You can configure the Runtime Performance Advisor using the wsadmin
tool or the administrative console.
About this task
The Runtime Performance Advisor tool provides advice to help tune
systems for optimal performance. See the Using
the Runtime Performance Advisor article for
more information on how to enable this tool using the administrative console.
The recommendations display as text in the SystemOut.log file.
The
Runtime Performance Advisor (RPA) requires that the Performance Monitoring
Service (PMI) is enabled. It does not require that individual counters be
enabled. When a counter that is needed by the RPA is not enabled, the RPAr
will enable it automatically.
There is no MBean/object available for
wsadmin to create a RPA configuration. You can use wsadmin to change the settings
and make them effective at runtime. These changes will not be persisted. The
changes remain until you stop the server. Since the RPA is disabled once you
stop the server, you may want to disable the PMI Service or the counters that
were enabled while it was active. You can enable the following counters using
the Runtime Performance Advisor:
ThreadPools (module)
Web Container (module)
Pool Size
Active Threads
Object Request Broker (module)
Pool Size
Active Threads
JDBC Connection Pools (module)
Pool Size
Percent used
Prepared Statement Discards
Servlet Session Manager (module)
External Read Size
External Write Size
External Read Time
External Write Time
No Room For New Session
System Data (module)
CPU Utilization
Free Memory
The following provides an explanation for some of
the settings that you can use:
- Calculation interval PMI data - This setting is taken over an interval
of time and averaged to provide advice. The calculation interval specifies
the length of the time over which data is taken for this advice. Details within
the advice messages will appear as averages over this interval.
- Maximum warning sequence - This setting refers to the number of consecutive
warnings issued before the threshold is relaxed. For example, if the maximum
warning sequence is set to 3, then the advisor only sends three warnings to
indicate that the prepared statement cache is overflowing. After that, a new
alert is only issued if the rate of discards exceeds the new threshold setting.
- Number of processors - This setting specifies the number of processors
on the server. It is critical in order to ensure accurate advice for the specific
configuration of the system.
To enable the Runtime Performance Advisor tool using the wsadmin
tool, perform the following steps: