Saw this on the MRTG-DEV list. NaN handling is perceived to be problematic, it seems.
----- Forwarded message from Tobi Oetiker <t...@caida.org> ----- Date: Wed, 30 Jun 1999 02:16:55 +0200 (MET DST) From: Tobi Oetiker <t...@caida.org> To: Jesper Skriver <jes...@skriver.dk> cc: mrtg-develop...@list.ee.ethz.ch Subject: Re: [MRTG-DEV] CDEF's with LT and IF in .42 Today you sent me mail regarding Re: [MRTG-DEV] CDEF's with LT and IF in .42: *> On Tue, Jun 29, 1999 at 09:01:29PM +0200, Tobi Oetiker wrote: *> *> > aha ... thats in a perl context .. sorry I didn't realize ... could you send *> > me an example rrd and a short programm which demonstrates the problem ? *> *> Yes, this does the trick, it's very ugly code ... *> *> http://e.t.dk/test.pl test program, set $this_breaks to have it core dump *> http://e.t.dk/test.rrd FreeBSD 3.2-STABLE rrd *> http://e.t.dk/test.xml The above dump'ed into xml OK found your problem .... it is that old FreeBSD does no proper IEEE math ... for some comparison operations it raises an sigfpe if an NaN is involved ... the next release of rrdtool will come with a proper test to find the problem and a proper fix in the software to ignore sigfpe cheers tobi *> /Jesper *> *> -- ______ __ _ /_ __/_ / / (_) Oetiker, hacking RRDTOOL&MRTG @ Caida for the Summer / // _ \/ _ \/ / +1 619 822 0882 / t...@caida.org / www.caida.org/~tobi /_/ \.__/_.__/_/ _______________________________________________________ -- * To unsubscribe from the mrtg-developers mailing list, send a message with the subject: unsubscribe to mrtg-developers-requ...@list.ee.ethz.ch * Mailing list archives are at http://www.ee.ethz.ch/~slist/mrtg-developers ----- End forwarded message ----- -- Jos Backus _/ _/_/_/ "Reliability means never _/ _/ _/ having to say you're sorry." _/ _/_/_/ -- D. J. Bernstein _/ _/ _/ _/ jos.bac...@nl.origin-it.com _/_/ _/_/_/ use Std::Disclaimer; To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
