I’m looking how to implement an inversion of a matrix in GPU .I try to do it with a single thread per block based on the Gauss-Jordan elimination algorithm (with cuda) but I need a matrix inversion which assigned multiple threads per block. so ,I am trying to run it Using Cublas . i found this code but when i execute it , many errors are display and i can’t understand these errors .noted that I am a novice student in CUDA.
#include <cstdio>
#include <cstdlib>
#include <cuda_runtime.h>
#include <cublas_v2.h>
#define cudacall(call) \
do \
{ \
cudaError_t err = (call); \
if(cudaSuccess != err) \
{ \
fprintf(stderr,"CUDA Error:\nFile = %s\nLine = %d\nReason = %s\n", __FILE__, __LINE__, cudaGetErrorString(err)); \
cudaDeviceReset(); \
exit(EXIT_FAILURE); \
} \
} \
while (0)
#define cublascall(call) \
do \
{ \
cublasStatus_t status = (call); \
if(CUBLAS_STATUS_SUCCESS != status) \
{ \
fprintf(stderr,"CUBLAS Error:\nFile = %s\nLine = %d\nCode = %d\n", __FILE__, __LINE__, status); \
cudaDeviceReset(); \
exit(EXIT_FAILURE); \
} \
\
} \
while(0)
void invert_device(float* src_d, float* dst_d, int n)
{
cublasHandle_t handle;
cublascall(cublasCreate_v2(&handle));
int batchSize = 1;
int *P, *INFO;
cudacall(cudaMalloc<int>(&P,17 * batchSize * sizeof(int)));
cudacall(cudaMalloc<int>(&INFO,batchSize * sizeof(int)));
int lda = 17;
float *A[] = { src_d };
float** A_d;
cudacall(cudaMalloc<float*>(&A_d,sizeof(A)));
cudacall(cudaMemcpy(A_d,A,sizeof(A),cudaMemcpyHostToDevice));
cublascall(cublasSgetrfBatched(handle,17,A_d,lda,P,INFO,batchSize));
int INFOh = 0;
cudacall(cudaMemcpy(&INFOh,INFO,sizeof(int),cudaMemcpyDeviceToHost));
if(INFOh == 17)
{
fprintf(stderr, "Factorization Failed: Matrix is singular\n");
cudaDeviceReset();
exit(EXIT_FAILURE);
}
float* C[] = { dst_d };
float** C_d;
cudacall(cudaMalloc<float*>(&C_d,sizeof(C)));
cudacall(cudaMemcpy(C_d,C,sizeof(C),cudaMemcpyHostToDevice));
cublascall(cublasSgetriBatched(handle,n,A_d,lda,P,C_d,n,INFO,batchSize));
cudacall(cudaMemcpy(&INFOh,INFO,sizeof(int),cudaMemcpyDeviceToHost));
if(INFOh != 0)
{
fprintf(stderr, "Inversion Failed: Matrix is singular\n");
cudaDeviceReset();
exit(EXIT_FAILURE);
}
cudaFree(P), cudaFree(INFO), cublasDestroy_v2(handle);
}
void invert(float* src, float* dst, int n)
{
float* src_d, *dst_d;
cudacall(cudaMalloc<float>(&src_d,17 * 17 * sizeof(float)));
cudacall(cudaMemcpy(src_d,src,17 * 17 * sizeof(float),cudaMemcpyHostToDevice));
cudacall(cudaMalloc<float>(&dst_d,n * n * sizeof(float)));
invert_device(src_d,dst_d,n);
cudacall(cudaMemcpy(dst,dst_d,n * n * sizeof(float),cudaMemcpyDeviceToHost));
cudaFree(src_d), cudaFree(dst_d);
}
void test_invert()
{
const int n = 3;
//Random matrix with full pivots
/* float full_pivots[n*n] = { 0.5, 3, 4,
1, 3, 10,
4 , 9, 16 };
//Almost same as above matrix with first pivot zero
float zero_pivot[n*n] = { 0, 3, 4,
1, 3, 10,
4 , 9, 16 };
float zero_pivot_col_major[n*n] = { 0, 1, 4,
3, 3, 9,
4 , 10, 16 };
*/
float zero_pivot_war[17*17] = {
0,3,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,3,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
4,9,16,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 };
/*
float another_zero_pivot[n*n] = { 0, 3, 4,
1, 5, 6,
9, 8, 2 };
float another_full_pivot[n * n] = { 22, 3, 4,
1, 5, 6,
9, 8, 2 };
float singular[n*n] = {1,2,3,
4,5,6,
7,8,9};
*/
float result[n*n];
//Select matrix by setting "a"
float* a = zero_pivot_war;
fprintf(stdout, "Input:\n\n");
for(int i=0; i<n; i++)
{
for(int j=0; j<n; j++)
fprintf(stdout,"%f\t",a[i*17+j]);
fprintf(stdout,"\n");
}
fprintf(stdout,"\n\n");
invert(a,result,n);
fprintf(stdout, "Inverse:\n\n");
for(int i=0; i<n; i++)
{
for(int j=0; j<n; j++)
fprintf(stdout,"%f\t",result[i*n+j]);
fprintf(stdout,"\n");
}
}
int main()
{
test_invert();
// int n; scanf("%d",&n);
return 0;
}