Novaordis-linux: Difference between revisions

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


Example
Example

Latest revision as of 21:38, 2 March 2018

Internal

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 \
       [command] \
       [--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

Metacharacters (Java Regular Expression - Metacharacters) can be specified between single quotes, and escaped:

 java -jar collector.jar --process-regex='-D\[Standalone\]' find
java -jar .collector.jar find --process-regex='java.*-D\[Standalone\].*rest-service-1-bmsqp'

GitHub

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

Maven

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