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Can anyone tell me what the units of NVIDIA cuda registers are? When I have 8192 registers per block, it means is in bytes or bits?
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Each compute unit contains multiple graphics processors called Processing Elements (PEs) in OpenCL terminology. Nvidia calls them CUDA cores or Compute Cores. Intel refers to them as Execution Units (EUs).
AMD would call them "compute units". Also "CUDA cores" would be called "shader units" or "stream processors" by AMD.
In general all scalar variables defined in CUDA code are stored in registers. Registers are local to a thread, and each thread has exclusive access to its own registers: values in registers cannot be accessed by other threads, even from the same block, and are not available for the host.
GPU Architecture This GPU has 16 streaming multiprocessor (SM), which contains 32 cuda cores each. Every cuda is an execute unit for integer and float numbers.
Each of the registers is a 32-bit register, i.e. there are 4 bytes per register.
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