# server.ServerOptions.maxInFlight

- **Module:** server.ServerOptions
- **Package:** libtmux
- **Language:** TypeScript
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-ts/blob/3fe1ca654b81b8cbf4a13b777a001a3298c87a6f/packages/libtmux/src/server.ts#L123
- **Page:** https://libtmux.org/en/ts/latest/reference/server-serveroptions-maxinflight/

How many tmux invocations this server runs at once. Defaults to 16.

Every invocation is a tmux client process with its own pipes, so a caller
that fans out over a whole server turns its own concurrency into process
and descriptor pressure. tmux runs commands on one thread: `bench-modes.ts`
measures twelve concurrent creations costing the same twenty-five
invocations as twelve sequential ones — twenty-four either way, plus the
query that reads the result back — and arriving out of order, so the
ceiling bounds the cost without bounding the work. Waiting for a slot spends the request's own deadline,
and a request that never gets one fails `not_started`.