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# Start a Task

To create a task, send an `AddTask` ACI action to your HPE IDOL Speech Server host and ACI port.

For example:

    http://host:port/action=AddTask&Type=task&requiredParams&optionalParams

where:

`host` | is the IP address or name of the machine where HPE IDOL Speech Server is installed.
`port` | is the ACI port by which actions are sent to HPE IDOL Speech Server (set by the `Port` parameter in the HPE IDOL Speech Server configuration file's `[Server]`section).
`task` | is the name of the configuration section where the options for the task are defined in the HPE IDOL Speech Server tasks configuration file.
`requiredParams` | You must supply `requiredParams` for the action you request. (Not all tasks have required parameters.)
`optionalParams` | You can supply `optionalParams` for the action you request. (Not all tasks have optional parameters.)

For example:

    http://localhost:13000/action=AddTask&Type=WavToText&File=Speech.wav&Out=Text.ctm

This action creates a `WavToText` task on the HPE IDOL Speech Server located on the local machine, with the ACI port `13000`.

## Run Tasks Across Multiple Cores

Some tasks can run across multiple cores for faster performance. The audio to process is split into chunks, which are shared out between the HPE IDOL Speech Server task managers ( HPE recommends that you set one task manager for each core). Each task manager processes its allocated chunks, and the results from all task managers are combined at the end.

The following modules support multicore processing. If you request multicore processing for a task that contains modules that are not in this list, HPE IDOL Speech Server returns an error.

`audiopreproc` | `mixer` | `stream`
`ctm` | `normalizer` | `stt`
`filter` | `plh` | `wav`
`frontend` | `postproc` | `wout`

When using the `stt` module, multiple core processing is semantically meaningful only in fixed mode; relative mode is not supported.

Each running task manager counts as an HPE IDOL Speech Server instance. If insufficient licenses are available for the task, HPE IDOL Speech Server returns an error.

Multicore processing is not supported if server queuing is enabled (see Configure Task Queues).

To run a task on multiple cores, you must set the following three action parameters when you send the `AddTask` action.

`TaskManagers` | The number of task managers to split the task across. If you specify more task managers than are available, HPE IDOL Speech Server returns an error.
`SplitSize` | The size of the chunks, in seconds, to divide the audio into. For most tasks, HPE recommends between 60 and 300 seconds.
`Overlap` | The number of seconds of overlap between chunks. Increasing the overlap improves accuracy but reduces the overall processing speed. For most tasks, HPE recommends an overlap of about 5 seconds.

For example:

    http://localhost:13000/action=AddTask&Type=WavToText&File=Speech.wav&Out=Text.ctm&TaskManagers=3

This action creates a `WavToText` task across three task managers on the HPE IDOL Speech Server located on the local machine, with the ACI port `13000`.

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