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Chapter 21.
249
Tuning
This section provides tips on how to improve the performance of your cloud.
21.1. Performance Monitoring
Host and guest performance monitoring is available to end users and administrators. This allows the
user to monitor their utilization of resources and determine when it is appropriate to choose a more
powerful service offering or larger disk.
21.2. Increase Management Server Maximum Memory
If the Management Server is subject to high demand, the default maximum JVM memory allocation
can be insufficient. To increase the memory:
1. Edit the Tomcat configuration file:
/etc/cloud/management/tomcat6.conf
2. Change the command-line parameter -XmxNNNm to a higher value of N.
For example, if the current value is -Xmx128m, change it to -Xmx1024m or higher.
3. To put the new setting into effect, restart the Management Server.
# service cloud-management restart
For more information about memory issues, see "FAQ: Memory" at Tomcat Wiki.
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21.3. Set Database Buffer Pool Size
It is important to provide enough memory space for the MySQL database to cache data and indexes:
1. Edit the Tomcat configuration file:
/etc/my.cnf
2. 2. Insert the following line in the [mysqld] section, below the datadir line. Use a value that is
appropriate for your situation. We recommend setting the buffer pool at 40% of RAM if MySQL is
on the same server as the management server or 70% of RAM if MySQL has a dedicated server.
The following example assumes a dedicated server with 1024M of RAM.
innodb_buffer_pool_size=700M
3. Restart the MySQL service.
# service mysqld restart
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http://wiki.apache.org/tomcat/FAQ/Memory