This document provides summaries of updates and new features for the RRDtool software, including improvements to the Windows version, new functions like MEDIAN for CDEF expressions, performance boosts for large graphs, option to ignore past updates, and continuous integration testing. It also describes ways to pull data and configuration from existing RRD files, use RRDtool graph to chart arbitrary data, and create interactive RRDgraphs on the web.

1. Neues aus der Welt von
RRDtool
Tobias Oetiker
OETIKER+PARTNER AG
www.oetiker.ch

2. compile rrdtool on a system
without graphics libraries
./configure --disable-rrd_graph
RRDTo

3. improvements to the
windows version of rrdtool
RRDTo

4. valid JSON output from rrdtool xport
{ "hello": "yes this is json" }
RRDTo

5. fake non existing "step 1 RRA"s
for MIN, MAX and LAST
RRDTo

6. a MEDIAN operator for CDEF expressions
CDEF:x=a,b,c,d,4,MEDIAN
RRDTo

7. new stack operators:
DEPT, INDEX, COPY, ROLL
a,b,DEPTH -> a,b,2
a,b,c,1,INDEX -> a,b,c,c
a,b,c,d,2,COPY -> a,b,c,b,c,d
a,b,c,d,3,1,ROLL -> a,d,b,c
a,b,c,d,3,-1,ROLL -> a,c,d,b
RRDTo

8. optionally ignore past updates
with rrdtool update
rrdtool --skip-past-updates x.rrd 1410794816:42
RRDTo

9. optionally ignore LINE or AREA
commands for chart scaling
LINE:ds1#ff0000:Test:skipscale
RRDTo

10. detect 2038 problem
32-bit time overflow
RRDTo

11. performance boost for large graph
expressions with 1000+ DEF lines by using
HASH map
RRDTo

12. improved cross-compilation support
RRDTo

13. .Net bindings
RRDTo

14. new rrdtool graph option to skip non-existing
source files
rrdtool graph --use-nan-for-all-missing-data ...
RRDTo

15. continuous integration through
travis-ci on GitHub
RRDTo

16. finally a growing test suite with
travis integration
RRDTo

17. restore from a pipe
rrdtool dump x.rrd | rrdtool restore - y.rrd
RRDTo

18. RRA row count and step
can be defined in absolute time
rrdtool create power.rrd
--start now-2h --step 1s
DS:watts:GAUGE:5m:0:24000
RRA:AVERAGE:0.5:1s:10d
RRA:AVERAGE:0.5:1m:90d
RRA:AVERAGE:0.5:1h:18M
RRDTo

19. all new create on steroids can pull both
data and configuration from existing rrd
files
rrdtool create --template s.rrd y.rrd
rrdtool create --source a.rrd
DS:a=b:DERIVE:300:0:1 RRA:AVERAGE:0.5:1:100
RRDTo

20. use rrdtool graph to chart arbitrary data
via a callback function for data fetching
RRDs::fetch_register_callback sub {
my $request = shift;
...
return { start => $unix_timestamp,
step => $step_width,
data => { dsName1 => [ value1, …]},
RRDTo
}};
RRDs::graph( …, 'DEF:a=cb//string:ds1:AVERAGE');

21. new key value parser for rrdtool graph
FCNT:p1:[p2][:k1[=v1][:k2[=v2]]...
DEF:ds1=a.rrd:a:AVERAGE:step=7200:reduce=MAX
LINE1:ds1#FF0000:test:dashes=15,5:dash-offset=10
RRDTo

22. get rrdtool master from github now:
https://github.com/oetiker/rrdtool-1.x
> git clonegit@github.com:oetiker/rrdtool-1.x.git
> cd rrdtool-1.x
> ./bootstrap
> ./configure && make install
RRDTo

23. and one more thing ...
RRDTo

24. interactive rrdgraphs on the web
http://tobi.oetiker.ch/rrdgraph.js
RRDTo