Refine benchmark output.

Change output measurement from time to bandwidth, so we can compare
all benchmark results easily. And change return type of benchmark
from int to double, because int is not precise enough.

v2: Change output measurement from time to bandwidth.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/benchmark/benchmark_use_host_ptr_buffer.cpp b/benchmark/benchmark_use_host_ptr_buffer.cpp
index 80b6c5c3..9e3d1551 100644
--- a/benchmark/benchmark_use_host_ptr_buffer.cpp
+++ b/benchmark/benchmark_use_host_ptr_buffer.cpp
@@ -1,7 +1,7 @@
 #include "utests/utest_helper.hpp"
 #include <sys/time.h>
 
-int benchmark_use_host_ptr_buffer(void)
+double benchmark_use_host_ptr_buffer(void)
 {
   struct timeval start,stop;
 
@@ -32,7 +32,9 @@ int benchmark_use_host_ptr_buffer(void)
   free(buf_data[0]);
   buf_data[0] = NULL;
 
-  return time_subtract(&stop, &start, 0);
+  double elapsed = time_subtract(&stop, &start, 0);
+
+  return BANDWIDTH(n*sizeof(uint32_t)*100*2, elapsed);
 }
 
 MAKE_BENCHMARK_FROM_FUNCTION(benchmark_use_host_ptr_buffer);