Restricted USM: prefetch

Performance Hints

Programmers may provide hints to the runtime that data should be made available on a device earlier than Unified Shared Memory would normally require. This can be accomplished by enqueueing prefetch commands.

Prefetch commands may not be overlapped with kernel execution in Restricted USM.

prefetch

class handler {
 ...
 public:
  ...
  void prefetch(const void* ptr, size_t num_bytes);
};

class queue {
 ...
 public:
  ...
  void prefetch(const void* ptr, size_t num_bytes);
};

Parameters

const void* ptr

Pointer to the memory to be prefetched to the device

size_t num_bytes

Number of bytes requested to be prefetched

Return Value

None