Re: Bug#543631: rrdupdate does not support floating point values with DERIVE, COUNTER
Tobias Oetiker <[email protected]>
| Newsgroups | gmane.comp.db.rrdtool.devel |
|---|---|
| Message-ID | <[email protected]> |
Hi Florian, Today Florian Weimer wrote: > * Tobias Oetiker: > > > OTOH with long long being available across the board, this might be > > a bit of a anachronism ... not quite sure though, what happens when > > you diff two doubles realy close to 2^64 ... does this stay > > accurate enough ? I guess a little magic would still be needed > > there ... care to investigate ? > > double is only exact up to about 2**52. long double goes till 2**63 > (or beyond), but is not available everywhere. The precision issue was > not apparent to me. > > We probably need to forcibly generate integer values for DERIVE and > COUNTER in the application that feeds rrdtool. another option would be to dynamically treat values with decimals different from integer values ... cheers tobi > -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch [email protected] ++41 62 775 9902 / sb: -9900