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Device Memory Properties Extension

Device Memory Properties Extension

API

Extended Device Memory Properties

Users may wish to build a cost model for computation on accelerators exposed through ‘oneAPI’ Level-Zero. Such cost models require detailed information about the properties of the accelerator such as memory bandwidth. This extension provides extended information about the memories exposed as part of a device. The extension introduces the ze_device_memory_ext_properties_t struct which can be passed to zeDeviceGetMemoryProperties via the pNext member of ze_device_memory_properties_t.

The following psuedo-code demonstrates a sequence for obtaining extended information about the memory properties of a memory module exposed as part of a device:

...
// Discover memories on device
uint32_t memCount = 0;
zeDeviceGetMemoryProperties(hDevice, &memCount, nullptr);

// Allocate properties structs
ze_device_memory_properties_t* pMemProps = allocate(memCount*sizeof(ze_device_memory_properties_t));
ze_device_memory_ext_properties_t* pExtMemProps = allocate(memCount*sizeof(ze_device_memory_ext_properties_t));

// Make pNext in memProps point at corresponding extMemProps
for (uint32_t i = 0; i < memCount; ++i) {
  pMemProps[i].stype = ZE_STRUCTURE_TYPE_DEVICE_MEMORY_PROPERTIES;
  pMemProps[i].pNext = &pExtMemProps[i];
  pExtMemProps[i].stype = ZE_STRUCTURE_TYPE_DEVICE_MEMORY_EXT_PROPERTIES;
  pExtMemProps[i].pNext = nullptr;
}

// Obtain memory & extended memory properties
zeDeviceGetMemoryProperties(hDevice, &memCount, pMemProps);