Added CPU average clock frequency statistics to sar and sadc.
This patch adds a new option to sar (-m FREQ) that displays
the following field: wghMHz.
For this option to work, the cpufreq-stats driver must be compiled
in the kernel, as we need to read the "time-in-state" file in /sys.
sadc and sadf have also been updated to take into account this new field.
DTD and XSD documents have been updated.
The sar manual page has been updated.
Mail from Zhen Zhang (08/09/2010) <furykerry@gmail.com>
Hi ,
The current stable and development systat collect cpu frequency data
from /proc/cpuinfo, but currently cpuinfo "cpu Mhz" field report the
instant cpu frequency . From a system administrator point of view
however ,the preferred metric is the average cpu frequency at
reporting interval . The average frequency can be obtain from
/sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state.
Will the sysstat switch to average cpu frequency at next development version?
Thanks
Mail from Zhen Zhang (11/09/2010) <furykerry@gmail.com>
I want to measure the average cpu frequency of a machine which
probably is capable of dynamic adjusting frequency (DVFS). The average
of cpu frequency is an important metric to evaluate the power
consumption of a machine, and how hard the machine is working to serve
the requests. DVFS capability is starting to get wide adoption in the
server domain e.g. in recent Xeon.
The /proc/cpuinfo interface only record the instant cpu frequency
,however linux kernel or user frequncy governor can adjust cpu
frequency frequently , e.g. for default ondemand governor the
frequency is 10ms . Such interval is way to small comparing to usual
sysstat interval e.g 5min. So an accumulated value is needed .
cpufreq-stats is a driver ( It seems had entered into kernel 2.6.11,
and its document is available at kernel 2.6.12,
http://lxr.linux.no/#linux+v2.6.12/Documentation/cpu-freq/cpufreq-stats.txt).
For recent ubuntu , cpufreq-stats and cpufreq driver is built into
kernel. The average frequency can be fetch as follow
:/sys/devices/system/cpu/cpu0/cpufreq/stats$ cat time_in_state
2001000 60803
2000000 5734
1600000 5996
1200000 8819
800000 205211
each line define a pair of frequency and its accumulated ticks since
reboot. sysstat can sample it and take the difference as the
accumulated ticks at the sampling interval , and calculated weighted
average cpu frequency.
The cpufreq-stats do have some pitfall which is addressed in patch
https://patchwork.kernel.org/patch/72488/).
Nevertheless its current form is already quite useful, I suggest
sysstat to utilize if available , and fall back to /proc/cpuinfo if
not.
Hopes to hear good news:)
thanks
Added a new magical value for each activity in file.
A format change can now hit only one activity instead of the whole file.
Sadf has also been updated to be able to display activities with
unknown format (sadf -H).
Added support for activity matrices.
Activities can now have multiple items and sub-items.
This patch breaks current datafile format, which becomes
no longer compatible with previous one.
Create a new activity (A_HUGE) for hugepages statistics.
Hugepages statistics have been added as an additional output
for memory activity by commit
d7ed8d382140e2d709a6753fa44a0acfcba91a7e.
Create a dedicated activity for them (A_HUGE). This is quite cleaner
although the drawback is that /proc/meminfo file will be now read twice.
Added SADC_OPTIONS to sysstat configuration file, and sysstat(5) manual page.
Mail from Ivana Varekova (20/09/2010):
SADC_OPTIONS is now the prefered way to pass args to sadc. It is read from
sa1 and sa2 shell scripts from /etc/sysconfig/sysstat configuration file.
Also add sysstat(5) manual page that describes the various environment
variables and their meanings.
Fixed configure's --disable-man-group option.
Mail from Ivana Varekova (21/09/2010):
Using --disable-man-group option with configure resulted in man_group variable
being used. With --enable-man-group, the variable was ignored, which is the
opposite of what is expected.
This patch fixes that.
Moved manual pages from $prefix/man to $prefix/share/man.
Mail from Ivana Varekova (21/09/2010).
The Linux Filesystem Hierarchy now defines the default location for
manual pages as /usr/share/man instead of /usr/man.
So update sysstat to reflect this change.
See: http://tldp.org/LDP/Linux-Filesystem-Hierarchy/html/Linux-Filesystem-Hierarchy.html#usr
Fixed XML output for hugepages utilization statistics.
Indentation was wrong after displaying hugepages stats in XML format.
Code cleaned.
Updated .gitignore file to ignore some more files.
Updated various source headers: (C) 2010 instead of (C) 2009.
Updated sar manual page: sar -A also includes -m ALL.
Added hugepages utilization statistics.
Added option -H to sar to display hugepages utilization statistics.
Sar manual page updated.
DTD and XSD documents updated (v2.9)
Start release 9.1.6 and make it git aware.
First use of git system. Based on a complete sysstat 9.1.5 version.
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