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authorAna C <ana.cunha@ericsson.com>2016-02-10 19:07:13 +0100
committerAna C <ana.cunha@ericsson.com>2016-02-11 09:39:59 +0100
commit702eebbf78b29fb9046436dd71575b4f210f4731 (patch)
treee7ef6278850111d67e414a44561066ec00061331 /docs/userguide/Yardstick_task_templates.rst
parentfd3dd37a734a741a823962dbc646480ece70b3bb (diff)
Add license info and update structure
This change adds license to all .rst files under userguide. It also combines all configguide files into user guide. New reference.rst with list of links. Updated glossary, removed separate directories for apexlake and yardstick framework. Change-Id: I6532ed073905b0fa85a17e759ea7dc3c24acb91f Signed-off-by: Ana C <ana.cunha@ericsson.com>
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+.. This work is licensed under a Creative Commons Attribution 4.0 International
+.. License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) OPNFV, Huawei Technologies Co.,Ltd and others.
+
+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
+ ...