[rrd-users] Re: Faster tool to generate graphs using RRD files

[Woodcock, Bradford]

Hi Pavel,

Is your system falling down on I/O or is it cpu? You may want to look at
the cpu also when it slows down. Reason I ask is that if it is cpu then
a dual processor may do wonders for you. One processor handles the large
back-end target config work but as interactive users come in (via cgi)
then they would likely get the second processor. Of course if users are
already on the 1st cpu then there is nothing to be done. But if the
machine is mainly used for just mrtg then the cgi calls for graphs may
get there fair share.

However if it is I/O bottleneck then the disk config may be your answer,
as you are already investigating.

Cheers,
Brad...

http://www.inframon.org - infraMon: Network Infrastructure Monitor
http://www.micro-mess.com/forum/ - infraMon Questions/Discussions
 

-----Original Message-----
From: rrd-users-bounce at list.ee.ethz.ch
[mailto:rrd-users-bounce at list.ee.ethz.ch] On Behalf Of Pavel Ruzicka
Sent: Thursday, November 13, 2003 5:24 AM
To: Saravia, Jovanny - (Col); rrd-users at list.ee.ethz.ch
Subject: [rrd-users] Re: Faster tool to generate graphs using RRD files

Hi,

> Now I have aproximately 11000 targets and rrdtool continues being fine
to
> poll the variables in this targets. But unafortunately another problem
> appears:

I have about 6500 targets and I found some problematic parts.
For faster graphing is needed modperl in Apache.

Problem is with writing 6500 files. MRTG gets targets, system (linux)
caches
data to RAM and after few seconds kernel tries flush buffers on to disk.
Now begins hell for interactive applications. System is totally dead for
about 1 minute. I have idea, that on this helps more RAM (I have 512MB),
faster SCSI disk 15000RPM (I have 7200RPM) and maybe RAID SCSI
controller
with huge cache. Processor speed is not too important (I have 2x
400MHz).

I use 14all.cgi.

Best regards,

Pavel Ruzicka

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