command.sh

$ rally task start concurrent-boot-and-delete.yaml --task-args "{'nr_times': 20, 'nr_concurrent': 2}"

gistfile1.yml

{% set nr_concurrent = 1 %}
{% set nr_times = 10 %}
---
  NovaServers.boot_and_delete_server:
    -
      args:
        image:
            name: "^Ubuntu*"
        flavor:
            name: "m1.medium"
      runner:
        type: "constant"
        times: {{nr_times}}
        concurrency: {{nr_concurrent}}
      context:
        users:
          tenants: 3
          users_per_tenant: 2
        quotas:
          nova:
            instances: 1000
            cores: -1
            ram: -1
            metadata_items: -1
            injected_files: -1
            injected_file_content_bytes: -1
            injected_file_path_bytes: -1
            key_pairs: 500