how do numactl & perf change memory placement policy of child processes?
TL;DR: The default policy used by numactl can cause performances issues as well as the OpenMP thread binding. numactl constraints are applied to all (forked) children process. Indeed, numactl use a predefined policy by default. This policy is can be –interleaved, –preferred, –membind, –localalloc. This policy change the behavior of the operating system page allocation … Read more