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sysstat

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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RSS Recent releases

  •  17 Mar 2014 21:32

Release Notes: sar can now take into account a change of CPU count in its data files without losing any data. systemd timer units have been added to replace cronjobs. The nfsiostat command has been renamed nfsiostat-sysstat to avoid confusion with that included in nfs-utils package.

  •  23 Jan 2014 21:20

Release Notes: The pidstat command now includes a new metric giving per-task block I/O delays. A new option has been added to the configure script (--enable-copy-only). sadf now displays the data file creation date.

  •  03 Nov 2013 18:09

Release Notes: A new option (-v) has been added to pidstat, enabling the user to display the number of threads and file descriptors associated with tasks. Several bugs have been fixed in pidstat.

Release Notes: A new metric has been added to sar network devices statistics, giving the utilization percentage of the network interface cards. Several bugs have been fixed all around.

  •  09 Jun 2013 13:39

Release Notes: The sar command can now display filesystems statistics (blocks and inodes utilization) with its new option "-F". Several (small) bugs have also been fixed.

RSS Recent comments

02 Sep 2007 02:40 godard

Re: report sar7.16 problem and attach patch for it
Thanks for this patch. It has been included in sysstat 8.0.0.

02 Aug 2007 00:30 yuyongcong

report sar7.16 problem and attach patch for it
Hello, Mr.Sebastien Godard .

When I used sar7.16,I found a problem.

After adding the parameters "-s 23:59:45 -e 00:00:15",it means sar will read the records at 23:59:45~00:00:15 from sarfile,but

the result is that sar only read the records at 23:59:45-23:59:55 from sarfile,the records after 00:00:00 didn't read from sarfile.

I have made a patch to solve the problem.

To repeat this problem,you could do as following:

Step1:run the script

----------------------------------------------------------------------

#!/bin/sh

DATE=`date +%m%d%H%M%S`

date -s 23:59:45

echo "Now time has been set "`date`

echo "Sar starts to write in sar.$DATE "

sar 5 10 -o ./sar.$DATE

hwclock --hctosys

-----------------------------------------------------------------------

After running,it will create a sarfile.

Step2:read created sarfile

Sar Version: sar 7.16

[root@localhost sysstat-7.1.6]# sar -V

sysstat version 7.1.6

(C) Sebastien Godard (sysstat <at> wanadoo.fr)

[root@localhost sysstat-7.1.6]# sar -f testsar/sar.0810000205

Linux (localhost.localdomain) 08/10/2007

23:59:45 CPU %user %nice %system %iowait %steal %idle

23:59:50 all 4.19 0.00 6.59 0.00 0.00 89.22

23:59:55 all 8.02 0.20 11.42 0.00 0.00 80.36

00:00:00 all 5.59 0.00 9.58 0.00 0.00 84.83

00:00:05 all 4.60 0.40 6.60 0.00 0.00 88.40

00:00:10 all 4.61 0.00 6.61 0.00 0.00 88.78

00:00:15 all 3.99 0.20 9.58 2.20 0.00 84.03

00:00:20 all 4.80 0.20 8.20 0.60 0.00 86.20

00:00:25 all 4.39 0.20 6.39 0.00 0.00 89.02

00:00:30 all 4.21 0.00 7.62 0.00 0.00 88.18

00:00:35 all 4.39 0.20 7.39 0.20 0.00 87.82

00:00:40 all 4.20 0.20 7.40 0.00 0.00 88.20

00:00:45 all 7.80 0.00 9.20 1.00 0.00 82.00

Average: all 5.06 0.13 8.05 0.33 0.00 86.42

Created sarfile starts with 23:59:45 ends with 00:00:45

Step3:Problem turn out

[root@localhost sysstat-7.1.6]# sar -f testsar/sar.0810000205 -s 23:59:45 -e 00:00:15

Linux (localhost.localdomain) 08/10/2007

The bug can be fixed with the following patch:

Signed-off-by: "Yu Yongcong" <yuyc@cn.fujitsu.com>

--- sysstat-7.1.6/sar.c.orig 2007-08-14 08:09:28.000000000 +0800

+++ sysstat-7.1.6/sar.c 2007-08-14 10:13:47.000000000 +0800

@@ -840,6 +840,13 @@

set_timestamp(!curr, cur_time[!curr], 16);

/* Set current timestamp */

set_timestamp(curr, cur_time[curr], 16);

+

+ if (tm_start.use && file_stats[!curr].ust_time

+ && (file_stats[curr].ust_time > file_stats[!curr].ust_time)

+ && (file_stats[curr].hour < file_stats[!curr].hour)) {

+ file_stats[curr].hour += 24;

+ rectime.tm_hour += 24;

+ }

/* Check time (2) */

if (use_tm_start && (datecmp(&rectime, &tm_start) < 0))

@@ -1622,6 +1629,9 @@

((interval < 0) && !from_file[0] && !to_file[0]))

set_default_file(&rectime, from_file);

+ if (tm_start.use && tm_end.use && (tm_end.tm_hour < tm_start.tm_hour))

+ tm_end.tm_hour += 24;

+

/*

* Check option dependencies

*/

Here is the output after the fix:

[root@localhost sysstat-7.1.6]#sar -f testsar/sar.0810000205 -s 23:59:45 -e 00:00:15

Linux (localhost.localdomain) 08/10/2007

23:59:45 CPU %user %nice %system %iowait %steal %idle

23:59:50 all 4.19 0.00 6.59 0.00 0.00 89.22

23:59:55 all 8.02 0.20 11.42 0.00 0.00 80.36

00:00:00 all 5.59 0.00 9.58 0.00 0.00 84.83

00:00:05 all 4.60 0.40 6.60 0.00 0.00 88.40

00:00:10 all 4.61 0.00 6.61 0.00 0.00 88.78

00:00:15 all 3.99 0.20 9.58 2.20 0.00 84.03

Average: all 5.16 0.13 8.40 0.37 0.00 85.94

That's all.

Best Regards.

28 Dec 2004 13:18 godard

Re: fix for spec file
OK: spec file updated with sysstat 5.1.4.

17 Dec 2004 13:30 godard

Re: compile errors on 2.6

> Hey, just tried to do an rpmbuild

> --rebuild on 5.1.3

>

> noticed that the build failed because

> MAX_BLKDEV isn't defined for 2.6

> kernels, for some reason it was removed

> from major.h.

Yes: MAX_BLKDEV was removed from linux/major.h in 2.6 kernels. Sysstat 5.1.4 has been updated to take this into account.

17 Dec 2004 13:26 godard

Re: after all that, sar doesn't work

> pseries-loaner:/usr/src/packages/SOURCES/sysstat-5.1.3

> # ./sar -u 2 5

> exec: No such file or directory

>

This is because sar tries to launch its data collector (sadc) and doesn't find it. Enter "make install" after compiling to install each component in its directory before using sar.

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