5 RRD Caching Daemon (rrdcached)
6 ------------------------------
7 by Florian Forster and Kevin Brintnall
9 The RRD Caching Daemon can dramatically improve the 'update' performance
10 of your system. Due to filehandling overheads, the time it takes todo one
11 update is virtually the same as to doing two updates in a row.
13 The Cache Daemon intercepts rrdtool update calls, assembling multiple
14 updates before writing them to the actual rrd file. When calling rrdtool
15 graph in such a setup, the command will tell the daemon to flush out all
16 pending updates for the rrd files, required to draw the graph.
19 RRD Dumping and Restoring (rrdtool dump/restore)
20 ------------------------------------------------
23 The output of rrdtool dump has been adjusted to be simpler to parse by
26 The restore core has been completely re-written yet again and is now relying
27 on an incremental xml parser. This has the advantage that the memory
28 consumtion while restoring xml files is only slighly larger than the
29 resulting rrd file. Which is much less than the requirements of the 1.3.
31 RRD Graphing functions (rrdtool graph)
32 --------------------------------------
35 * VDEF PERCENTNAN (a PRECENT that ignores NAN)
37 * CDEF PREDICT and PREDICTSIGMA functions for on-the-fly
38 data prediction without the need to modify existing rrd files as it is
39 required for HoltWinters.
41 * LibDBI integration provides a path to read data directly of a supported
42 SQL database into rrdtool graph.
47 * graph legends can now be placed left, right or above the graph with the
48 new --legend-direction and --legend-positon placement options.
51 * switched to using automake 1.11 which provides a 'silent' build process,
52 causing errors and warnings to stand out much more than before.
55 * switched from intltoolize to autopoint for the i18n configuration.
58 * lua bindings for rrdtool
61 * various improvements to rrd_open functions and mmap handling
64 * allow the HW smoothing window size to be set to 0 with rrdtool tune
67 * new graph option --border to set the 3d border width
68 by Bernhard Reutner-Fischer
70 * draw different color swats depending on the type of line drawn in the
73 for more detail see the CHANGES file.