Novaordis-linux

Internal

• Projects
• Per-Process CPU Runtime Statistics

Overview

Linux monitoring and management functionality:

• /proc/stat parsing.
• a collector that can read arbitrary files at high rate and cache them in memory - useful for sampling individual processes.

Statistics Collector

The library includes a CPU statistics collector (/proc/stat, proc/<pid>/stat, etc.) that periodically reads O/S level statistics for the entire system and for a process specified via a regular expression, and displays those statistics at stdout or writes them in a file. To stop the collection, Ctrl-C.

Usage:

   java -jar collector.jar [--output-file=/tmp/cpu.csv] [--process-regex='<regex>'] [--sampling-interval-ms=10]

Example

   java -jar collector.jar --process-regex=' -server ' --sampling-interval-ms=50

It is possible to test the regular expression to make sure it correctly selects the process without collecting any statistics:

   java -jar collector.jar --process-regex='...' find

For more details on the Java regular expression syntax, see:

Java Regular Expression - Metacharacters

GitHub

https://github.com/NovaOrdis/novaordis-linux

Maven

<dependency>
    <groupId>io.novaordis.linux</groupId>
    <artifactId>novaordis-linux</artifactId>
    <version>${novaordis.linux.version}</version>
</dependency>