{"id":5075,"date":"2014-05-27T14:27:18","date_gmt":"2014-05-27T12:27:18","guid":{"rendered":"http:\/\/blog.zhaw.ch\/icclab\/?p=5075"},"modified":"2014-07-23T15:49:36","modified_gmt":"2014-07-23T13:49:36","slug":"ceilometer-performance-issues","status":"publish","type":"post","link":"https:\/\/blog.zhaw.ch\/icclab\/ceilometer-performance-issues\/","title":{"rendered":"Ceilometer Performance issues"},"content":{"rendered":"

Update: This does not apply to Icehouse. This flag was to activate an experimental feature \u00a0-this option no longer exists in Icehouse. (It is in Havana, however).<\/em><\/p>\n

There have been some criticisms of the implementation of Ceilometer<\/a> (or Telemetry<\/a> as of Icehouse<\/a>) – however, it’s still the main show in town for understanding what’s going on inside your Openstack.<\/p>\n

We’ve been doing a bit of work with it in multiple projects. In one of our efforts – pulling in energy info via kwapi<\/a> – we noticed that Ceilometer really crawls to a halt with the API giving a response in 20s when trying to enter just a single energy consumption data point. (Yes, it might make more sense to batch these up…). For our simple scenario, this performance was completely unworkable.<\/p>\n

Our Ceilometer installation just used the basic Mirantis Fuel v4.0<\/a> which installed a variant of Havana<\/a>. The db backend was mysql (chosen by Fuel) and we just went with the default configuration parameters.<\/p>\n

There are known performance issues with Ceilometer (issue<\/a>, presentation mentioning it<\/a>, mailing list discussion<\/a>) and it seems that Icehouse has made some significant strides in improving performance of Ceilometer\/Telemetry; however, we have not managed to perform the upgrade as yet – maybe some of these issues have already been fixed.<\/p>\n

For our work, we were able to significantly improve the performance of the Ceilometer API by activating (experimental!) thread pooling on the db: this had the effect of making entering single energy consumption data points take less than one second (down from 20s) and a larger query of the list of available meters took 5s compared to a previous 34s. It just involved setting<\/p>\n

use_tpool=true<\/pre>\n
in \/etc\/ceilometer\/ceilometer.conf<\/code> and bingo – significant uptick in performance (for our small, experimental system).<\/p>\n
Not sure how widely applicable this is, and not sure if it’s realistic for production environments – for our experimental system, it turned an unworkable system into something which is usable (but certainly not speedy!)<\/p>\n
 <\/p>\n
Schlagw\u00f6rter: Ceilometer<\/a>, monitoring<\/a>, openstack<\/a>
<\/div>","protected":false},"excerpt":{"rendered":"
Update: This does not apply to Icehouse. This flag was to activate an experimental feature \u00a0-this option no longer exists in Icehouse. (It is in Havana, however). 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