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warp_reduction.cu
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//assume 32 threads here
//tile sync
#include <cuda_runtime_api.h>
#include <cooperative_groups.h>
#include <stdio.h>
namespace cg = cooperative_groups;
__global__ void reduceBlock_BLOCK(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
// if(tid<32)
// {
sdata[tid]=idata[tid];
sdata[tid+32]=0;
// }
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
// if(tid<32)
// {
sdata[tid]+=sdata[tid+16];cg::sync(block);
sdata[tid]+=sdata[tid+8];cg::sync(block);
sdata[tid]+=sdata[tid+4];cg::sync(block);
sdata[tid]+=sdata[tid+2];cg::sync(block);
sdata[tid]+=sdata[tid+1];cg::sync(block);
// }
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_TILE(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
sdata[tid]+=sdata[tid+16];cg::sync(cg::tiled_partition(block,32));
sdata[tid]+=sdata[tid+8];cg::sync(cg::tiled_partition(block,16));
sdata[tid]+=sdata[tid+4];cg::sync(cg::tiled_partition(block,8));
sdata[tid]+=sdata[tid+2];cg::sync(cg::tiled_partition(block,4));
sdata[tid]+=sdata[tid+1];cg::sync(cg::tiled_partition(block,2));
// sdata[tid]+=sdata[tid+16];cg::sync(cg::tiled_partition<32>(block));
// sdata[tid]+=sdata[tid+8];cg::sync(cg::tiled_partition<16>(block));
// sdata[tid]+=sdata[tid+4];cg::sync(cg::tiled_partition<8>(block));
// sdata[tid]+=sdata[tid+2];cg::sync(cg::tiled_partition<4>(block));
// sdata[tid]+=sdata[tid+1];cg::sync(cg::tiled_partition<2>(block));
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_TILEW(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
sdata[tid]+=sdata[tid+16];cg::sync(tile32);
sdata[tid]+=sdata[tid+8];cg::sync(tile32);
sdata[tid]+=sdata[tid+4];cg::sync(tile32);
sdata[tid]+=sdata[tid+2];cg::sync(tile32);
sdata[tid]+=sdata[tid+1];cg::sync(tile32);
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_SHUFFLE(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
double mySum = sdata[tid];
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
mySum+=tile32.shfl_down(mySum,16);
mySum+=tile32.shfl_down(mySum,8);
mySum+=tile32.shfl_down(mySum,4);
mySum+=tile32.shfl_down(mySum,2);
mySum+=tile32.shfl_down(mySum,1);
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
if(tid==0)
sdata[tid]=mySum;
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_COA(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
if(tid<16){ sdata[tid]+=sdata[tid+16];cg::sync(cg::coalesced_threads());}
if(tid<8){sdata[tid]+=sdata[tid+8];cg::sync(cg::coalesced_threads());}
if(tid<4){sdata[tid]+=sdata[tid+4];cg::sync(cg::coalesced_threads());}
if(tid<2){sdata[tid]+=sdata[tid+2];cg::sync(cg::coalesced_threads());}
if(tid<1){sdata[tid]+=sdata[tid+1];cg::sync(cg::coalesced_threads());}
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_COAW(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
cg::coalesced_group csg = cg::coalesced_threads();
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
sdata[tid]+=sdata[tid+16];cg::sync(csg);
sdata[tid]+=sdata[tid+8];cg::sync(csg);
sdata[tid]+=sdata[tid+4];cg::sync(csg);
sdata[tid]+=sdata[tid+2];cg::sync(csg);
sdata[tid]+=sdata[tid+1];cg::sync(csg);
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_COA_SHUFFLE(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
double mySum = sdata[tid];
cg::coalesced_group csg = cg::coalesced_threads();
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
// if(tid<32){
// mySum+=cg::coalesced_threads().shfl_down(mySum,16);
// }
// if(tid<16){
// mySum+=cg::coalesced_threads().shfl_down(mySum,8);
// }
// if(tid<8){
// mySum+=cg::coalesced_threads().shfl_down(mySum,4);
// }
// if(tid<4){
// mySum+=cg::coalesced_threads().shfl_down(mySum,2);
// }
// if(tid<2){
// mySum+=cg::coalesced_threads().shfl_down(mySum,1);
// }
mySum+=csg.shfl_down(mySum,16);
mySum+=csg.shfl_down(mySum,8);
mySum+=csg.shfl_down(mySum,4);
mySum+=csg.shfl_down(mySum,2);
mySum+=csg.shfl_down(mySum,1);
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
if(tid==0)
sdata[tid]=mySum;
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_NOSYNC(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
sdata[tid]+=sdata[tid+16];
sdata[tid]+=sdata[tid+8];
sdata[tid]+=sdata[tid+4];
sdata[tid]+=sdata[tid+2];
sdata[tid]+=sdata[tid+1];
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_FENCE(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(block);
double __shared__ volatile sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
sdata[tid]+=sdata[tid+16];
sdata[tid]+=sdata[tid+8];
sdata[tid]+=sdata[tid+4];
sdata[tid]+=sdata[tid+2];
sdata[tid]+=sdata[tid+1];
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_SERIAL(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
double mySum=0;// = sdata[tid];
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
// if(tid==0)
// {
mySum+=sdata[0];
mySum+=sdata[1];
mySum+=sdata[2];
mySum+=sdata[3];
mySum+=sdata[4];
mySum+=sdata[5];
mySum+=sdata[6];
mySum+=sdata[7];
mySum+=sdata[8];
mySum+=sdata[9];
mySum+=sdata[10];
mySum+=sdata[11];
mySum+=sdata[12];
mySum+=sdata[13];
mySum+=sdata[14];
mySum+=sdata[15];
mySum+=sdata[16];
mySum+=sdata[17];
mySum+=sdata[18];
mySum+=sdata[19];
mySum+=sdata[20];
mySum+=sdata[21];
mySum+=sdata[22];
mySum+=sdata[23];
mySum+=sdata[24];
mySum+=sdata[25];
mySum+=sdata[26];
mySum+=sdata[27];
mySum+=sdata[28];
mySum+=sdata[29];
mySum+=sdata[30];
mySum+=sdata[31];
sdata[tid]=mySum;
// }
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void reduceBlock_SERIAL_BASIC(double*idata,double*output,unsigned int *time_stamp)
{
cg::thread_block block = cg::this_thread_block();
double __shared__ sdata[64];
unsigned int tid = block.thread_rank();
cg::thread_group tile32 = cg::tiled_partition(block,32);
unsigned int start,stop;
sdata[tid]=idata[tid];
sdata[tid+32]=0;
double mySum=0;// = sdata[tid];
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
// if(tid==0)
// {
mySum+=sdata[1];
sdata[0]=mySum;
// sync(tile32);
// sync(tile32);
// }
asm volatile ("mov.u32 %0, %%clock;" : "=r"(stop) :: "memory");
time_stamp[0]=start;
time_stamp[1]=stop;
if(tid==0)
output[tid]=sdata[tid];
}
__global__ void k_base_kernel (float q, float p, double *out, unsigned int *time_stamp=NULL, unsigned int tile=32){
unsigned int id = threadIdx.x + blockIdx.x * blockDim.x;
cg::thread_group block = cg::this_thread_block();
cg::thread_group tg = cg::tiled_partition(block, tile);
unsigned int start,end;
asm volatile ("mov.u32 %0, %%clock;" : "=r"(start) :: "memory");
cg::sync(tg);
// cg::sync(tg);
asm volatile ("mov.u32 %0, %%clock;" : "=r"(end) :: "memory");
unsigned int warp_id = id/32;
if(id%32==0)
{
if(NULL!=time_stamp){
time_stamp[warp_id*2]=start;
time_stamp[warp_id*2+1]=end;
}
}
out[id]=(double)q;
}
int main()
{
double* h_input = (double*)malloc(sizeof(double)*32);
double* h_output = (double*)malloc(sizeof(double)*20);
unsigned int * h_time_stamp = (unsigned int*)malloc(sizeof(unsigned int)*40);
double* d_input;
double* d_output;
unsigned int* d_time_stamp;
cudaMalloc((void**)&d_input, sizeof(double)*32);
cudaMalloc((void**)&d_output, sizeof(double)*20);
cudaMalloc((void**)&d_time_stamp , sizeof(unsigned int)*40);
for(int i=0; i<32; i++)
{
h_input[i]=i;
}
cudaMemcpy(d_input, h_input, sizeof(double)*32, cudaMemcpyHostToDevice);
reduceBlock_BLOCK<<<1,32>>>(d_input,d_output+8,d_time_stamp+16);
reduceBlock_SERIAL<<<1,32>>>(d_input,d_output+0,d_time_stamp+0);
reduceBlock_NOSYNC<<<1,32>>>(d_input,d_output+1,d_time_stamp+2);
reduceBlock_TILE<<<1,32>>>(d_input,d_output+2,d_time_stamp+4);
reduceBlock_TILEW<<<1,32>>>(d_input,d_output+3,d_time_stamp+6);
reduceBlock_SHUFFLE<<<1,32>>>(d_input,d_output+4,d_time_stamp+8);
reduceBlock_COA<<<1,32>>>(d_input,d_output+5,d_time_stamp+10);
reduceBlock_COAW<<<1,32>>>(d_input,d_output+6,d_time_stamp+12);
reduceBlock_COA_SHUFFLE<<<1,32>>>(d_input,d_output+7,d_time_stamp+14);
reduceBlock_FENCE<<<1,32>>>(d_input,d_output+9,d_time_stamp+18);
k_base_kernel<<<1,32>>>(2,4,d_output+10,d_time_stamp+20);
cudaMemcpy(h_output, d_output, sizeof(double)*20, cudaMemcpyDeviceToHost);
cudaMemcpy(h_time_stamp, d_time_stamp, sizeof(unsigned int)*40, cudaMemcpyDeviceToHost);
cudaError_t e=cudaGetLastError();
if(e!=cudaSuccess)
{
printf("Cuda failure %s:%d: '%s'\n",__FILE__,__LINE__,cudaGetErrorString(e));
}
printf("type\tserial\tnosync\ttile\ttilewarp\ttile_shuffle\tcoa\tcoawarp\tcoa_shuffle\tblock\tbasic\n");
printf("result:\t%f\t%f\t%f\t%f\t%f\t%f\t%f\t%f\t%f\t%f\n",
h_output[0],
h_output[1],
h_output[2],
h_output[3],
h_output[4],
h_output[5],
h_output[6],
h_output[7],
h_output[8],
h_output[9],
h_output[10]);
printf("time:\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
h_time_stamp[1]-h_time_stamp[0],
h_time_stamp[3]-h_time_stamp[2],
h_time_stamp[5]-h_time_stamp[4],
h_time_stamp[7]-h_time_stamp[6],
h_time_stamp[9]-h_time_stamp[8],
h_time_stamp[11]-h_time_stamp[10],
h_time_stamp[13]-h_time_stamp[12],
h_time_stamp[15]-h_time_stamp[14],
h_time_stamp[17]-h_time_stamp[16],
h_time_stamp[19]-h_time_stamp[18],
h_time_stamp[21]-h_time_stamp[20]);
}