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Hook documentation?
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cigamit
Developer


Joined: 07 Apr 2005
Posts: 945
Location: B/CS Texas
PostPosted: Thu Mar 15, 2007 9:16 pm    Post subject: Reply with quote
Howie wrote:
What I really meant was - is there any issue with a fairly long-running process hooking into poller_output?


Just remember that the poller_output hook will get called once per host, so if you are using it to launch a new process, it will launch that new process multiple times. Any other major computations it has to do will just slow down your polling slightly, nothing more.
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Howie
Cacti Guru User


Joined: 16 Sep 2004
Posts: 2135
Location: United Kingdom
PostPosted: Fri Mar 16, 2007 3:21 am    Post subject: Reply with quote
cigamit wrote:
Howie wrote:
What I really meant was - is there any issue with a fairly long-running process hooking into poller_output?


Just remember that the poller_output hook will get called once per host, so if you are using it to launch a new process, it will launch that new process multiple times. Any other major computations it has to do will just slow down your polling slightly, nothing more.


OK. So I think I actually need a 3-step process:

poller_top: parse all the map configs, decide if any need poller_output data

poller_output: save away the required data in a table somewhere

poller_bottom: draw the maps (which can have a mix of data sources, so they need to be done after rrd updates in a non-boost system).

The easy way of doing that - holding all the map objects in memory between poller_top and poller_bottom - sounds like it'll be quite memory-hungry. and worse, memory hungry before the poller has run, so possible to kill it Time for a rethink.
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rony
Developer/Forum Admin


Joined: 17 Nov 2003
Posts: 5448
Location: Wisconsin, USA
PostPosted: Fri Mar 16, 2007 8:44 am    Post subject: Reply with quote
Memory table in mysql 5.x and greater? And a temporary table in 4.x and less?
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