Replicaset update

[rpereira-dev]

Following this morning F2F discussions:

• Update replicaset interface from

int aml_replicaset_hwloc_create(
    struct aml_replicaset **out,
    const size_t size,
    const hwloc_obj_type_t initiator_type,
    const enum hwloc_distances_kind_e kind
);

to

int aml_replicaset_hwloc_create(
    struct aml_replicaset **out,
    const size_t size,
    const enum aml_distance_kind_e kind
);

The aml_replicaset_hwloc_local_replica remains unchanged, it always assumed the replicaset was on a core object type

• Use hwloc's memattr instead of distances interfaces, for several reasons:
  • distances currently only supports latency
  • memattr can create lists in the form: [(numa node x0, cpuset c0, distance d0), ...]

From AML perspective, implement aml_replicaset_hwloc_create as:

• sort the list by distance
• iterate through it to find a union of numa node that covers all cpus
• replicate memory on each numa node

and implement aml_replicaset_hwloc_local_replica as

• get current cpuset
• go through the list of replicate
• return the first replicate that matches the current cpuset

WIP https://github.com/anlsys/aml/tree/update-replicaset

[rpereira-dev]

Got an implementation running at https://github.com/anlsys/aml/tree/update-replicaset @perarnau