Performance servlet (PerfServlet)

 

Before you begin

The PerfServlet is used for simple end-to-end retrieval of performance data that any tool, provided by either IBM or a third-party vendor, can handle. The servlet provides a way to use an HTTP request to query the performance metrics for an entire WAS administrative domain. Because the servlet provides the performance data through HTTP, issues such as firewalls are trivial to resolve.

The PerfServlet provides the performance data output as an XML document, as described in the provided document type description (DTD). In the XML structure, the leaves of the structure provide the actual observations of performance data and the paths to the leaves that provide the context.

The PerfServlet 6.0 uses the JMX Perf MBean interface to retrieve the PMI data and outputs an XML document that uses the J2EE 1.4 Performance Data Framework to describe the statistics. The PerfSerlvet in V6.0 can also provide an output that is compatible with the PerfServlet 5.0. To provide PerfServlet 5.0 compatible output it uses the PMI client interface.

The performance servlet .ear file PerfServletApp.ear is located in the WAS_HOME/installableApps directory.

 

Overview

The performance servlet is deployed exactly as any other servlet. To use it, follow these steps:

 

Procedure

1. Deploy the servlet on a single application server instance within the domain.

2. After the servlet deploys, one can invoke it to retrieve performance data for the entire domain. Invoke the performance servlet by accessing the following default URL

   http://hostname/wasPerfTool/servlet/perfservlet
   

 

Result

The performance servlet provides performance data output as an XML document, as described by the provided document type definition (DTD). The DTD is located inside the PerfServletApp.ear file.

 

See also

PerfServlet input
PerfServlet output

 

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