Projects / atsar


The atsar command can be used to detect performance bottlenecks on Linux systems. It is similar to the sar command on other UNIX platforms. Atsar has the ability to show what is happening on the system at a given moment. It also keeps track of the past system load by maintaining history files from which information can be extracted. Statistics about the utilization of CPUs, disks and disk partitions, memory and swap, tty's, TCP/IP (v4/v6), NFS, and FTP/HTTP traffic are gathered. Most of the functionality of atsar has been incorporated in the atop project.

Operating Systems

Recent releases

  •  08 Jul 2004 17:15

    Release Notes: This release has support for new/modified counters of the 2.6 kernel. There are some minor bugfixes.

    •  20 Mar 2001 09:33

      Release Notes: Kernel 2.4, IPv6, tty and NFS-server counter support has been added. Parsing of per-partition counters has been modified, and HTTP and FTP counters have been improved.


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