Automatic Core Specialization for AVX-512 Applications
Mathias Gottschlag, Peter Brantsch, Frank Bellosa
Abstract
Advanced Vector Extension (AVX) instructions operate on wide SIMD vectors. Due to the resulting high power consumption, recent Intel processors reduce their frequency when executing complex AVX2 and AVX-512 instructions. Following non-AVX code is slowed down by this frequency reduction in two situations: When it executes on the sibling hyperthread of the same core in parallel or - as restoring the non-AVX frequency is delayed - when it directly follows the AVX2/AVX-512 code. As a result, heterogeneous workloads consisting of AVX-512 and non-AVX code are frequently slowed down by 10% on average.
Topics & Concepts
Parallel computingPhysicsInstruction setComputer scienceParallel Computing and Optimization TechniquesEmbedded Systems Design TechniquesAdvanced Data Storage Technologies