Hi Daniel, Today Daniel Pocock wrote:
> On 04/07/14 09:57, Tobias Oetiker wrote: > > Hi Plamen, > > > > Yesterday Plamen Dimitrov wrote: > > > >> Hi rrdtool users! > >> > >> As part of my google summer of code project with Ganglia I'm developing an > >> R package that imports the values from an RRD file into vectors in R > >> (without exporting to csv, xml or other intermediate format first). I'm > >> using the rrdfetch api to do this. Here is a working prototype: > >> > >> https://github.com/pldimitrov/Rrd > >> > >> > >> Wnile this seems to work fairly well, it struck me that in a scenario when > >> I'm only interested in reading one row at a time (e.g. to compare values > >> from many RRDs simultaneously) , the rrdfetch code would need to go through > >> all error/sanity checks, find the RRA we want and seek to the desired > >> location in the file at each iteration. > >> > >> I know the use of the internal rrd_read, rrd_seek, rrd_open, etc... > >> functions is not encouraged so I'm wondering what might be a good solution. > >> Ideally, it would be useful to have something that iterates one row at a > >> time, reads and caches the data. > >> > >> Does anything like this already exist? Would you agree it makes sense to > >> have this in addition to rrdfetch? > > no there is no iterator ... if you do see a memory problem with > > reading the whole file, you may want to split your reading into > > of say 10000 rows > > > Hi Tobi, > > What do you think of the other half of the question, simultaneously > reading a row from all the RRDs? > > Has anything like this been discussed before, has anybody else expressed > interest in that? Neither ... my question is, what is the purpose of such an endevour on the API level. cheer tobi > Regards, > > Daniel > > -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland www.oetiker.ch [email protected] +41 62 775 9902 _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
