection, shader evaluation etc.) as well as time spent per material and object.

The results are currently not exposed in the user interface or per Python yet, to see the stats on the console pass the "--cycles-print-stats" argument to Cycles (e.g. "./blender -- --cycles-print-stats").

Unfortunately, there is no clear way to extend this functionality to CUDA or OpenCL, so it is CPU-only for now.

Reviewers: brecht, sergey, swerner

Reviewed By: brecht, swerner

Differential Revision: https://developer.blender.org/D3892

1 files changed, 40 insertions, 0 deletions

diff --git a/intern/cycles/kernel/kernel_profiling.h b/intern/cycles/kernel/kernel_profiling.h
new file mode 100644
index 00000000000..a46d6376473
--- /dev/null
+++ b/intern/cycles/kernel/kernel_profiling.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2011-2018 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __KERNEL_PROFILING_H__
+#define __KERNEL_PROFILING_H__
+
+#ifdef __KERNEL_CPU__
+#  include "util/util_profiling.h"
+#endif
+
+CCL_NAMESPACE_BEGIN
+
+#ifdef __KERNEL_CPU__
+#  define PROFILING_INIT(kg, event) ProfilingHelper profiling_helper(&kg->profiler, event)
+#  define PROFILING_EVENT(event) profiling_helper.set_event(event)
+#  define PROFILING_SHADER(shader) if((shader) != SHADER_NONE) { profiling_helper.set_shader((shader) & SHADER_MASK); }
+#  define PROFILING_OBJECT(object) if((object) != PRIM_NONE) { profiling_helper.set_object(object); }
+#else
+#  define PROFILING_INIT(kg, event)
+#  define PROFILING_EVENT(event)
+#  define PROFILING_SHADER(shader)
+#  define PROFILING_OBJECT(object)
+#endif  /* __KERNEL_CPU__ */
+
+CCL_NAMESPACE_END
+
+#endif  /* __KERNEL_PROFILING_H__ */