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stream.cu
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stream.cu
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/*
STREAM benchmark implementation in CUDA.
COPY: a(i) = b(i)
SCALE: a(i) = q*b(i)
SUM: a(i) = b(i) + c(i)
TRIAD: a(i) = b(i) + q*c(i)
It measures the memory system on the device.
The implementation is in double precision.
Code based on the code developed by John D. McCalpin
http://www.cs.virginia.edu/stream/FTP/Code/stream.c
Written by: Massimiliano Fatica, NVIDIA Corporation
Further modifications by: Ben Cumming, CSCS; Andreas Herten (JSC/FZJ)
*/
#define NTIMES 20
#include <string>
#include <vector>
#include <stdio.h>
#include <float.h>
#include <limits.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/time.h>
# ifndef MIN
# define MIN(x,y) ((x)<(y)?(x):(y))
# endif
# ifndef MAX
# define MAX(x,y) ((x)>(y)?(x):(y))
# endif
typedef double real;
static double avgtime[4] = {0}, maxtime[4] = {0},
mintime[4] = {FLT_MAX,FLT_MAX,FLT_MAX,FLT_MAX};
void print_help()
{
printf(
"Usage: stream [-s] [-n <elements>] [-b <blocksize>]\n\n"
" -s\n"
" Print results in SI units (by default IEC units are used)\n\n"
" -n <elements>\n"
" Put <elements> values in the arrays\n"
" (defaults to 1<<26)\n\n"
" -b <blocksize>\n"
" Use <blocksize> as the number of threads in each block\n"
" (defaults to 192)\n"
);
}
void parse_options(int argc, char** argv, bool& SI, int& N, int& blockSize)
{
// Default values
SI = false;
N = 1<<26;
blockSize = 192;
int c;
while ((c = getopt (argc, argv, "sn:b:h")) != -1)
switch (c)
{
case 's':
SI = true;
break;
case 'n':
N = std::atoi(optarg);
break;
case 'b':
blockSize = std::atoi(optarg);
break;
case 'h':
print_help();
std::exit(0);
break;
default:
print_help();
std::exit(1);
}
}
/* A gettimeofday routine to give access to the wall
clock timer on most UNIX-like systems. */
double mysecond()
{
struct timeval tp;
struct timezone tzp;
int i = gettimeofday(&tp,&tzp);
return ( (double) tp.tv_sec + (double) tp.tv_usec * 1.e-6 );
}
template <typename T>
__global__ void set_array(T * __restrict__ const a, T value, int len)
{
int idx = threadIdx.x + blockIdx.x * blockDim.x;
if (idx < len)
a[idx] = value;
}
template <typename T>
__global__ void STREAM_Copy(T const * __restrict__ const a, T * __restrict__ const b, int len)
{
int idx = threadIdx.x + blockIdx.x * blockDim.x;
if (idx < len)
b[idx] = a[idx];
}
template <typename T>
__global__ void STREAM_Scale(T const * __restrict__ const a, T * __restrict__ const b, T scale, int len)
{
int idx = threadIdx.x + blockIdx.x * blockDim.x;
if (idx < len)
b[idx] = scale * a[idx];
}
template <typename T>
__global__ void STREAM_Add(T const * __restrict__ const a, T const * __restrict__ const b, T * __restrict__ const c, int len)
{
int idx = threadIdx.x + blockIdx.x * blockDim.x;
if (idx < len)
c[idx] = a[idx] + b[idx];
}
template <typename T>
__global__ void STREAM_Triad(T const * __restrict__ a, T const * __restrict__ b, T * __restrict__ const c, T scalar, int len)
{
int idx = threadIdx.x + blockIdx.x * blockDim.x;
if (idx < len)
c[idx] = a[idx] + scalar * b[idx];
}
int main(int argc, char** argv)
{
real *d_a, *d_b, *d_c;
int j,k;
double times[4][NTIMES];
real scalar;
std::vector<std::string> label{"Copy: ", "Scale: ", "Add: ", "Triad: "};
// Parse arguments
bool SI;
int N, blockSize;
parse_options(argc, argv, SI, N, blockSize);
printf(" STREAM Benchmark implementation in CUDA\n");
printf(" Array size (%s precision) =%7.2f MB\n", sizeof(double)==sizeof(real)?"double":"single", double(N)*double(sizeof(real))/1.e6);
/* Allocate memory on device */
cudaMalloc((void**)&d_a, sizeof(real)*N);
cudaMalloc((void**)&d_b, sizeof(real)*N);
cudaMalloc((void**)&d_c, sizeof(real)*N);
/* Compute execution configuration */
dim3 dimBlock(blockSize);
dim3 dimGrid(N/dimBlock.x );
if( N % dimBlock.x != 0 ) dimGrid.x+=1;
printf(" using %d threads per block, %d blocks\n",dimBlock.x,dimGrid.x);
if (SI)
printf(" output in SI units (KB = 1000 B)\n");
else
printf(" output in IEC units (KiB = 1024 B)\n");
/* Initialize memory on the device */
set_array<real><<<dimGrid,dimBlock>>>(d_a, 2.f, N);
set_array<real><<<dimGrid,dimBlock>>>(d_b, .5f, N);
set_array<real><<<dimGrid,dimBlock>>>(d_c, .5f, N);
/* --- MAIN LOOP --- repeat test cases NTIMES times --- */
scalar=3.0f;
for (k=0; k<NTIMES; k++)
{
times[0][k]= mysecond();
STREAM_Copy<real><<<dimGrid,dimBlock>>>(d_a, d_c, N);
cudaThreadSynchronize();
times[0][k]= mysecond() - times[0][k];
times[1][k]= mysecond();
STREAM_Scale<real><<<dimGrid,dimBlock>>>(d_b, d_c, scalar, N);
cudaThreadSynchronize();
times[1][k]= mysecond() - times[1][k];
times[2][k]= mysecond();
STREAM_Add<real><<<dimGrid,dimBlock>>>(d_a, d_b, d_c, N);
cudaThreadSynchronize();
times[2][k]= mysecond() - times[2][k];
times[3][k]= mysecond();
STREAM_Triad<real><<<dimGrid,dimBlock>>>(d_b, d_c, d_a, scalar, N);
cudaThreadSynchronize();
times[3][k]= mysecond() - times[3][k];
}
/* --- SUMMARY --- */
for (k=1; k<NTIMES; k++) /* note -- skip first iteration */
{
for (j=0; j<4; j++)
{
avgtime[j] = avgtime[j] + times[j][k];
mintime[j] = MIN(mintime[j], times[j][k]);
maxtime[j] = MAX(maxtime[j], times[j][k]);
}
}
double bytes[4] = {
2 * sizeof(real) * (double)N,
2 * sizeof(real) * (double)N,
3 * sizeof(real) * (double)N,
3 * sizeof(real) * (double)N
};
// Use right units
const double G = SI ? 1.e9 : static_cast<double>(1<<30);
printf("\nFunction Rate %s Avg time(s) Min time(s) Max time(s)\n",
SI ? "(GB/s) " : "(GiB/s)" );
printf("-----------------------------------------------------------------\n");
for (j=0; j<4; j++) {
avgtime[j] = avgtime[j]/(double)(NTIMES-1);
printf("%s%11.4f %11.8f %11.8f %11.8f\n", label[j].c_str(),
bytes[j]/mintime[j] / G,
avgtime[j],
mintime[j],
maxtime[j]);
}
/* Free memory on device */
cudaFree(d_a);
cudaFree(d_b);
cudaFree(d_c);
}