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-Task Template Syntax
-====================
-
-Basic template syntax
----------------------
-A nice feature of the input task format used in Yardstick is that it supports
-the template syntax based on Jinja2.
-This turns out to be extremely useful when, say, you have a fixed structure of
-your task but you want to parameterize this task in some way.
-For example, imagine your input task file (task.yaml) runs a set of Ping
-scenarios:
-
-::
-
- # Sample benchmark task config file
- # measure network latency using ping
- schema: "yardstick:task:0.1"
-
- scenarios:
- -
- type: Ping
- options:
- packetsize: 200
- host: athena.demo
- target: ares.demo
-
- runner:
- type: Duration
- duration: 60
- interval: 1
-
- sla:
- max_rtt: 10
- action: monitor
-
- context:
- ...
-
-Let's say you want to run the same set of scenarios with the same runner/
-context/sla, but you want to try another packetsize to compare the performance.
-The most elegant solution is then to turn the packetsize name into a template
-variable:
-
-::
-
- # Sample benchmark task config file
- # measure network latency using ping
-
- schema: "yardstick:task:0.1"
- scenarios:
- -
- type: Ping
- options:
- packetsize: {{packetsize}}
- host: athena.demo
- target: ares.demo
-
- runner:
- type: Duration
- duration: 60
- interval: 1
-
- sla:
- max_rtt: 10
- action: monitor
-
- context:
- ...
-
-and then pass the argument value for {{packetsize}} when starting a task with
-this configuration file.
-Yardstick provides you with different ways to do that:
-
-1.Pass the argument values directly in the command-line interface (with either
-a JSON or YAML dictionary):
-
-::
-
- yardstick task start samples/ping-template.yaml
- --task-args'{"packetsize":"200"}'
-
-2.Refer to a file that specifies the argument values (JSON/YAML):
-
-::
-
- yardstick task start samples/ping-template.yaml --task-args-file args.yaml
-
-Using the default values
-------------------------
-Note that the Jinja2 template syntax allows you to set the default values for
-your parameters.
-With default values set, your task file will work even if you don't
-parameterize it explicitly while starting a task.
-The default values should be set using the {% set ... %} clause (task.yaml).
-For example:
-
-::
-
- # Sample benchmark task config file
- # measure network latency using ping
- schema: "yardstick:task:0.1"
- {% set packetsize = packetsize or "100" %}
- scenarios:
- -
- type: Ping
- options:
- packetsize: {{packetsize}}
- host: athena.demo
- target: ares.demo
-
- runner:
- type: Duration
- duration: 60
- interval: 1
- ...
-
-If you don't pass the value for {{packetsize}} while starting a task, the
-default one will be used.
-
-Advanced templates
-------------------
-
-Yardstick makes it possible to use all the power of Jinja2 template syntax,
-including the mechanism of built-in functions.
-As an example, let us make up a task file that will do a block storage
-performance test.
-The input task file (fio-template.yaml) below uses the Jinja2 for-endfor
-construct to accomplish that:
-
-::
-
- #Test block sizes of 4KB, 8KB, 64KB, 1MB
- #Test 5 workloads: read, write, randwrite, randread, rw
- schema: "yardstick:task:0.1"
-
- scenarios:
- {% for bs in ['4k', '8k', '64k', '1024k' ] %}
- {% for rw in ['read', 'write', 'randwrite', 'randread', 'rw' ] %}
- -
- type: Fio
- options:
- filename: /home/ubuntu/data.raw
- bs: {{bs}}
- rw: {{rw}}
- ramp_time: 10
- host: fio.demo
- runner:
- type: Duration
- duration: 60
- interval: 60
-
- {% endfor %}
- {% endfor %}
- context
- ...