Monitor System

sysstat – collection of performance monitoring utilities

The sysstat utilities are a collection of open source performance monitoring tools for Linux.

The utilities include mpstat, iostat, nfsiostat-sysstat, cifsiostat, pidstat, sar, sadc, sadf and sa tools.

Many programs available on the internet use sysstat’s data to make graphs (one of them, isag, is included in sysstat).

  • iostat – reports CPU statistics and input/output statistics for devices, partitions and network filesystems.
  • mpstat – reports individual or combined processor related statistics.
  • pidstat – reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc.
  • sar – collects, reports and saves system activity information (CPU, memory, disks, interrupts, network interfaces, TTY, kernel tables, etc).
  • sadc – is the system activity data collector, used as a backend for sar.
  • sa1 – collects and stores binary data in the system activity daily data file. It is a front end to sadc designed to be run from cron.
  • sa2 – writes a summarized daily activity report. It is a front end to sar designed to be run from cron.
  • sadf – displays data collected by sar in multiple formats (CSV, XML, etc.) This is useful to load performance data into a database, or import them in a spreadsheet to make graphs.
  • nfsiostat-sysstat – reports input/output statistics for network filesystems (NFS).
  • cifsiostat – reports CIFS statistics.

Features include:

  • Monitor:
    • Input / Output and transfer rate statistics (global, per device, per partition, per network filesystem and per Linux task / PID).
    • CPU statistics (global, per CPU and per Linux task / PID), including support for virtualization architectures.
    • Memory, hugepages and swap space utilization statistics.
    • Virtual memory, paging and fault statistics.
    • Per-task (per-PID) memory and page fault statistics.
    • Global CPU and page fault statistics for tasks and all their children.
    • Process creation activity.
    • Interrupt statistics (global, per CPU and per interrupt, including potential APIC interrupt sources, hardware and software interrupts).
    • Extensive network statistics: network interface activity (number of packets and kB received and transmitted per second, etc.) including failures from network devices; network traffic statistics for IP, TCP, ICMP and UDP protocols based on SNMPv2 standards; support for IPv6-related protocols.
    • NFS server and client activity.
    • Socket statistics.
    • Run queue and system load statistics.
    • Kernel internal tables utilization statistics.
    • System and per Linux task switching activity.
    • Swapping statistics.
    • TTY device activity.
    • Power management statistics (instantaneous and average CPU clock frequency, fans speed, devices temperature, voltage inputs, USB devices plugged into the system)
    • Filesystems utilization (inodes and blocks).
  • Average statistics values are calculated over the sampling period.
  • Most system statistics can be saved in a file for future inspection.
  • Allows to configure the length of data history to keep.
  • On the fly detection of new devices (disks, network interfaces, etc.) that are created or registered dynamically.
  • Support for UP and SMP machines, including machines with hyperthreaded or multi-core processors.
  • Support for hotplug CPUs (it detects automagically processors that are disabled or enabled on the fly) and tickless CPUs.
  • Works on many different architectures, whether 32- or 64-bit.
  • Needs very little CPU time to run (written in C).
  • System statistics can be exported in various different formats (CSV, XML, JSON, etc.). DTD and XML Schema documents are included in sysstat package.
  • Internationalization support.

Developer: Sebastien Godard
License: GNU General Public License v2.0


sysstat is written in C. Learn C with our recommended free books and free tutorials.

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