Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
As I know. Constant memory on CUDA is a specific memory. And it is faster than global memory.
But in OpenCL’s Spec. I get the following words.
The
__constantor constant address space name is used to describe variables allocated in global memory and which are accessed inside a kernel(s) as read-only variables
So the __constant memory is from the __global memory. Does that mean it have the same accessing performance with the __global memory?
It depends on the hardware and software architecture of the OpenCL platform you are using. For example, one can envision an architecture with read-only caches that don’t need to participate in cache coherency. These caches could be used for constant memory but not global memory. So you might see faster accesses to constant memory.
That being said, none of the architectures I’m familiar with operate this way. So that’s just hypothetical.