[collectd] RRDTool slowdowns

[Florian Forster]

Hi,

On Wed, Jun 30, 2010 at 04:04:31PM +0200, Alexander Wirt wrote:
> Unfortunatly that is a known problem with rrd 1.4.x, cairo is much
> slower than in 1.2.x. The only way to prevent this is to stay on 1.2  

unfortunately, it appears that graph generation isn't the only thing
that slowed down from 1.3 to 1.4. With RRDtool 1.4, an update causes *a
lot more* data to be read from disk than RRDtool 1.3 does. This results
in a slowdown from ~40 writes per second (RRDtool 1.3) to ~15 writes per
second (RRDtool 1.4) on the same machine.

I do not yet know what the cause of this is, but I'll try to track that
down.

Regards,
—octo
-- 
Florian octo Forster
Hacker in training
GnuPG: 0x91523C3D
http://verplant.org/
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