[collectd] What about the scalability for collectd network plugin?
octo at collectd.org
Wed Mar 6 08:31:27 CET 2013
On Wed, Mar 06, 2013 at 07:01:29AM +0000, Benjamin Wang (gendwang) wrote:
> Is there any potential bottleneck for this scenario? Do you have any
> experienced data about the collectd performance?
your bottleneck is going to be the I/O performance when writing RRD
files to disk. With decent hardware (6x 15k disks in a RAID-10, e.g.)
you can expect between 100 and 200 updates per second. The "rrdtool"
plugin caches and batches these writes to help matters, or you can use
the external "rrdcached" which decouples config changes and cache
flushes. I suggest you read through the "Inside the RRDtool plugin"
article which describes the problem in detail and tells you which
mechanisms were implemented to cope with them.
In my experience, the network plugin itself is not a bottle neck.
 In this context, one "update" means one read/update/write cycle that
writes one or more values to a single RRD file.
collectd – The system statistics collection daemon
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