Gem for collecting memcached, disk, cpu and IO statistics. Collected stats are sent to the New Relic RPM application.
Memcached statistics sampler collects subset of stats provided by memcached daemon. In addition it computes other stats dervied from memcached stats. Also support stats derivatives over time to compute rate etc. Specify Memcached nodes configuration in memcached-nodes.txt file under the IA agent directory
Use this gem to collect statistics from a given host by running newrelic_ia -a as a daemon. This will contribute System/* metrics to your RPM console which can be viewed with custom dashboards.
newrelic_ia [ options ] aspect, aspect..
aspect: one or more of 'iostat' or 'disk' or 'memcached' (more to come)
-a, --all use all available aspects
-v, --verbose debug output
-q, --quiet quiet output
-e, --environment=ENV use ENV section in newrelic.yml
--install create a default newrelic.yml
-h, --help Show this help message.
-
New Relic Agent version 2.9.2 or later
-
Gold Subscription for creating and viewing custom dashboards
sudo gem install newrelic_ia
Once installed, run from the home directory of your Rails application, or create a separate working directory and run
newrelic_ia --install
to create a template newrelic.yml file you can use. Edit this file and substitute your license key and app_name value.
specify memcached nodes in memcached-nodes.txt.
Memcached stats are reported for each node and also sample reports aggregated stats
Stats provided by memcached daemon
uptime Number of seconds this server has been running
curr_items Current number of items stored by the server
total_items Total number of items stored by this server
ever since it started
bytes Current number of bytes used by this server
to store items
curr_connections Number of open connections
total_connections Total number of connections opened since
the server started running
connection_structures Number of connection structures allocated
by the server
cmd_get Cumulative number of retrieval requests
cmd_set Cumulative number of storage requests
get_hits Number of keys that have been requested and
found present
get_misses Number of items that have been requested
and not found
evictions Number of valid items removed from cache
to free memory for new items
bytes_read Total number of bytes read by this server
from network
bytes_written Total number of bytes sent by this server to
network
limit_maxbytes Number of bytes this server is allowed to
use for storage.
threads Number of worker threads requested.
(see doc/threads.txt)
Derived Stats (computed stats)
free_maxbytes Number of free bytes this server has available for storage
Stats Derivatives (time derivatives of stats)
hit_ratio Percent of keys that have been requested and
found present
miss_ratio Percent of keys that have been requested and
found missing
rpm Requests per minutes gpm Gets per minutes hpm Hits per minutes mpm Misses per minutes spm Sets per minutes fpm Flushes per minutes epm Evictions per minutes
Liquid template for NewRelic custom dashboard
<div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Miss Ratio' metric:'/System/MemcachedAgg/Miss Ratio' simple_tooltip:true label:segment_3 value_suffix:'%' %}
</div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Memory' regexp:'/System/MemcachedAgg/(Bytes|Free Bytes|Limit Maxbytes)' simple_tooltip:true label:segment_3 %}
</div>
<br style="clear: both" />
</div>
<div style="padding-top: 20px"> </div>
<div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Gets & Sets' regexp:'/System/MemcachedAgg/(Gpm|Spm)' simple_tooltip:true label:segment_3 %}
</div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Misses, Flushes, & Evictions' regexp:'/System/MemcachedAgg/(Mpm|Epm|Fpm)' simple_tooltip:true label:segment_3 %}
</div>
<br style="clear: both" />
</div>
<div style="padding-top: 20px"> </div>
<div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Active Connections' metric:'/System/MemcachedAgg/Curr Connections' simple_tooltip:true hide_legend:true %}
</div>
<div style="float: left; width: 50%;">
{% line_chart value:average_value title:'Cache Objects' metric:'/System/MemcachedAgg/Curr Items' simple_tooltip:true hide_legend:true %}
</div>
<br style="clear: both" />
</div>
(The MIT License)
Copyright © 2009-2010 Bill Kayser, Chandra Patni, Tony Ford
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.