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JSP response time reporting wrong values

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Article ID: 203116

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Updated On:

Products

CA Application Performance Management Agent (APM / Wily / Introscope) CA Application Performance Management (APM / Wily / Introscope) INTROSCOPE DX Application Performance Management

Issue/Introduction

APM Java agent is reporting different values. We are comparing the values what the APM agent is reporting with the values reported by the Tivoli Performance Viewer for the same jsp page.

We reviewed the "Responses Per Interval" and "Average Response Time" for a jsp page. We see values reported for each matric for 15 seconds interval which are 2/3 and 1 respectively.

When we check the Tivoli Performance Viewer for the same jsp page, we see the following values.

ServiceTime showing value of 421 consistently for each 30 second period, and requestcount showing value of 29778 for each 30 second period.

Both requestcount and ServiceTime do not match what the APM investigator is showing for "Average Response Time" and "Responses Per Interval" for the same jsp page.

Environment

Release : 10.5

Component : APM Agents

Resolution


We are able to find following information about the Tivoli Performance Viewer for WAS instances, but it is not clear how these values are being calculated and what they represent. They do not say any time range for the metric value.

https://www.ibm.com/support/knowledgecenter/SSEQTP_8.5.5/com.ibm.websphere.base.doc/ae/rprf_summaryreports.html

https://publib.boulder.ibm.com/httpserv/cookbook/WebSphere_Application_Server-WAS_Traditional-Performance_Monitoring.html

We do agree that both requestcount and ServiceTime do not match what APM investigator is reporting for "Responses Per Interval" and "Average Response Time" for the same jsp page.

Please consult with IBM to understand how the Tivoli Performance Viewer is reporting these values.