fix(transpose): correct host allocation and GB/s calculation (#860)

projects/rocprofiler-systems/examples/transpose/transpose.cpp

@@ -116,10 +116,12 @@ run(int rank, int tid, hipStream_t stream, int argc, char** argv)
     std::default_random_engine _engine{ std::random_device{}() * (rank + 1) * (tid + 1) };
     std::uniform_int_distribution<int> _dist{ 0, 1000 };
 
-    size_t size       = sizeof(int) * M * N;
-    int*   inp_matrix = new int[size];
-    int*   out_matrix = new int[size];
-    for(size_t i = 0; i < M * N; i++)
+    const size_t elems      = static_cast<size_t>(M) * static_cast<size_t>(N);
+    const size_t size       = elems * sizeof(int);
+    int*         inp_matrix = new int[elems];
+    int*         out_matrix = new int[elems];
+
+    for(size_t i = 0; i < elems; i++)
     {
         inp_matrix[i] = _dist(_engine);
         out_matrix[i] = 0;
@@ -149,7 +151,7 @@ run(int rank, int tid, hipStream_t stream, int argc, char** argv)
     HIP_API_CALL(hipMemcpyAsync(out_matrix, out, size, hipMemcpyDeviceToHost, stream));
     double time =
         std::chrono::duration_cast<std::chrono::duration<double>>(t2 - t1).count();
-    float GB = (float) size * nitr * 2 / (1 << 30);
+    float GB = static_cast<float>(size) * nitr * 2 / (1 << 30);
 
     print_lock.lock();
     std::cout << "[" << rank << "][" << tid << "] Runtime of transpose is " << time