It can be freed in a different kernel, though. _device_ float* pointer cudaMalloc( &pointer, size ) cudaFree( pointer ) // direction is one of cudaMemcpyHostToDevice or cudaMemcpyDeviceToHostcudaMemcpy( dst_pointer, src_pointer, size, direction ) _constant_ float dev_data float host_data cudaMemcpyToSymbol ( dev_data, host_data, sizeof(host_data) ) // dev_data = host_datacudaMemcpyFromSymbol( host_data, dev_data, sizeof(host_data) ) // host_data = dev_dataĪlso, malloc and free work inside a kernel (2.x), but memory allocated in a kernel must be deallocated in a kernel (not the host). Wait until memory accesses are visible to block and device and host (2.x) Wait until memory accesses are visible to block and device Wait until memory accesses are visible to block ) Thread management _threadfence_block() ) dim3 blocks( nx, ny, nz ) // cuda 1.x has 1D and 2D grids, cuda 2.x adds 3D gridsdim3 threadsPerBlock( mx, my, mz ) // cuda 1.x has 1D, 2D, and 3D blockskernel>(. ) ĭim3 can take 1, 2, or 3 argumetns: dim3 blocks1D( 5 ) dim3 blocks2D( 5, 5 ) dim3 blocks3D( 5, 5, 5 ) Pre-defined variables dim3 gridDim ), for example: float2 xx = make_float2( 1., 2. Vector typeschar1, uchar1, short1, ushort1, int1, uint1, long1, ulong1, float1char2, uchar2, short2, ushort2, int2, uint2, long2, ulong2, float2char3, uchar3, short3, ushort3, int3, uint3, long3, ulong3, float3char4, uchar4, short4, ushort4, int4, uint4, long4, ulong4, float4longlong1, ulonglong1, double1longlong2, ulonglong2, double2dim3Ĭomponents are accessible as variable.x, variable.y, variable.z, variable.w.Ĭonstructor is make_( x. Most routines return an error code of type cudaError_t. Standard C definition that pointers are not aliased cu files, which contain mixture of host (CPU) and device (GPU) code.Declaring functions _global_ĭeclares kernel, which is called on host and executed on deviceĭeclares device function, which is called and executed on deviceĭeclares host function, which is called and executed on hostĭeclares device variable in global memory, accessible from all threads, with lifetime of applicationĭeclares device variable in constant memory, accessible from all threads, with lifetime of applicationĭeclares device varibale in block's shared memory, accessible from all threads within a block, with lifetime of block
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