[Bf-blender-cvs] [5154eb6] cycles_kernel_split: Add utility function to check if given tile size can be rendered by split kernel
varunsundar08
noreply at git.blender.org
Wed Apr 15 17:36:50 CEST 2015
Commit: 5154eb669ddb9860bf4b3b5fbc91cba8758ba604
Author: varunsundar08
Date: Tue Apr 7 15:25:22 2015 +0530
Branches: cycles_kernel_split
https://developer.blender.org/rB5154eb669ddb9860bf4b3b5fbc91cba8758ba604
Add utility function to check if given tile size can be rendered by split kernel
===================================================================
M intern/cycles/device/device_opencl.cpp
===================================================================
diff --git a/intern/cycles/device/device_opencl.cpp b/intern/cycles/device/device_opencl.cpp
index 6f2c609..b785d7e 100644
--- a/intern/cycles/device/device_opencl.cpp
+++ b/intern/cycles/device/device_opencl.cpp
@@ -47,6 +47,10 @@ CCL_NAMESPACE_BEGIN
#define CL_MEM_PTR(p) ((cl_mem)(uintptr_t)(p))
#ifdef __SPLIT_KERNEL__
+
+#define SPLIT_KERNEL_LOCAL_SIZE_X 64
+#define SPLIT_KERNEL_LOCAL_SIZE_Y 1
+
/* This value may be tuned according to the scene we are rendering */
/* modifying PATH_ITER_INC_FACTOR value proportional to number of expected ray-bounces will improve performance */
#define PATH_ITER_INC_FACTOR 8
@@ -2416,7 +2420,7 @@ public:
assert(rayState_size == 1);
size_t global_size[2];
- size_t local_size[2] = { 64, 1 };
+ size_t local_size[2] = { SPLIT_KERNEL_LOCAL_SIZE_X, SPLIT_KERNEL_LOCAL_SIZE_Y };
if(first_tile) {
@@ -3483,6 +3487,161 @@ One possible tile size is %zux%zu \n", tile_max_x - local_size[0] , tile_max_y -
#endif
}
+ /* Calculates the amount of memory that has to be always
+ * allocated in order for the split kernel to function.
+ * This memory is tile/scene-property invariant (meaning,
+ * the value returned by this function does not depend
+ * on the user set tile size or scene properties
+ */
+ size_t get_invariable_mem_allocated() {
+ size_t total_invariable_mem_allocated = 0;
+ size_t KernelGlobals_size = 0;
+ size_t ShaderData_SOA_size = 0;
+
+ /* Find KernelGlobals size */
+ /* Copy dummy KernelGlobals related to OpenCL from kernel_globals.h to fetch its size */
+ typedef struct KernelGlobals {
+ ccl_constant KernelData *data;
+#define KERNEL_TEX(type, ttype, name) \
+ ccl_global type *name;
+#include "kernel_textures.h"
+ } KernelGlobals;
+ KernelGlobals_size = sizeof(KernelGlobals);
+
+ /* Calculate ShaderData_SOA_size */
+ size_t num_shader_soa_ptr = SD_NUM_FLOAT3 + SD_NUM_INT + SD_NUM_FLOAT
+#ifdef __DPDU__
+ + SD_NUM_DPDU_FLOAT3
+#endif
+#ifdef __RAY_DIFFERENTIAL__
+ + SD_NUM_RAY_DIFFERENTIALS_DIFFERENTIAL3
+ + SD_NUM_DIFFERENTIAL
+#endif
+ + SD_NUM_RAY_DP_DIFFERENTIAL3;
+ ShaderData_SOA_size = num_shader_soa_ptr * sizeof(void *);
+
+ total_invariable_mem_allocated += KernelGlobals_size; /* KernelGlobals size */
+ total_invariable_mem_allocated += NUM_QUEUES * sizeof(unsigned int); /* Queue index size */
+ total_invariable_mem_allocated += sizeof(char); /* use_queues_flag size */
+ total_invariable_mem_allocated += ShaderData_SOA_size; /* sd size */
+ total_invariable_mem_allocated += ShaderData_SOA_size; /* sd_dl size */
+ total_invariable_mem_allocated += ShaderData_SOA_size; /* sd_shadow size */
+
+ return total_invariable_mem_allocated;
+ }
+
+ /* Calculate the memory that has-to-be/has-been allocated for the split kernel to function */
+ size_t get_tile_specific_mem_allocated(RenderTile rtile) {
+ size_t tile_specific_mem_allocated = 0;
+
+ /* Get required tile info */
+ cl_int d_w = rtile.w;
+ cl_int d_h = rtile.h;
+ cl_mem d_buffer = CL_MEM_PTR(rtile.buffer);
+ cl_mem d_rng_state = CL_MEM_PTR(rtile.rng_state);
+ unsigned int user_set_tile_w = rtile.tile_size.x;
+ unsigned int user_set_tile_h = rtile.tile_size.y;
+
+#ifdef __WORK_STEALING__
+ /* Calculate memory to be allocated for work_pools in case of work_stealing */
+ size_t max_global_size[2];
+ size_t max_num_work_pools = 0;
+ max_global_size[0] = (((user_set_tile_w - 1) / SPLIT_KERNEL_LOCAL_SIZE_X) + 1) * SPLIT_KERNEL_LOCAL_SIZE_X;
+ max_global_size[1] = (((user_set_tile_h - 1) / SPLIT_KERNEL_LOCAL_SIZE_Y) + 1) * SPLIT_KERNEL_LOCAL_SIZE_Y;
+ max_num_work_pools = (max_global_size[0] * max_global_size[1]) / (SPLIT_KERNEL_LOCAL_SIZE_X * SPLIT_KERNEL_LOCAL_SIZE_Y);
+ tile_specific_mem_allocated += max_num_work_pools * sizeof(unsigned int);
+#endif
+
+ /* Calculate per thread memory output buffer size */
+ size_t output_buffer_size = 0;
+ ciErr = clGetMemObjectInfo(d_buffer, CL_MEM_SIZE, sizeof(output_buffer_size), &output_buffer_size, NULL);
+ assert(ciErr == CL_SUCCESS && "Can't get d_buffer mem object info");
+ /* This value is different when running on AMD and NV */
+ size_t per_pixel_output_buffer_size = output_buffer_size / (d_w * d_h);
+
+ tile_specific_mem_allocated = user_set_tile_w * user_set_tile_h * per_pixel_output_buffer_size;
+ tile_specific_mem_allocated = user_set_tile_w * user_set_tile_h * sizeof(RNG);
+
+ return tile_specific_mem_allocated;
+ }
+
+ /* Calculates the texture memories that has been allocated */
+ size_t get_scene_specific_mem_allocated(cl_mem d_data) {
+ size_t scene_specific_mem_allocated = 0;
+ /* Calculate texture memories */
+#define KERNEL_TEX(type, ttype, name) \
+ scene_specific_mem_allocated += get_tex_size(#name);
+#include "kernel_textures.h"
+
+ return scene_specific_mem_allocated;
+ }
+
+ /* Calculate the memory required for one thread in split kernel */
+ size_t get_per_thread_memory() {
+
+ size_t shader_closure_size = 0;
+ size_t shaderdata_volume = 0;
+#ifdef __MULTI_CLOSURE__
+ shader_closure_size = get_shader_closure_size(clos_max);
+#else
+ shader_closure_size = get_shader_closure_size(MAX_CLOSURE);
+#endif
+ shaderdata_volume = get_shader_data_size(shader_closure_size);
+
+ size_t retval = rng_size + throughput_size + L_transparent_size + rayState_size + work_element_size
+ + ISLamp_size + PathRadiance_size + Ray_size + PathState_size
+ + Intersection_size /* Overall isect */
+ + Intersection_coop_AO_size /* Instersection_coop_AO */
+ + Intersection_coop_DL_size /* Intersection coop DL */
+ + shaderdata_volume /* Overall ShaderData */
+ + shaderdata_volume /* ShaderData_coop_DL */
+ + (shaderdata_volume * 2) /* ShaderData coop shadow */
+ + LightRay_size + BSDFEval_size + AOAlpha_size + AOBSDF_size + AOLightRay_size
+ + (sizeof(int)* NUM_QUEUES)
+ + per_thread_output_buffer_size;
+
+ return retval;
+ }
+
+ /* Considers the total memory available in the device and
+ * and returns the maximum global work size possible
+ */
+ size_t get_feasible_global_work_size(RenderTile rtile, cl_mem d_data) {
+
+ /* Calculate invariably allocated memory */
+ size_t invariable_mem_allocated = get_invariable_mem_allocated();
+ /* Calculate tile specific allocated memory */
+ size_t tile_specific_mem_allocated = get_tile_specific_mem_allocated(rtile);
+ /* Calculate scene specific allocated memory */
+ size_t scene_specific_mem_allocated = get_scene_specific_mem_allocated(d_data);
+
+ /* Calculate total memory available for the threads in global work size */
+ size_t available_memory = total_allocatable_memory
+ - invariable_mem_allocated
+ - tile_specific_mem_allocated
+ - scene_specific_mem_allocated
+ - DATA_ALLOCATION_MEM_FACTOR;
+
+ size_t per_thread_memory_required = get_per_thread_memory();
+
+ return (available_memory / per_thread_memory_required);
+ }
+
+ /* Checks if the device has enough memory to render the whole tile;
+ * If not, we should split single tile into multiple tiles of small size
+ * and process them all
+ */
+ bool need_to_split_tile(unsigned int d_w, unsigned int d_h, unsigned int feasible_global_work_size) {
+ size_t global_size_estimate[2] = {0, 0};
+ global_size_estimate[0] = (((d_w - 1) / SPLIT_KERNEL_LOCAL_SIZE_X) + 1) * SPLIT_KERNEL_LOCAL_SIZE_X;
+ global_size_estimate[1] = (((d_h - 1) / SPLIT_KERNEL_LOCAL_SIZE_Y) + 1) * SPLIT_KERNEL_LOCAL_SIZE_Y;
+ if (global_size_estimate[0] * global_size_estimate[1] > feasible_global_work_size) {
+ return true;
+ } else {
+ return false;
+ }
+ }
+
void thread_run(DeviceTask *task)
{
if(task->type == DeviceTask::FILM_CONVERT) {
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