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The sysstat package contains the sar, sadf, iostat, nfsiostat, cifsiostat, mpstat, and pidstat commands for Linux. The sar command collects and reports system activity information. The statistics reported by sar concern I/O transfer rates, paging activity, process-related activites, interrupts, network activity, memory and swap space utilization, CPU utilization, kernel activities, and TTY statistics, among others. The sadf command may be used to display data collected by sar in various formats. The iostat command reports CPU statistics and I/O statistics for tty devices and disks. The pidstat command reports statistics for Linux processes. The mpstat command reports global and per-processor statistics. The nfsiostat command reports I/O statistics for network filesystems. The cifsiostat command reports I/O statistics for CIFS filesystems.

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2008-07-15 02:48
8.1.5

Virtual machine time accounting has been added to "sar -u ALL" and mpstat (%guest). pidstat has also been updated to be able to display time spent by a task in a virtual machine. The option -S has been added to sar, which tells sar to display swap space utilization. "%swpcad" has been added to sar -S (percentage of cached swap memory in relation to the amount of used swap space). "kbcommit" and "%commit" have been added to sar -r (amount and percentage of memory needed for current workload). iostat now displays the total number of operations per second in the NFS report.
Tags: Major feature enhancements

2008-06-22 08:49
8.1.4

sar can now collect and display all CPU fields
with its new option "-u ALL". mpstat can now
display per-CPU interrupts statistics. mpstat now
uses a separate option ("-I SUM") to display the
total number of interrupts for each processor. NFS
v4 support was added to "sar -n NFS(D)".
Tags: Minor feature enhancements

2008-05-25 21:20
8.1.3

A major rewrite was done to sysstat. The sar, sadc
and sadf commands have been heavily modified. It
is now easier to add (or remove) activities, since
these commands have been rewritten in a
non-monolithic way with a generic design
architecture.
Tags: Code cleanup

2008-03-16 14:09
8.1.2

Iostat displays read and write operations per
second in the NFS report. Sadc now retries to
write its buffers when the write() call has been
interrupted by a signal. The -h option has been
added to sadf: used with the -d or -D options, it
indicates that all activities should be displayed
horizontally on a single line of data. Sadf -d and
sadf -D now display the list of fields for easier
data reading. NLS has been updated, adding a
Chinese (Simplified) translation.
Tags: Minor feature enhancements

2008-02-10 22:58
8.1.1

System activity data files have extra header data that enables you to identify which version of sysstat created them. Machine architecture is displayed in the reports header. The number of processors was not properly calculated on machines where a directory named cpuidle was present in the /sys/devices/system/cpu directory [Gentoo bug# 207886]. __CPU_SETSIZE definition from sched.h is used instead of a static definition for the maximum number of CPUs (NR_CPUS). Error messages displayed by sysstat's commands have been improved. NLS has been updated, adding a Finnish translation.
Tags: Minor feature enhancements

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