> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wandb.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# wandb beta core
export const GitHubLink = ({url}) =>
GitHub source
;
## Usage
```bash theme={null}
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:
```bash theme={null}
wandb beta core start
```
```bash theme={null}
export WANDB_SERVICE=printed_value
```
```bash theme={null}
python -m your_launcher
```
```bash theme={null}
wandb beta core stop
```
For shell scripts, capture the raw WANDB\_SERVICE value from stdout:
```bash theme={null}
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. |