Hi Markus,
in case you want to save some time, you can get RRDTool compiled for AIX
and packaged as RPM from my website at
http://www.perzl.org/aix/.
The direct link is http://www.perzl.org/aix/index.php?n=Main.Rrdtool.
Regards,
Michael
Markus Reusch wrote:
Aroop Maliakkal schrieb:
It might be worth checking the disk IO... Disk IO is the main
constraint on monitoring clusters/grids actually.
On Dec 12, 2007 5:42 PM, Markus Reusch < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Hi list(eners),
we are using Ganglia for about 20-30 AIX-Systems. All data is
collected
on 2 LPARs which run gmetad, rrdtool and the Apache, so it's
accessible
for the users with the supplied PHP web frontend.
Our rrd-database has currently a size of about 400 MB and consists of
about 4800 files. I have no idea if this size or number of files is a
problem at all.
Every day, several users connect to the web frontend and open those
graphs, which results in some rrdtool calls, exhausting all the
available CPU time of the machine. No matter if it's just 4 rrdtool
processes or 20 of them. The machine is already at it's limit when
working with 4 rrdtool calls. When about 20 of them are started, a 2
digit number of kernel threads is being queued...
When all this occurs, you are not able to type properly in your ssh
session and even some shell scripts being called by cron are having
problems and give delayed output. This is no peak behaviour - it's
constantly like this.
The LPAR has AIX 5.3 with 1 * 1,7 MHz CPU and 2 GB RAM. VMM is
tuned and
machine is usually not paging at all. Not a strong machine but we
thought sufficient for Ganglia + rrdtool + Apache.
Other applications on the machine are not noticable, as you can
see (topas):
Name PID CPU% PgSp Owner
rrdtool 458924 26.0 0.5 nobody
rrdtool 966772 25.4 0.4 nobody
rrdtool 1302770 23.0 3.6 root
rrdtool 1183858 22.4 0.4 nobody
gmetad 1110100 8.2 5.3 nobody
topas 1159188 0.6 1.7 root
gmond 352448 0.1 1.7 nobody
java 848106 0.0 16.2 root
sched 12294 0.0 0.4 root
clstrmgr 405650 0.0 22.5 root
A snippet from vmstat to see yourself (currently 4 rrdtools are
running):
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
5 1 304078 4075 0 0 0 0 0 0 285 22896 1079 90 10
0 0
6 1 303783 4373 0 0 0 0 0 0 249 2038 787 98 2 0 0
6 0 304004 4145 0 0 0 0 0 0 239 17285 1001 92 8 0 0
Here is a sample process of rrdtool taken with ps:
/usr/bin/rrdtool graph --start 1197456160 --end 1197459760 --width
300
--height 75 --title weight - DEF:sum=/var/lib/ganglia/rrds/PL1650
Linie
SRZ/<somehostname>/weight.rrd:sum:AVERAGE
AREA:sum#0000ff:<somehostname>
last hour (now -1.00)
My questions:
Is it normal behaviour/configuration, that so many rrdtools are
started
when people are doing some requests to the web frontend?
Do you guys spend a "big" box just running Ganglia + rrdtool +
Apache or
maybe just a small Intel/Linux box and it runs smooth?
Any suggestions/hints are welcome, thank you in forward.
Greetings
Markus
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Regards,
Aroop
~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=
Hi Aroop,
thank you for the hint - we don't have a disk issue. I/O wait is about
zero and iostat shows only low traffic on the disks both on the
percentage of time for interval being used and the bandwith and
transfers. They are all low.
Meanwhile I found this in the archives:
http://sourceforge.net/mailarchive/forum.php?forum_name=ganglia-general&max_rows=25&style=nested&viewmonth=200712
So I am trying to compile the latest stable version of rrdtool 1.2.26.
Later
Markus
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