CUDA de base Matrice Addition - grandes matrices

Question

Je tente d'ajouter deux matrices 4800x9600, mais je suis en cours d'exécution en difficultés ...

Il est un simple C = A + B ... opération

Voici le noyau:

__global__ void matAdd_kernel(float* result,float* A,float* B,int size) 
{ 
     int x=blockIdx.x*blockDim.x+threadIdx.x; 
     int y=blockIdx.y*blockDim.y+threadIdx.y; 
     int idx=x*y+x; 

     if(idx<size) 
     { 
       result[idx]=A[idx]+B[idx]; 
     } 
} 

et voici le code:

void matAdd(Matrix C,Matrix A,Matrix B) 
{ 
     int N=A.w*A.h; 
     dim3 dimBlock=dim3(22,22); 
     int yBlocks=A.w/dimBlock.y+((A.w%dimBlock.y)==0?0:1); //yBlocks is 219 for dimBlock(22,22) and 9600x4800 
     int xBlocks=A.h/dimBlock.x+((A.h%dimBlock.x)==0?0:1); //xBlocks is 437 for dimBlock(22,22) and 9600x4800 
     dim3 dimGrid=dim3(xBlocks,yBlocks); 
     matAdd_kernel<<<dimGrid,dimBlock>>>(C.data,A.data,B.data,N); 
     cutilCheckMsg("kernel launch failure"); 
} 

J'utilise une matrice comme suit:

typedef struct{ 
     int w; 
     int h; 
     float* data; 
}Matrix; 

Et est ici la sortie lorsque j'imprime le top 10 lignes et bas-10 lignes:

top-10 rows A: 
-0.023930 0.047744 -0.074694 0.053555 -0.032298 0.038762 -0.068890 0.088894 -0.044989 0.005679 -0.054846 0.064743 
-0.070026 0.059445 -0.078712 0.001957 -0.050910 0.067603 -0.089646 0.076562 -0.039840 0.052980 -0.074809 0.037390 
-0.042785 0.087303 -0.005369 0.017769 -0.075572 0.075981 -0.064457 0.067737 -0.045192 0.046887 -0.030999 0.006888 
-0.040708 0.020566 -0.089926 0.082820 -0.010478 0.021086 -0.086581 0.095966 -0.054339 0.068906 -0.060855 0.087460 
-0.059717 0.038708 -0.026613 0.053984 -0.088490 0.066764 -0.005617 0.091969 -0.018239 0.097972 -0.073692 0.010064 
-0.052374 0.048555 -0.037706 0.043377 -0.071556 0.075888 -0.002523 0.037950 -0.065693 0.078094 -0.011694 0.039196 
-0.092799 0.011099 -0.056766 0.091866 -0.059577 0.029236 -0.063502 0.091717 -0.030844 0.079273 -0.087244 0.048310 
-0.089582 0.004614 -0.002560 0.058306 -0.006922 0.097391 -0.099892 0.039699 -0.036129 0.038520 -0.084387 0.012408 
-0.054143 0.048351 -0.006309 0.002902 -0.073858 0.012903 -0.089030 0.041077 -0.034445 0.030259 -0.071056 0.002762 
-0.048605 0.047165 -0.082960 0.096326 -0.066084 0.029297 -0.070599 0.034394 -0.044475 0.075287 -0.063274 0.023137 
-0.033560 0.030527 -0.019907 0.078961 -0.052821 0.088959 -0.0.061808 -0.020862 0.058320 -0.028586 0.079149 
-0.087878 0.034127 -0.040097 0.092205 -0.033817 0.099641 -0.002590 0.012473 -0.050764 0.093213 -0.065811 0.075233 

bottom-10 rows A: 
0.006791 -0.015538 0.072625 -0.049761 0.029860 -0.093147 0.023192 -0.031281 0.030545 -0.068470 0.020244 
0.014509 -0.057081 0.049269 -0.047556 0.022443 -0.092672 0.065184 -0.030968 0.097352 -0.052493 0.062981 
0.004188 -0.028991 0.063084 -0.082578 0.005537 -0.030271 0.038801 -0.043018 0.066686 -0.004677 0.054946 
0.013995 -0.011381 0.075888 -0.069206 0.012784 -0.009126 0.068735 -0.066544 0.070738 -0.055201 0.097867 
0.083719 -0.007838 0.018854 -0.098974 0.023769 -0.044483 0.028541 -0.032198 0.047691 -0.005788 0.039455 
0.066290 -0.033136 0.097825 -0.051469 0.012732 -0.038881 0.076786 -0.069891 0.084848 -0.050189 0.017055 
0.077407 -0.088394 0.006851 -0.047383 0.081140 -0.094065 0.002880 -0.072353 0.095627 -0.096577 0.025683 
0.023140 -0.008283 0.096901 -0.011595 0.031076 -0.079637 0.050198 -0.014112 0.027430 -0.012270 0.054234 
0.011981 -0.053835 0.076015 -0.062570 0.082806 -0.040616 0.030618 -0.003141 0.031599 -0.093869 0.048415 
0.065879 -0.060177 0.085832 -0.000699 0.038540 -0.014198 0.018127 -0.013525 0.094031 -0.072898 0.083781 
0.056596 -0.090405 0.092818 -0.013577 0.078385 -0.061543 0.053441 -0.092938 0.032074 -0.017903 0.051810 

top-10 rows B: 
-0.023930 0.047744 -0.074694 0.053555 -0.032298 0.038762 -0.068890 0.088894 -0.044989 0.005679 -0.054846 0.064743 
-0.070026 0.059445 -0.078712 0.001957 -0.050910 0.067603 -0.089646 0.076562 -0.039840 0.052980 -0.074809 0.037390 
-0.042785 0.087303 -0.005369 0.017769 -0.075572 0.075981 -0.064457 0.067737 -0.045192 0.046887 -0.030999 0.006888 
-0.040708 0.020566 -0.089926 0.082820 -0.010478 0.021086 -0.086581 0.095966 -0.054339 0.068906 -0.060855 0.087460 
-0.059717 0.038708 -0.026613 0.053984 -0.088490 0.066764 -0.005617 0.091969 -0.018239 0.097972 -0.073692 0.010064 
-0.052374 0.048555 -0.037706 0.043377 -0.071556 0.075888 -0.002523 0.037950 -0.065693 0.078094 -0.011694 0.039196 
-0.092799 0.011099 -0.056766 0.091866 -0.059577 0.029236 -0.063502 0.091717 -0.030844 0.079273 -0.087244 0.048310 
-0.089582 0.004614 -0.002560 0.058306 -0.006922 0.097391 -0.099892 0.039699 -0.036129 0.038520 -0.084387 0.012408 
-0.054143 0.048351 -0.006309 0.002902 -0.073858 0.012903 -0.089030 0.041077 -0.034445 0.030259 -0.071056 0.002762 
-0.048605 0.047165 -0.082960 0.096326 -0.066084 0.029297 -0.070599 0.034394 -0.044475 0.075287 -0.063274 0.023137 
-0.033560 0.030527 -0.019907 0.078961 -0.052821 0.088959 -0.0.061808 -0.020862 0.058320 -0.028586 0.079149 
-0.087878 0.034127 -0.040097 0.092205 -0.033817 0.099641 -0.002590 0.012473 -0.050764 0.093213 -0.065811 0.075233 

bottom-10 rows B: 
0.006791 -0.015538 0.072625 -0.049761 0.029860 -0.093147 0.023192 -0.031281 0.030545 -0.068470 0.020244 
0.014509 -0.057081 0.049269 -0.047556 0.022443 -0.092672 0.065184 -0.030968 0.097352 -0.052493 0.062981 
0.004188 -0.028991 0.063084 -0.082578 0.005537 -0.030271 0.038801 -0.043018 0.066686 -0.004677 0.054946 
0.013995 -0.011381 0.075888 -0.069206 0.012784 -0.009126 0.068735 -0.066544 0.070738 -0.055201 0.097867 
0.083719 -0.007838 0.018854 -0.098974 0.023769 -0.044483 0.028541 -0.032198 0.047691 -0.005788 0.039455 
0.066290 -0.033136 0.097825 -0.051469 0.012732 -0.038881 0.076786 -0.069891 0.084848 -0.050189 0.017055 
0.077407 -0.088394 0.006851 -0.047383 0.081140 -0.094065 0.002880 -0.072353 0.095627 -0.096577 0.025683 
0.023140 -0.008283 0.096901 -0.011595 0.031076 -0.079637 0.050198 -0.014112 0.027430 -0.012270 0.054234 
0.011981 -0.053835 0.076015 -0.062570 0.082806 -0.040616 0.030618 -0.003141 0.031599 -0.093869 0.048415 
0.065879 -0.060177 0.085832 -0.000699 0.038540 -0.014198 0.018127 -0.013525 0.094031 -0.072898 0.083781 
0.056596 -0.090405 0.092818 -0.013577 0.078385 -0.061543 0.053441 -0.092938 0.032074 -0.017903 0.051810 

top-10 rows C: 
-0.047860 0.095488 -0.149388 0.107110 -0.064596 0.077524 -0.137780 0.177788 -0.089978 0.011358 -0.109692 0.129486 
-0.140052 0.118890 -0.157424 0.003913 -0.101820 0.135206 -0.179292 0.153124 -0.079680 0.105960 -0.149618 0.074780 
-0.085570 0.174606 -0.010738 0.035538 -0.151144 0.151962 -0.128914 0.135474 -0.090384 0.093774 -0.061998 0.013776 
-0.081416 0.000000 -0.179852 0.165640 -0.020956 0.042172 -0.173162 0.000000 -0.108678 0.137812 -0.121710 0.000000 
-0.119434 0.077416 -0.053226 0.107968 -0.176980 0.133528 -0.011234 0.000000 -0.036478 0.195944 -0.147384 0.000000 
-0.104748 0.000000 -0.075412 0.086754 -0.143112 0.151776 -0.005047 0.000000 -0.131386 0.156188 -0.023388 0.078392 
-0.185598 0.022198 0.000000 0.183732 -0.119154 0.058472 -0.127004 0.000000 -0.061688 0.158546 -0.174488 0.096620 
-0.179164 0.000000 -0.005121 0.116612 -0.013844 0.194782 -0.199784 0.079398 -0.072258 0.077040 -0.168774 0.024816 
-0.108286 0.096702 -0.012618 0.005803 -0.147716 0.025806 -0.178060 0.082154 -0.068890 0.060518 -0.142112 0.005524 
-0.097210 0.000000 0.000000 0.000000 -0.132168 0.058594 -0.141198 0.000000 -0.088950 0.150574 -0.126548 0.046274 
-0.067120 0.061054 0.000000 0.000000 -0.105642 0.177918 -0.086420 0.123616 -0.041724 0.116640 -0.057172 0.158298 
-0.175756 0.068254 -0.080194 0.184410 -0.067634 0.199282 -0.005179 0.000000 -0.101528 0.186426 -0.131622 0.150466 

bottom-10 rows C: 
0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 
0.029018 0.000000 0.000000 0.000000 0.000000 0.000000 0.130368 0.000000 0.000000 0.000000 0.000000 
0.000000 -0.057982 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 
0.000000 0.000000 0.151776 0.000000 0.000000 0.000000 0.000000 -0.133088 0.000000 0.000000 0.000000 
0.000000 0.000000 0.000000 -0.197948 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 
0.000000 0.000000 0.000000 0.000000 0.025464 0.000000 0.000000 0.000000 0.169696 0.000000 0.000000 
0.000000 0.000000 0.000000 0.000000 0.000000 -0.188130 0.000000 0.000000 0.000000 0.000000 0.000000 
0.000000 0.000000 0.193802 0.000000 0.000000 0.000000 0.100396 0.000000 0.000000 -0.024540 0.000000 
0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 -0.006282 0.000000 0.000000 0.000000 
0.000000 -0.120354 0.000000 0.000000 0.000000 -0.028396 0.000000 0.000000 0.188062 0.000000 0.167562 
0.000000 0.000000 0.000000 -0.027154 0.000000 0.000000 0.000000 0.000000 0.000000 -0.035806 0.000000 

Comme vous pouvez le voir, C = A + B juste ne fonctionne pas .. C'est bon pour la partie supérieure de la matrice, mais ça va dans la moitié inférieure. Je n'ai aucune idée d'où viennent tous ces zéros ...

Est-ce que je fais quelque chose de mal?

Toute idée grandement appréciée. Un grand merci à l'avance,

Answer 1

La partie de votre code qui colle à moi le plus est:

int idx=x*y+x; 

Je crois que ce que vous voulez dire:

int idx=maxX*y + x; 

Sinon, si x=0 et y=1000 , puis idx=0.

Cela expliquerait aussi pourquoi cela fonctionne pour certains comme y=0 et pas pour d'autres.

Vous aurez besoin de transmettre la valeur X maximale pour votre matrice.

Espérons que ça aide!