# opatop

Starts the Fabric Performance Monitor (`opatop`) Text-based User Interface (TUI) menu to display performance, congestion, and error information about a fabric.

## Syntax

    opatop [-v] [-q] [-h hfi] [-p port] [--timeout] [-i seconds]

## Options

`--help`

  Produces full help text.

`-v/--verbose level`
  Specifies the verbose output level. Value is additive and includes:
  `1`
    Screen
  `4`
    STDERR opatop
  `16`
    STDERR PaClient
`-q/--quiet`
  Disables progress reports.
`-h/--hfi hfi`

  Specifies the HFI, numbered 1..n. Using 0 specifies that the `-p port` port is a system-wide port number. Default is 0.

`-p/--port port`

  Specifies the port, numbered 1..n. Using 0 specifies the first active port. Default is 0.

`--timeout`

  Specifies the timeout (response wait time) in ms. Default is 1000 ms.

`-i/--interval seconds`

  Interval in `seconds` at which PA queries are performed to refresh to the latest PA image. Default is 10 seconds.

## -h and -p options permit a variety of selections:

`-h 0`

  First active port in system (Default).

`-h 0 -p 0`

  First active port in system.

`-h x`

  First active port on HFI x.

`-h x -p 0`

  First active port on HFI x.

`-h 0 -p y`

  Port y within system (no matter which ports are active).

`-h x -p y`

  HFI x, port y.