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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/ec2-user/data.raw
+ bs: {{bs}}
+ rw: {{rw}}
+ ramp_time: 10
+ host: fio.demo
+ runner:
+ type: Duration
+ duration: 60
+ interval: 60
+
+ {% endfor %}
+ {% endfor %}
+ context
+ ...