Agent Resource Usage

The following explains how the Java agent collects CPU, memory, and disk usage. Java's JMX library is basically used. If necessary, you can see how to collect performance metrics through Linux's proc directory or oshi and sigar libraries.

• linux_proc_stat_enabled Boolean

  Default false

  For CPU, memory, and disk usages, set whether or not to collect from the Linux's proc directory.

• oshi_enabled Boolean Java Agent v2.1.0 or later

  Default false

  When measuring the CPU, memory, and disk usages, set whether or not to use the OSHI libraries.

  Note

  It is recommended to use it in the environment with Java 8 or later.

• oshi_netstat_enabled Boolean Java Agent v2.2.31 or later

  Default false

  Set whether or not to collect netstat metrics. The Maximum Transmission Unit (MTU) metric is added.

• sigar_enabled Boolean

  Default false

  The OS data collection through the sigar library is enabled. The OS resource data includes CPU, memory, and disk that are collected every 5 minutes through the sigar library. If the enabled option is false, this is disabled.

  Note

  • In earlier than whatap.agent.2.1.0, the default value is true. In whatap.agent.2.1.0 or later, the default value is false.

  • In Java 8 or earlier or Java 1.6 or earlier, you can enable the sigar library and collect performance metrics by adding the sigar_enabled=true option.

  • Depending on the application environment, you may see CPU metrics displayed as -1. You can check the recommendations provided by WhaTap and then resolve the issues. See the following.