Hi Jared, Today Jared Henley wrote:
> Hi, > > I've been working on a logging application that uses rrdtool. It works > brilliantly on my PC, not so good on the Raspberry Pi model B+. But before I > go there, there's something interesting I noticed while working on the PC. > > I'm creating a database with the following command (in rrdpython) > > rrdtool.create(filepath, > '--step', '1s', > 'DS:progreset:GAUGE:1000s:0:1', > 'RRA:MAX:0.1:5s:5000m', > > <snip - there are 29 definitions all up, all the same> > > This creates a 386MB file. > > I didn't think too hard about it, until I did a graph to a CSV file. Of > course the CSV would be less space-efficient than the binary rrd file, right? > But the generated CSV turns out to be only 15MB? > > rrdtool seems to use 64-bit integers for everything, so I figure the rrd file > above should use: > 8 bytes per RRA entry * 29 RRAs + 1 timestamp * 60,000 locations in the > round-robin (5000 minutes / 5 seconds) = 14.4MB. I'm confused. Why is the rrd > file 30 times bigger than I'd expect? I did experiment with a step size of 5 > seconds, but the created file was the same size. But I can live with largish > files. when I create this database on my intel box it looks like this: oetiker>./rrdtool create /tmp/demo.rrd --step 1s DS:progreset:GAUGE:1000s:0:1 RRA:MAX:0.1:5s:5000m oetiker>ls -l /tmp/demo.rrd -rw-r--r-- 1 oetiker oep 480584 Oct 16 08:17 /tmp/demo.rrd so something looks rather odd here ... are you using 1.5.4 on your raspy ? cheers tobi -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland www.oetiker.ch t...@oetiker.ch +41 62 775 9902 _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
