wandb beta core

Usage

core [OPTIONS] COMMAND [ARGS]...

Description

Manage a shared local wandb-core service for multi-process workloads.

wandb-core is the local backend process that handles run data, file uploads, and system metrics collection. By default, each process that calls wandb.init() starts its own backend. On a machine running many independent workers, that duplicates work and wastes CPU and memory.

Use these commands to start one detached wandb-core instance and point multiple workers on the same machine at it with the WANDB_SERVICE environment variable.

Typical workflow:

wandb beta core start

export WANDB_SERVICE=printed_value

python -m your_launcher

wandb beta core stop

For shell scripts, capture the raw WANDB_SERVICE value from stdout:

export WANDB_SERVICE="$(wandb beta core start)"

The shared service exits after 10 minutes of idleness by default. Override this with —idle-timeout on the start command.

Subcommands

Command	Description
wandb beta core start	Start a detached wandb-core service.
wandb beta core stop	Stop a detached wandb-core service.