Yes, the PTX cooperative thread array is conceptually and functionally the same as a block in CUDA or a workgroup in OpenCL.
Question
I'm studying PTX and I don't understand how a CTA (compute thread array) is different from a CUDA block.
Are they the same thing? It seems to me that for now (I'm just at the beginning of the PTX document) they're just the same
Solution
OTHER TIPS
The Thread Hierarchy section of the CUDA PTX ISA document explains that, essentially, CTA means a CUDA block.
Also note that it's actually not a "Compute Thread Array", but rather a "Cooperative Thread Array" (!).
CTA is just another way of saying Threadblock Nvidia calls it CTA.
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