# Profiling performance relations between mmap and unified memory with host allocator

## Unified memory with host allocator

Can be realized using Address translation service for Power9 (ATS) or Heterogeneous memory management (HMM).

## Problem description

Every mmap region could add "normally" imperceptible latency to address resolution. This problem is less visible on
 CPU due to xxx. However on GPU, this could contribute to visible latency.