Configuration and the mapping of constant memory in CUDA

Question

I'd like to know if the configuration of constant memory changes as the underlying architecture evolves from Kepler to Volta. To be specific, I have two questions:

1) Does the sizes of constant memory and per-SM constant cache change?

2) What's the mapping from the cmem space to constant memory?

When compiling cuda code to PTX with adding '-v' to nvcc, we can see the memory usage like: ptxas info : Used 20 registers, 80 bytes cmem[0], 348 bytes cmem[2]. So does the cmem space maps to constant memory? Does accessing to each cmem space go through the on-chip constant cache?

dongxiao · Accepted Answer · 2018-10-23 01:32:25Z

1

I have found the answer for the 1st question. In the CUDA C Programming Guide, table14 shows the size of constant memory and constant cache for different CCs. The constant memory size is always 64KB from CC2.x to 6.x. The on-chip constant cache size is 8KB till CC 3.0 and increases to 10KB for the later.

edited Oct 23, 2018 at 1:32

answered Oct 22, 2018 at 13:30

dongxiao

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2 Comments

Ander Biguri Over a year ago

Please add the relevant information here, not just the link.

dongxiao Over a year ago

@AnderBiguri Sorry for that. I have added the relevant information.

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