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Foglight 6.1.0 - Performance Tuning Field Guide

Table of Contents

Characteristics of Poor Performance in Foglight Parameters that Affect Foglight Performance Critical Areas that Can Affect Foglight Performance Identifying Performance Problems

Hardware and Operating System Tuning

Running on Virtual Hardware

Performance Challenges CPU

Ready Time

Diagnostic Snapshot

Management Server Tuning

Dashboard Default Timeout

Java Virtual Machine Tuning

Getting Started Foglight JVM Configuration

-XX:+UseConcMarkSweepGC -Xmx and -Xms -XX:NewSize, -XX:MaxNewSize, and -XX:NewRatio -XX:MaxPermSize -Xss

Common Symptoms and Tuning Resolutions

Backend Database Tuning

Initial Database Configuration Settings

Monitoring and Managing Database Size Backup and Recovery Recommendations init.ora Configuration

Sample init.ora:

Database Maintenance Recommendations

Case

How the Management Server Uses the Database Index Management Memory Block Size Oracle Striping Oracle Tablespaces

Undo tablespace Custom Tablespaces

Microsoft SQL Server Tuning PostgreSQL Tuning Troubleshooting

Management Server Load Preventing Database Connections

High Availability (HA) Tuning

Tuning Connection Issues in an HA Implementation Managing Hosts with Multiple Network Interfaces JDK with IPv6 on Linux Management Server Automatically Restarted Other JGroup Related Issues and Information

Topology Changes and Topology Churn Canonical Data Transformations (CDTs) Agent Weight / Environment Complexity Large Topologies Sampling Frequency XML-HTTP Agent Adapter Dropped Agent Manager Log Messages Java EE Technologies

Appendix: Performance Health Check

Is the Server Getting the Right Amount of Memory?

Management Server Memory is Healthy if ... Management Server Memory Checks Possible Actions

Is the Server Getting Enough CPU?

Management Server CPU is Healthy if ... Management Server CPU Checks Extended Browser Interface Checks Possible Actions

Is the Database too Slow?

The Database is Healthy if ... Database Checks Possible Actions

Is the Database Growth Reasonable?

Database Growth is Healthy if ... Database Checks Possible Actions

Is There Too Much Data to Process?

Data Volume is Healthy if ... Data Volume Checks Possible Actions

Is the Model Stable?

The Model is Healthy if ... Model Checks Possible Actions

Are Too Many Alarms Firing?

The Number of Alarms is in a Healthy State if... Alarms Checks Possible Actions

Is the Business Logic Properly Tuned?

Business Logic is Healthy if... Business Logic Checks Possible Actions

Are There Too Many User Requests?

User Activity Is Healthy If... Possible Actions

Appendix: Analyzing a Support Bundle

Topology Sync Topology Limits

Diagnostic Snapshot

Memory Consumption Threads, Deadlocks, and Overall CPU Usage Useful Information ---- jboss.system:type=ServerInfo ---- jboss.jca:service=ManagedConnectionPool,name=jdbc/nitrogen ---- jboss.web:type=RequestProcessor,* ---- com.quest.nitro:service=Derivation

Derivation Related Issues

---- com.quest.nitro:service=Topology

Topology Related Issues

---- com.quest.nitro:service=DataCacheEviction

Analyzing a Performance Report

Server Rule Information System-wide Topology Changes JVM Memory Usage Management Server Garbage Collectors JDBC Connection Pool Derivation Rulette

Sampling Frequency

All converted Foglight® 4 agents have a secondary ASP (usually called SamplingFreq) that controls data collection frequencies.

To access that ASP, select an agent in the Administration module of the browser interface and then choose Edit Properties.

XML-HTTP Agent Adapter

The XML-HTTP Agent Adapter enables agents to post data in XML format over HTTP(S).

By default this adapter is configured to reject posted XML text larger than 20MB.

Table 4. XML-HTTP Agent Adapter
Motivation	The XML-HTTP agent adapter rejects large XML submissions to protect the server from memory overload.
Symptom	An agent that uses the XML-HTTP protocol complains that the server is rejecting its data.
Diagnosis/Verification	Check the agent logs for specific error messages indicating that the data was rejected due to size constraints.
Tuning	Open web.xml, which is located in <foglight_home>/cartridge/XmlHttpAgentAdapter-*.car, component XmlHttpAgentAdapter-5_2_4\WebApp-\foglight-xml-agent-adapter.war, file WEB-INF\web.xml, and adjust the maxContentLength parameter.
Note 1	You will need to unzip the .car file, then unzip the .war file, edit the web.xml file, and then re-package the cartridge manually (using zip).
Note 2	After you modify the cartridge, you will have to delete <foglight_home>\state\cartridge.exploded\XmlHttpAgentAdapter-*, and then restart the Management Server.

Dropped Agent Manager Log Messages

The default settings for the Foglight® Agent Manager are configured to impact the system as little as possible. However some agents put additional load on the system, which results in dropped log messages such as the following:

2010-11-29 17:03:56.816 VERBOSE Upstream Polling-0 com.quest.glue.core.comms.transport.http.Client - Upstream message exchange took 100,525 ms which is close to or above the maximum polling interval of 10,000 ms. Batch size has been decreased to 162.

2010-11-29 17:12:03.376 WARN CachedOutgoingQueueWorker com.quest.glue.common.comms.CachedOutgoingQueue - Removed 253 messages because the message queue is full.

To resolve this issue, increase the message cache size (that is, the max-disk-space setting in the <FglAM_home>/state/default/config/fglam.config.xml file).

Java EE Technologies

The configuration of the Cartridge for Java EE Technologies agent has the potential to significantly influence Foglight performance.

For information about configuring the Cartridge for Java EE Technologies, see the Foglight® for Java EE Technologies documentation.

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