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README.md
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### sysstat - System performance tools for the Linux operating system
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### Introduction
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The sysstat package contains various utilities, common to many commercial Unixes, to monitor system performance and usage activity:
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- iostat reports CPU statistics and input/output statistics for block devices and partitions.
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- mpstat reports individual or combined processor related statistics.
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- pidstat reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc.
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- tapestat reports statistics for tape drives connected to the system.
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- cifsiostat reports CIFS statistics.
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Sysstat also contains tools you can schedule via cron or systemd to collect and historize performance and activity data:
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- sar collects, reports and saves system activity information (see below a list of metrics collected by sar).
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- sadc is the system activity data collector, used as a backend for sar.
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- 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 or systemd.
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- sa2 writes a summarized daily activity report. It is a front end to sar designed to be run from cron or systemd.
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- sadf displays data collected by sar in multiple formats (CSV, XML, JSON, etc.) and can be used for data exchange with other programs. This command can
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also be used to draw graphs for the various activities collected by sar using SVG (Scalable Vector Graphics) format.
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Default sampling interval is 10 minutes but this can be changed of course (it can be as small as 1 second).
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### System statistics collected by sar:
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- Input / Output and transfer rate statistics (global, per device, per partition and per network filesystem)
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- CPU statistics (global and per CPU), including support for virtualization architectures
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- Memory, hugepages and swap space utilization statistics
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- Virtual memory, paging and fault statistics
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- Process creation activity
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- Interrupt statistics (global, per CPU and per interrupt, including potential APIC interrupt sources, hardware and software interrupts)
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- Extensive network statistics: network interface activity (number of packets and kB received and transmitted per second, etc.) including failures
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from network devices; network traffic statistics for IP, TCP, ICMP and UDP protocols based on SNMPv2 standards; support for IPv6-related protocols
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- Fibre Channel traffic statistics
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- Software-based network processing (softnet) statistics
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- NFS server and client activity
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- Sockets statistics
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- Run queue and system load statistics
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- Kernel internal tables utilization statistics
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- Swapping statistics
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- TTY devices activity
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- Power management statistics (instantaneous and average CPU clock frequency, fans speed, devices temperature, voltage inputs)
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- USB devices plugged into the system
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- Filesystems utilization (inodes and blocks)
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- Pressure-Stall Information statistics
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### Sysstat key features:
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- Display average statistics values at the end of the reports.
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- On-the-fly detection of new devices (disks, network interfaces, etc.) that are created or registered dynamically.
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- Support for UP and SMP machines, including machines with hyperthreaded or multi-core processors.
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- Support for hotplug CPUs (it detects automagically processors that are disabled or enabled on the fly) and tickless CPUs.
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- Works on many different architectures, whether 32- or 64-bit.
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- Needs very little CPU time to run (written in C).
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- System statistics collected by sar/sadc can be saved in a file for future inspection. You can configure the length of data history to keep.
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There is no limit for this history length but the available space on your storage device.
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- System statistics collected by sar/sadc can be exported in various different formats (CSV, XML, JSON, SVG, etc.). DTD and XML Schema documents
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are included in sysstat package. JSON output format is also available for mpstat and iostat commands.
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- iostat can display statistics for devices managed by drivers in userspace like spdk.
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- Smart color output for easier statistics reading.
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Sysstat is Open Source / Free Software, and is freely available under the GNU General Public License, version 2. The latest version of sysstat
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can always be found on the web site at:
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http://pagesperso-orange.fr/sebastien.godard/
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See the CHANGES file to know the new features/improvements/bug fixes added in this release of sysstat. Sysstat development can be tracked on the
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web site at: https://github.com/sysstat/sysstat
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### Installation
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### Install from openEuler
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Enter:
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$ sudo yum install sysstat
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openEuler is a newer system. You may need to enable and start the sysstat service:
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$ sudo systemctl enable sysstat
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$ sudo systemctl start sysstat
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### Install from Ubuntu
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Enter:
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$ sudo apt-get install sysstat
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Then enable data collecting:
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$ sudo vi /etc/default/sysstat
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change ENABLED="false" to ENABLED="true"
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save the file
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Last, restart the sysstat service:
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$ sudo service sysstat restart
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### Install from sources
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Clone sysstat public repository with:
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$ git clone git://github.com/sysstat/sysstat
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Then configure sysstat for your system:
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$ cd sysstat
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$ ./configure
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You can set several variables and parameters on the command line. For example you can enter the following option to activate data
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collecting (either using cron or systemd):
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$ ./configure --enable-install-cron
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Enter:
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./configure --help to display all possible options.
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Note: There is another way to configure sysstat instead of entering ./configure: This is the Interactive Configuration script (iconfig) which will
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ask you for the value of the main sysstat variables and parameters. Enter ./iconfig then answer the questions or enter Return to accept the (sane)
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default values. For yes/no questions, answer 'y' or 'n' (without the quotes): It is case sensitive! You can also enter '?' to get a help message
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that will explain the meaning of each variable or parameter.
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Compile and install:
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$ make
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$ sudo make install
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### Support sysstat!
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If you are reading this README file then you are probably about to use the sysstat tools to help you monitor your system and maybe troubleshoot
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some performance issues. Good choice. Sysstat is made for you. Moreover sysstat is free software and always will be.
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