Add benchmark of clEnqueueCopyImageToBuffer(copy 2d image to buffer).

v2:
Change test image size from (width, height) = (960, 540)
to (960 * 4, 540 * 4), becaue larger workload get more stable
benchmark result.

Signed-off-by: Chuanbo Weng <chuanbo.weng@intel.com>
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>

2 files changed, 66 insertions, 1 deletions

diff --git a/benchmark/CMakeLists.txt b/benchmark/CMakeLists.txt
index 73dbe853..7bd61ee1 100644
--- a/benchmark/CMakeLists.txt
+++ b/benchmark/CMakeLists.txt
@@ -14,7 +14,8 @@ set (benchmark_sources
   benchmark_copy_buf.cpp
   benchmark_use_host_ptr_buffer.cpp
   benchmark_read_buffer.cpp
-  benchmark_read_image.cpp)
+  benchmark_read_image.cpp
+  benchmark_copy_image_to_buffer.cpp)
 
 
 SET(CMAKE_CXX_FLAGS "-DBUILD_BENCHMARK ${CMAKE_CXX_FLAGS}")
diff --git a/benchmark/benchmark_copy_image_to_buffer.cpp b/benchmark/benchmark_copy_image_to_buffer.cpp
new file mode 100644
index 00000000..debed093
--- /dev/null
+++ b/benchmark/benchmark_copy_image_to_buffer.cpp
@@ -0,0 +1,64 @@
+#include <string.h>
+#include "utests/utest_helper.hpp"
+#include <sys/time.h>
+
+#define IMAGE_BPP 2
+
+double benchmark_copy_image_to_buffer(void)
+{
+  struct timeval start,stop;
+  const size_t w = 960 * 4;
+  const size_t h = 540 * 4;
+  const size_t sz = IMAGE_BPP * w * h;
+  cl_image_format format;
+  cl_image_desc desc;
+
+  memset(&desc, 0x0, sizeof(cl_image_desc));
+  memset(&format, 0x0, sizeof(cl_image_format));
+
+  // Setup image and buffer
+  buf_data[0] = (unsigned short*) malloc(sz);
+  for (uint32_t i = 0; i < w*h; ++i) {
+    ((unsigned short*)buf_data[0])[i] = (rand() & 0xffff);
+  }
+
+  format.image_channel_order = CL_R;
+  format.image_channel_data_type = CL_UNSIGNED_INT16;
+  desc.image_type = CL_MEM_OBJECT_IMAGE2D;
+  desc.image_width = w;
+  desc.image_height = h;
+  desc.image_row_pitch = desc.image_width * IMAGE_BPP;
+  OCL_CREATE_IMAGE(buf[0], CL_MEM_COPY_HOST_PTR, &format, &desc, buf_data[0]);
+  OCL_CREATE_BUFFER(buf[1], 0, sz, NULL);
+
+  /*copy image to buffer*/
+  size_t origin[3] = {0, 0, 0};
+  size_t region[3] = {w, h, 1};
+
+  OCL_CALL (clEnqueueCopyImageToBuffer, queue, buf[0], buf[1], origin, region,
+            0, 0, NULL, NULL);
+  OCL_FINISH();
+  OCL_MAP_BUFFER(1);
+  /*check result*/
+  for (uint32_t i = 0; i < w*h; ++i) {
+    OCL_ASSERT(((unsigned short *)buf_data[0])[i] == ((unsigned short *)buf_data[1])[i]);
+  }
+  OCL_UNMAP_BUFFER(1);
+  gettimeofday(&start,0);
+
+  for (uint32_t i=0; i<100; i++) {
+    OCL_CALL (clEnqueueCopyImageToBuffer, queue, buf[0], buf[1], origin, region,
+            0, 0, NULL, NULL);
+  }
+  OCL_FINISH();
+
+  gettimeofday(&stop,0);
+  free(buf_data[0]);
+  buf_data[0] = NULL;
+
+  double elapsed = time_subtract(&stop, &start, 0);
+
+  return BANDWIDTH(sz * 100, elapsed);
+}
+
+MAKE_BENCHMARK_FROM_FUNCTION(benchmark_copy_image_to_buffer);