Which theoretical parallel model is closest to CUDA/OpenCL programming model?

For example, it fits at some degree to the generic Parallel Random Access Machine (PRAM) model. However, that is too generic, since it makes abstraction of various memory access latencies and synchronization issues.

My question is which is the theoretical model that CUDA architecture fits closest (having in mind the hierarchical parallelism of threads and blocks of threads that cooperate)?

Thank you,

Istvan Lorentz

Which theoretical parallel model is closest to CUDA/OpenCL programming model?

For example, it fits at some degree to the generic Parallel Random Access Machine (PRAM) model. However, that is too generic, since it makes abstraction of various memory access latencies and synchronization issues.

My question is which is the theoretical model that CUDA architecture fits closest (having in mind the hierarchical parallelism of threads and blocks of threads that cooperate)?