mmap and pinned memory How to share a pinned buffer between several linux processes ?

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello,

I have 2 processes (on linux). The first process can allocate pinned memory (cudahostalloc).

I would like to allow the second process to write directly on the pinned memory buffer allocated by the first process.

So, I need to map the address space of the pinned buffer on my second process address space. Nevertheless, it seems to be impossible to use shared memory (like mmap or shm_open) because mmap must allocate itself the memory to map (and cudahostalloc allocate the memory).

Do you now a solution to share a pinned buffer between several linux processes ?

Thanks

Matt

2

Dunno if you’re still interested in an answer for this problem.
Anyway, it seems that the new UVA functionality added in CUDA 4.0 will solve that problem for you.