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POCopy array of structure from host to device using constant memory
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copied!<p>I want to copy the int m_CellParticleNumber and m_aCellParticleID[CELLMAXPARTICLENUM] value from host to device.For this i use constant memory. But i am not being able to copy the value to the constant memory. can you please help me in this code for copying the value.</p> <pre><code>#include "cuda_runtime.h" #include "device_launch_parameters.h" #include <stdio.h> #include <memory> #include<iostream> #define m_CellNum 100 #define CELLMAXPARTICLENUM 100 int numPartilces = 10; extern void Initialize(); struct CCell { int m_CellParticleNumber ; int m_aCellParticleID[CELLMAXPARTICLENUM]; } ; CCell* hvalue; CCell* dvalue; int* dCellParticleID; __constant__ CCell* c_value; __global__ void Sum_constant(CCell* value, int N) { int index; index = blockIdx.x * blockDim.x + threadIdx.x; if (index<N) for(int idx=0;idx<N ;++idx) value[index].m_aCellParticleID[idx]= value[index].m_aCellParticleID[idx]+ c_value[index].m_aCellParticleID[idx] ; //return; } int main() { hvalue = new CCell[m_CellNum]; cudaMalloc((void**)&dvalue,m_CellNum * sizeof(CCell)); //calling function to initialize the value Initialize(); //initializing the device momory cudaMemcpy(dvalue, hvalue, sizeof(CCell)*m_CellNum,cudaMemcpyHostToDevice); //copying value to constant memory cudaMemcpyToSymbol(c_value->m_aCellParticleID, &dvalue->m_aCellParticleID, sizeof(int)*m_CellNum); //dividing bolcks and grid int block_size = 4; int n_blocks = numPartilces/block_size + (numPartilces%block_size == 0 ? 0:1); //invocking kernel function Sum_constant <<< n_blocks, block_size >>> (c_value,numPartilces); //copying value from host to device cudaMemcpy(hvalue, dvalue,numPartilces * sizeof(int),cudaMemcpyDeviceToHost); //showing result for(int i = 0; i < 2; ++i) { for(int j = 0; j < numPartilces; ++j) { std::cout<<hvalue[i].m_aCellParticleID[j]<<"\n"; } } free(hvalue); cudaFree(dvalue); return 0; } void Initialize() { cudaMalloc((void**)&dCellParticleID,m_CellNum * sizeof(int)); for(int i = 0; i < numPartilces; ++i) { hvalue[i].m_CellParticleNumber = 0; for(int j = 0; j < numPartilces; ++j) { hvalue[i].m_aCellParticleID[j] = j+2; } hvalue[i].m_CellParticleNumber++; } } </code></pre> <hr> <p>This is what i tried according to the suggestion given but still it dont works. can you please help me. #include "cuda_runtime.h" #include "device_launch_parameters.h"</p> <pre><code> #include <stdio.h> #include <memory> #include<iostream> #define m_CellNum 100 #define CELLMAXPARTICLENUM 100 int numPartilces = 10; extern void Initialize(); struct CCell { int m_CellParticleNumber ; int m_aCellParticleID[CELLMAXPARTICLENUM]; } ; CCell* hvalue; CCell* dvalue; int* dCellParticleID; __constant__ CCell c_value[m_CellNum]; __global__ void Sum_constant(CCell* value, int N) { int index; index = blockIdx.x * blockDim.x + threadIdx.x; if (index<N) for(int idx=0;idx<N ;++idx) value[index].m_aCellParticleID[idx]= value[index].m_aCellParticleID[idx]+ c_value[index].m_aCellParticleID[idx] ; //return; } int main() { int numPartilces = 10; hvalue = new CCell[m_CellNum]; cudaMalloc((void**)&dvalue,m_CellNum * sizeof(CCell)); //calling function to initialize the value Initialize(); //initializing the device momory cudaMemcpy(dvalue, hvalue, sizeof(CCell)*m_CellNum,cudaMemcpyHostToDevice); //copying value to constant memory cudaMemcpyToSymbol(c_value, &dvalue, sizeof(dvalue)); //dividing bolcks and grid int block_size = 4; int n_blocks = numPartilces/block_size + (numPartilces%block_size == 0 ? 0:1); //invocking kernel function Sum_constant <<< n_blocks, block_size >>> (dvalue,numPartilces); //copying value from host to device cudaMemcpy(hvalue, dvalue,2*m_CellNum * sizeof(int),cudaMemcpyDeviceToHost); //showing result for(int i = 0; i < numPartilces; ++i) { for(int j = 0; j < numPartilces; ++j) { std::cout<<hvalue[i].m_aCellParticleID[j]<<"\n"; } } free(hvalue); cudaFree(dvalue); return 0; } void Initialize() { cudaMalloc((void**)&dCellParticleID,m_CellNum * sizeof(int)); for(int i = 0; i < numPartilces; ++i) { hvalue[i].m_CellParticleNumber = 0; for(int j = 0; j < numPartilces; ++j) { hvalue[i].m_aCellParticleID[j] = j+2; } hvalue[i].m_CellParticleNumber++; } } </code></pre>

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