![]() Old = atomicSub ( &addr, value ) // old = *addr *addr –= value Atomic functions old = atomicAdd ( &addr, value ) // old = *addr *addr += value It can be freed in a different kernel, though. direction is one of cudaMemcpyHostToDevice or cudaMemcpyDeviceToHostĬudaMemcpy( dst_pointer, src_pointer, size, direction ) ĬudaMemcpyToSymbol ( dev_data, host_data, sizeof(host_data) ) // dev_data = host_dataĬudaMemcpyFromSymbol( 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 ) ĭim3 blocks( nx, ny, nz ) // cuda 1.x has 1D and 2D grids, cuda 2.x adds 3D gridsĭim3 threadsPerBlock( mx, my, mz ) // cuda 1.x has 1D, 2D, and 3D blocks ) ĭim3 can take 1, 2, or 3 argumetns: dim3 blocks1D( 5 ) ), for example: float2 xx = make_float2( 1., 2. Vector types char1, uchar1, short1, ushort1, int1, uint1, long1, ulong1, float1Ĭhar2, uchar2, short2, ushort2, int2, uint2, long2, ulong2, float2Ĭhar3, uchar3, short3, ushort3, int3, uint3, long3, ulong3, float3Ĭhar4, uchar4, short4, ushort4, int4, uint4, long4, ulong4, float4Ĭomponents 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 ![]() 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 cu files, which contain mixture of host (CPU) and device (GPU) code.
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