PTX - what is a CTA?

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

talonmies · Accepted Answer · 2019-11-10T11:37:15.637

13

Yes, the PTX cooperative thread array is conceptually and functionally the same as a block in CUDA or a workgroup in OpenCL.

edited Nov 10 '19 at 11:37

answered Jul 15 '13 at 08:18

talonmies

einpoklum · Answer 2 · 2017-04-23T11:17:12.287

12

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" (!).

edited Apr 23 '17 at 11:17

answered Aug 31 '16 at 12:08

einpoklum

score 1 · Answer 3 · answered Nov 13 '20 at 09:12

1

CTA is just another way of saying Threadblock Nvidia calls it CTA.

answered Nov 13 '20 at 09:12

DataCrusade1999

3 Answers3