The struct reference describes the
int id
Member as:
“identifier for a given this location’s CUmemLocationType.”
This sentence is missing a word. I believe it should read:
“identifier for a device given this location’s CUmemLocationType.”
Is this guess correct? If not, then what is the id member for?
The location type modifies the meaning of id. Depending on location type, you can see some of the possible meanings of id here.
CU_MEM_LOCATION_TYPE_INVALID = 0x0
CU_MEM_LOCATION_TYPE_DEVICE = 0x1
Location is a device location, thus id is a device ordinal
CU_MEM_LOCATION_TYPE_HOST = 0x2
Location is host, id is ignored
CU_MEM_LOCATION_TYPE_HOST_NUMA = 0x3
Location is a host NUMA node, thus id is a host NUMA node id
CU_MEM_LOCATION_TYPE_HOST_NUMA_CURRENT = 0x4
Location is a host NUMA node of the current thread, id is ignored
CU_MEM_LOCATION_TYPE_MAX = 0x7FFFFFFF
Aha that makes sense. Thanks for response.