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sysstat (system statistics) is a collection of performance monitoring tools for Linux. It is available on Unix and Unix-like operating systems. ^[2]

Software included in sysstat package:

• sar(1): Collect, report, or save system activity information. – Linux User Commands Manual
• sa1(8): Collect and store binary data in the system activity daily data file. – Linux Administration and Privileged Commands Manual
• sa2(8): shell variant of sar, supporting the same flags as sar command which write a daily report in the /var/log/sa directory. – Linux Administration and Privileged Commands Manual
• sadf(1): , similar to sar but can write its data in different formats (CSV, XML, etc.). This is useful to load performance data into a database, or import them in a spreadsheet to make graphs.
• iostat(1): reports basic CPU statistics and input/output statistics for devices, partitions and network filesystems. – Linux User Commands Manual
• mpstat(1): reports individual or combined processor related statistics. – Linux User Commands Manual
• pidstat(1): reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc. – Linux User Commands Manual
• nfsiostat(1): reports input/output statistics for network filesystems (NFS). – Linux User Commands Manual
• cifsiostat(1): reports I/O statistics for CIFS resources. – Linux User Commands Manual

• sar (Unix)

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