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---
name: concurrency-limit
description: "Inspect or change global and per-host limits on concurrently running BB threads."
---
# Concurrency limits
Use `bb concurrency-limit status --json` to inspect current limits.
```sh
bb concurrency-limit global [unlimited|<limit>] [--json]
bb concurrency-limit host <host-id> [auto|<limit>] [--json]
```
Automatic host limits allow one thread per available processor. Resolve the host
with `bb machine list` before changing a host limit. Omit the value to inspect it;
change limits only for the requested scope and verify the resulting status.
