topic Feature requests in OpenCL* for CPU

Feature requests

rahul_garg — Tue, 22 May 2012 05:41:33 GMT

Just wanted to add two feature requests:

1. FP64 support has already been mentioned and would be the most important request for me.
2. Memory migration APIs from OpenCL 1.2 would be very nice to have

Feature requests

Doron_S_Intel — Wed, 23 May 2012 12:41:01 GMT

Could you explain a bit about why you need the memory migration APIs?

Feature requests

Doron_S_Intel — Wed, 23 May 2012 12:41:04 GMT

Could you explain a bit about why you need the memory migration APIs?

Feature requests

rahul_garg — Thu, 24 May 2012 03:17:48 GMT

Actually, disregard the memory migration API request. After looking at Intel's OpenCL optimization guide, I am now looking at avoiding copies altogether by allocating properly aligned memory :)

To explain why I initially requested memory migration APIs: Consider a GPU device. Without memory migration APIs, some drivers don't provide hard guarantees about where exactly a memory object "lives", and only that it will be made available when you launch a kernel. The driver is otherwise free to swap stuff in/out of GPU memory. This causes my application to do somewhat unpredicatable memory copies between CPU and GPU on other platforms. However, on Ivy Bridge, it looks like I can avoid memory transfers altogether if the alignment conditions are met.