123 lines
4.4 KiB
ReStructuredText
123 lines
4.4 KiB
ReStructuredText
..
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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================
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OSprofiler Guide
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================
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OSprofiler is a library from oslo. It's used for performance analysis. Please
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see `Office Doc`_ for more detail.
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Preparation
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-----------
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OSprofiler now supports some kind of backends, such as Ceilometer, ElasticSearch
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, Messaging and MongoDB.
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.. note:: 1. Ceilometer is only used for data collection, and Messaging is only
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used for data transfer. So Ceilometer only works when Messaging is enabled.
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2. ElasticSearch and MongoDB support both data collection and transfer. So
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they can be used standalone.
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In this guide, we take MongoDB for example.
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There are some new config options.
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**enabled**
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Enables the profiling for all services on this node. Default value is False
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(fully disable the profiling feature). This function may bring down Zaqar's
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performance, so please set to disable in production environment.
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**connection_string**
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Connection string for a notifier backend. Default value is messaging:// which
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sets the notifier to oslo_messaging. Here we set it to "mongodb://localhost:27017"
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**hmac_keys**
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Secret key(s) to use for encrypting context data for performance profiling.
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This string value should have the following format: <key1>[,<key2>,...<keyn>],
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where each key is some random string. A user who triggers the profiling via
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the REST API has to set one of these keys in the headers of the REST API call
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to include profiling results of this node for this particular project.
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**trace_wsgi_transport**, **trace_message_store** and **trace_management_store**
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The three layers during a user's request flow. Set to True to enable tracing
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for each layer.
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So In this example, we should add the following config options::
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[profiler]
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enabled = True
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connection_string = mongodb://localhost:27017
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hmac_keys = 123
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trace_wsgi_transport = True
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trace_message_store = True
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trace_management_store = True
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.. note:: If you want to use MQ and Ceilometer, please leave the
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**connection_string** empty or indicate the MQ information. And please make
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sure that the following config options have be set in Ceiolmeter.conf
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::
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[DEFAULT]
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event_dispatchers = database
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[oslo_messaging_notifications]
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topics = notifications, profiler
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Then restart Zaqar service
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Command Line
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------------
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we can use OpenStack Client to analyse the user request now. For example, if we
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want know the performance for "queue list", we can do like this:
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1. OpenStack Client now supports OSprofiler by default. Only thing we need to
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do is adding ``--os-profile {hmac_keys}`` in the command::
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openstack queue list --os-profile 123
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"123" here is what we set in Zaqar config file. After the request is done,
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OpenStack Client will return a trace ID like::
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Trace ID: 2902c7a3-ee18-4b08-aae7-4e34388f9352
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Display trace with command:
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osprofiler trace show --html 2902c7a3-ee18-4b08-aae7-4e34388f9352
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Now the trace information has been stored in MongoDB already.
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2. Use the command from the openstack client return information. The osprofiler
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command uses Ceilometer for data collection by default, so we need use
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``--connection-string`` to change it to mongoDB here::
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osprofiler trace show --html 2902c7a3-ee18-4b08-aae7-4e34388f9352 --connection-string mongodb://localhost:27017
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Then you can see the analysis information in html format now.
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It also supports json format::
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osprofiler trace show --json 2902c7a3-ee18-4b08-aae7-4e34388f9352 --connection-string mongodb://localhost:27017
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Of cause it supports to save the result to a file::
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osprofiler trace show --json 2902c7a3-ee18-4b08-aae7-4e34388f9352 --out list_test --connection-string mongodb://localhost:27017
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Then you can open the file "list_test" to get the result.
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.. note:: If you used MQ for data transfer, the "--connection-string" here
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could be ignored or set it to your Ceilometer endpoint.
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.. _Office Doc: http://docs.openstack.org/developer/osprofiler/background.html
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