On Tue, 2008-04-08 at 16:37 -0700, Bernard Li wrote: > So I'd like to ask the Ganglia community -- do you guys find Ganglia > to be a resource hog?
Sorry this reply is coming so late, but I haven't been able to read the mailing list for several weeks. My experience is that Ganglia is not resource intensive at all, when configured properly. Looking at some of my gmond instances, you can barely tell they are doing anything. The load on an idle system is almost zero even with gmond running. Network traffic on an idle node is minimal (and most of that seems to come from NFS traffic). Personally, whenever I have heard people complain about ganglia being too "resource intensive", it seems that usually the problem is related to one of two things: 1) Gmetad is getting bogged down with I/O. (The person was unfamiliar with the tmpfs-type approaches used to reduce the load.) 2) Gmond is configured to use broadcast. (The person hasn't figured out how to configure unicast and send data "out" of the cluster to another host, so their nodes end up sending a lot of unnecessary network traffic.) I have a ganglia setup that collects 58606 metrics from 1417 hosts, and it runs just fine. (The gmetad/web-frontend portion runs on a server that also runs two Nagios daemons, an LDAP replica, and some odd java app for our SAN. Even then, the load is still only ~1.0 on average.) So whenever I hear someone make a comment about how "Ganglia works fine until you have more than a couple hundred nodes", I do my best to restrain myself from beating them and educate them instead :-) -- Rick Mohr Systems Developer Ohio Supercomputer Center ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Ganglia-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ganglia-general
