You can run multiple instances of a mapping task at the same time.
You might want to enable simultaneous task runs to load target files concurrently.
You can use multiple task instances in a Parallel Paths step of a taskflow or in two different taskflows that run in parallel. You can also run multiple instances of a mapping task simultaneously using the REST API version 2 job resource. For more information about running tasks using the job resource, see REST API Reference.
To enable simultaneous task runs, select the Allow the mapping task to be executed simultaneously on the Runtime Options page when you configure the task.
Use caution when you configure mapping tasks to run simultaneously. Mapping features that change each time the task runs, such as in-out parameters and sequence generator values, might produce unexpected results when you run the task instances simultaneously.