[rrd-users] Re: Problem: RRDTool-Performance

[chihung at aspcentre.org]

If you are having 90000 files in a directory, you may have a DNLC 
(Directory Name Lookup Cache) performance problem. Check it 
with "vmstat -s" to see your "name lookups (cache hits xx%)". If your 
system falls below 90%, that means you need to tune your OS by 
increasing the "ufs_ninode" and "ncsize". These two parameters are 
configured automatically based on your RAM.

If your file name is longer than 30 characters, solaris may not cache 
the inode info (I think). 

The best bet will be to consolidate common parameters in one rrd file, 
eg ifInOctets, ifOutOctets, ifInErrors, ifOutErrors related to a 
interface/port in one rrd and try to keep the file name nice and short.

Hope this helps. 
--Chi Hung Chan
  Systems Manager
  ASP Centre (www.aspcentre.org)
  Singapore

-- 

CHAN CHI HUNG, MR
> ASP Centre, NTU
> Unit 216, NTU Innovation Centre
> 16 Nanyang Drive, Singapore 637722
> Tel: +65 6790 4420    Fax: +65 6316 0042
> Email: chihung at aspcentre.org
> URL: www.aspcentre.org



----- Original Message -----
From: roman at neofonie.de
Date: Friday, September 27, 2002 9:20 pm
Subject: [rrd-users] Problem: RRDTool-Performance

> 
> Hi Users, hi Tobi,
> 
> in our firma we are building a network monitoring tool. This 
> application 
> collects in specified intervals values via SNMP and stores they in 
> rrd-files, 
> every value in a single file, because of flexibility reasons. At 
> this time ca. 
> 90000 values are collected. 
> Now we must tune our application so that it can store these 90000 
> values in 
> 90000 rrd-files in 5 minutes. But rrdtool seems not to be able to 
> do it in this 
> time. We had try it in parallel processes and seriell too, but our 
> best solution 
> was a time of 20 minutes. As OS we use a normal speed sparc-
> solaris box.
> 
> Maybe anybody of you have ideas to speed up rrdtool according to 
> these 
> requirements, respectivly find reasons for this relativ slow 
> action. 
> 
> 
> Many thanks to you 
> 
> R¡ãman, neofonie GmbH    
> 
> 
> 
> P.S.: sorry for my bad english....
> 
> --
> Unsubscribe mailto:rrd-users-
> request at list.ee.ethz.ch?subject=unsubscribeHelp        mailto:rrd-
> users-request at list.ee.ethz.ch?subject=help
> Archive     http://www.ee.ethz.ch/~slist/rrd-users
> WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi
> 
> 

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi