cpus

The cpus directive defines the number of CPUs required by each task execution. For example:

process blast {
    cpus 8

    script:
    """
    blastp -query input_sequence -num_threads ${task.cpus}
    """
}

This directive is required for tasks that execute multi-process or multi-threaded commands/tools and it is meant to reserve enough CPUs when a pipeline task is executed through a cluster resource manager.

See also: disk, memory, time, queue, dynamic task resources