# Clustering

Cluster can be used to run multiple instances that can distribute workloads among their application threads. When process isolation is not needed, use [`Worker`](https://bun.sh/docs/api/workers) instead, which allows running multiple application threads within a single instance.

Install the cluster module by:

```bash
bun add @stricjs/cluster
```

Here's an example of serving a web server with 4 threads.

```typescript
import { Router, macro } from '@stricjs/router';
import { spawn, worker } from '@stricjs/cluster';

if (worker) {
    const app = new Router().get('/', macro(
        () => new Response('Hi')
    ));
        
    Bun.serve(app);
} else spawn(4);
```


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