[rrd-developers] Integrating rrdcached with Ganglia

Bernard Li bernard at vanhpc.org
Thu Sep 25 00:50:38 CEST 2008

Dear RRDTool and Ganglia developers:

For the last few days I have been working on integrating rrdcached
with Ganglia and the preliminary results are pretty promising.

On my benchmark server running gmetad, without rrdcached the load
would get way up there making the server unusable (due to high I/O
wait).  With rrdcached enabled, the load barely hit 2 and I/O wait is

I will post some more data later (maybe summary of `sar` output).

For Ganglia, both gmetad and apache processes need to access the
rrdcached socket, so I had the socket owned by nobody chgrp it to
apache (also making it group-writable).

If anybody is interested in testing this on EL4, I could post my RPMs.
 Code modification to Ganglia is pretty trivial.

I look forward to the official release of rrdcached as part of an
upcoming rrdtool release!

Special thanks to Florian, Kevin and Tobias for their hard work in
putting this together!



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