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\subsection{CUDA Memory Model}  Similar to a CPU's architecture, the GPU also has multiple types of memory available to it. At the highest level we have there are  global and constant memory. When moving non-primitive values from the host to the GPU the developer must either copy into the GPU's global or constant memory. Constant memory is significantly fast faster  (quote to come) than global memory however it is immutable. Once the memory is on the GPU the developer can either access it directly from all threads and all blocks or subdivide the memory into local or shared memory. Local memory is accessible on a per thread basis and is the fastest type of memory available whereas shared memory is accessible to all threads within a block.