How deeply does Elixir in Action, Third Edition cover process group?

Explains startup, joining, membership queries, and update coordination, but stops short of detailed failure semantics.

Process group

As explained in Elixir in Action, Third Edition

A process group is a named cluster-wide collection of processes that can be queried as a set for communication or coordination.

A process group is a named, cluster-wide collection of processes. It lets distributed nodes categorize replicas, discover group members, and broadcast coordination messages across them. section 12.1.3

Using the :pg module follows a small operational workflow:

Join processes to an arbitrarily named group with :pg.join/2. section 12.1.3
Query membership with :pg.get_members/1, then send requests to every returned process when all replicas must be updated. section 12.1.3

Replicated to-do lists

Place each node's process responsible for Bob's to-do list in {:todo_list, "bob"}. Broadcast updates to every group member so replicas stay synchronized; query one member when reading. section 12.1.3

How Elixir in Action, Third Edition covers it

Cover of Elixir in Action, Third Edition

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Also explained in

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Distributed Machine Learning PatternsA worker process group is a set of worker processes that participate together in distributed computation and collective communication.
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Deep Learning with PyTorch, Second EditionThe set of processes participating in a coordinated distributed-training run and sharing communication context.

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Related concepts

:pgimplemented by · :pg is an Erlang library module for creating cluster-wide process groups and managing their membership.
allreduceuses · Allreduce is a collective communication operation that combines corresponding values across participating processes or devices and distributes the resulting aggregate to every participant.
DeviceMeshimplemented by · A PyTorch distributed abstraction for arranging devices into a mesh and defining communication along its dimensions.
torch.distributed.init_process_groupimplements · A PyTorch distributed-training function that initializes the process group and establishes communication among participating processes.
distributed trainingused by · Distributed training is the coordinated training of a machine-learning model across multiple computing devices, processes, or machines by distributing computation or data among them.
process registrykind of · A process registry is a component that associates application-defined names or keys with process identifiers for registration and lookup.

This explainer was generated by Manning's knowledge graph from the text of Elixir in Action, Third Edition. The section links point to the parts of the book it draws on.