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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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2007-07-08 17:22
7.1.6

New virtual memory paging metrics have been added to sar (option -B). Options -x and -X have been removed from sar (use the pidstat(1) command instead.) NR_CPUS has been increased to 16384 so that sysstat can be used on very large systems. A bug in sadc.c where it was using a hardcoded 256 char buffer to store lines read from /proc/interrupts has been fixed. sar has been updated to avoid overflow when computing some average values.
Tags: Major feature enhancements

2007-06-10 03:29
7.1.5

The -d option was added to pidstat: this option
reports I/O statistics for individual tasks. The
-C option was added to sadc: this option enables
the user to insert a timestamped comment in the
binary data file. The -C option was added to sar:
This option tells sar to display comments inserted
in the binary data file by sadc. A bug that could
happen while reading /proc/interrupts where IRQ
numbers can now be 4 digits long in recent kernels
was fixed. A possible buffer overflow in ioconf.c
was fixed.
Tags: Major feature enhancements

2007-04-29 22:17
7.1.4

The addition of a new command "pidstat" aimed at displaying per-process statistics. The option -N has been added to iostat, which enables the user to query any device-mapper devices for their registered device name (useful for viewing LVM2 statistics). A small memory leak in the readp_uptime() function has been fixed. iostat -t now also takes into account the value of the environment variable S_TIME_FORMAT.
Tags: Major feature enhancements

2007-03-28 10:10
7.1.3

A bug that happened when sar tried to read a datafile created while a least one processor in a hotplug CPU system was disabled was fixed. Support for keeping sar logfiles for more than one month was improved. The new variable "conf_dir" now enables the user to specify a sysstat configuration directory (this variable is used by "configure"). The "--enable-compress-manpg" option was added to "configure" to enable the user to compress manual pages during installation. isag (Interactive System Activity Grapher) was improved.
Tags: Major bugfixes

2007-03-04 17:44
7.1.2

Hotplug CPU support was improved. Now sysstat no
longer assumes that CPU#0 can never be disabled.
Various structures were realigned to save memory
(and disk space). sar -n now displays network
traffic in kilobytes instead of bytes. sysstat now
compiles cleanly with gcc 4.0.2. NLS was updated,
and a Danish translation was added.
Tags: Minor feature enhancements

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