Hi there, On Thu, 19 Jun 2008, Allan Eising wrote:
> ... 20 FPing processes ... 1997 nodes to be monitored ... the FPing > processes take too long ... any guidelines for a recommended number > of hosts per FPing process, so I might be able to write this into my > system, to maintain scalability. Unfortunately object-oriented Perl, while great for prototyping and coding on the hoof, is fairly costly in terms of computer resources. I think that's at least partly what you're up against. My feeling is that the entire setup isn't really scalable. Looking at the processes running on my master smokeping host, about 1500MBytes of RAM (25 percent of the memory in the host) is used by approximately thirty processes (mostly FPing) in order to do little but sleep for the next few hundred seconds. Between them, in a couple of days they have used nearly as much CPU as the X server has in a month - almost three minutes. The network I'm monitoring has only a few dozen hosts. Meanwhile my trusty cron process runs more stuff than you can shake a stick at with next to no load on the server - just under a megabyte, and 7.2 seconds of CPU in a month. It is certainly feasible to ping a few thousand hosts using a single process without gobbling up gigabytes of memory and seconds of CPU. I'm tempted to code something but I'm convinced that it must already have been done. If I did write something, it would be in C. I'd be very disappointed if it used more than a couple of megabytes of RAM, and more than a few milliseconds of CPU per host per ping cycle which would include logging the results to a database. I hope that these back-of-an-envelope figures give you an idea of what should ultimately be achievable. Are you doing a lot of logging? You might be able to trim things by eliminating unnecessary disc accesses. None of this should be relevant to the Web front-end of course, most of the time you don't even need to be running it. -- 73, Ged. _______________________________________________ smokeping-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/smokeping-users
