1 #####################################
2 Major Changes between 1.4.x and ...
3 -------------------------------------
8 * GRAD element for graph, it acts more or less like an AREA,
9 except you can specify a second color and a height which is used to
10 create a gradient from one color to the next
16 #####################################
17 Major Changes between 1.3.x and 1.4.x
18 -------------------------------------
20 RRD Caching Daemon (rrdcached)
21 ------------------------------
22 by Florian Forster and Kevin Brintnall
24 The RRD Caching Daemon can dramatically improve the 'update' performance
25 of your system. Due to file handling overheads, the time it takes todo one
26 update is virtually the same as to doing two updates in a row.
28 The Cache Daemon intercepts rrdtool update calls, assembling multiple
29 updates before writing them to the actual rrd file. When calling rrdtool
30 graph in such a setup, the command will tell the daemon to flush out all
31 pending updates for the rrd files, required to draw the graph.
33 See rrdcached documentation.
35 RRD Dumping and Restoring (rrdtool dump/restore)
36 ------------------------------------------------
39 The output of rrdtool dump has been adjusted to be simpler to parse by
42 The restore core has been completely re-written yet again and is now relying
43 on an incremental xml parser. This has the advantage that the memory
44 consumption while restoring xml files is only slightly larger than the
45 resulting rrd file. Which is much less than the requirements of the 1.3 and
48 RRD Graphing functions (rrdtool graph)
49 --------------------------------------
52 * VDEF PERCENTNAN (a PRECENT that ignores NAN)
54 * CDEF PREDICT and PREDICTSIGMA functions for on-the-fly
55 data prediction without the need to modify existing rrd files as it is
56 required for HoltWinters.
58 * LibDBI integration provides a path to read data directly of a supported
59 SQL database into rrdtool graph. See rrdgraph_libdbi documentation.
63 * graph legends can now be placed left, right or above the graph with the
64 new --legend-direction and --legend-positon placement options.
67 * switched to using automake 1.11 which provides a 'silent' build process,
68 causing errors and warnings to stand out much more than before.
71 * switched from intltoolize to autopoint for the i18n configuration.
74 * new graph option --grid-dash on:off to configure the dash length
75 in the grid painted over the graph by Tobi Oetiker
77 * lua bindings for rrdtool
80 * various improvements to rrd_open functions and mmap handling
83 * allow the HW smoothing window size to be set to 0 with rrdtool tune
86 * new graph option --border to set the 3d border width
87 by Bernhard Reutner-Fischer
89 * draw different color markers (enable with --dynamic-labels) depending on the
90 type of element in the graph by Loïc Tortay
92 for more detail see the CHANGES file.
94 #####################################
95 Major Changes between 1.2.x and 1.3.x
96 -------------------------------------
98 NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
99 ----------------------------
100 * introduced file-accessor functions rrd_read/rrd_seek/rrd_write
102 * implemented full mmap-based file access with madvise hints for
103 improved scalability, much reduced memory-footprint and much less
104 blocking while accessing the disk
106 * implemented optional full file-descriptor access instead of FILE*
109 NEW Graphing (Tobi Oetiker)
111 * libart has been replaced by cairo/pango
113 * pango markup is supported (--pango-markup)
117 * --graph-render-mode=mono for non anti aliased graphing
119 * --font-render-mode=mono for non anti aliased fonts
121 * fonts come through fontconfig, use the Pango font naming scheme
122 -> 'Times 20' ... it is not possible to use true-type fonts
125 * Tabs are position independent.
127 * TRENDNAN filter that ignores NAN values while calculating the
128 TREND data. (Timo Stripf)
130 * --full-size-mode to specify the outer border of the image and not
131 just of the graphing canvas (Matthew Chambers)
133 * TEXTALIGN command to alter default text alignment behavior
135 * C API in-memory graphing with rrd_graph_v (Evan Miller)
137 * draw dashed lines in graphs (Thomas Gutzler)
139 * new interface graphv which returns information using the rrd_info
140 interface (Tobi Oetiker and Mark Plaksin)
142 * improved horizontal grid. Have a bit more grid lines and y-axis
143 labels while keeping them far enough apart to not run into each
146 NEW Forecasting (Evan Miller)
148 * the new MHWPREDICT consolidation function uses a variation of the
149 Holt-Winters method. It is a drop-in replacement for HWPREDICT,
150 and is better suited for data whose seasonal variations grow or
151 shrink in proportion to the average.
153 * If you create an RRD with the new MHWPREDICT function, the
154 resulting rrd file will be version 0004 and can only be used in
159 * rrd_restore now uses libxml for parsing which makes things much
160 more tolerant towards xml variations. The old code could mostly
161 just parse the XML as it was output by rrdtool dump. See also:
162 the note at the bottom of this document. (by Florian octo
165 * rrd_update rewritten to make it more modular. Fixed two
166 longstanding HW bugs in the process (Evan Miller)
168 Internationalization (Takao Fujiwara and Tobi Oetiker)
170 * The help output by rrdtool has been internationalized. There are
171 no real translations included with rrdtool yet, contributions are
174 * The internationalization will only be compiled if libintl and
175 friends are available on your system. Use the configure option
176 --disable-libintl if you want to disable this feature
180 * ruby rrd_fetch will return step as a last property -- Mike Perham
182 RRDtool dump / restore incompatibility
183 --------------------------------------
184 * rrdtool dump 1.3 does emit completely legal XML. Basically this
185 means that it contains an XML header and a DOCTYPE definition.
186 Unfortunately this causes older versions of rrdtool restore to be
189 * To restore a new dump with an old rrdtool restore version, either
190 remove the XML header and the doctype by hand (both on the first
191 line of the dump) or use rrdtool dump --no-header.
194 ######################################################################################
195 Major Changes between 1.0.x and 1.2.x
196 ======================================================================================
200 * rewritten graphics generation based on libart.
201 - anti-aliased output
202 - alpha transparency support
205 * additional graphics formats: EPS, PDF, SVG
207 * extended multi-part documentation
209 * VDEF support; define and use variables. Find, and use, the
210 maximum rate seen by rrdtool; compute and show the average
212 * Sliding window (trend) analysis
213 Compute a smoother average, for instance over the last 6 CDPs
215 * percentile (95th or other)
216 Remove peaks, 95 percent of all rates are at or below the
221 * a second logging interface: rrdtool updatev
222 Verbose updating of the database; show CPDs being created
224 * Aberrant Behavior Detection with Holt-Winters Forecasting
225 Compare current data with expected data, detect and log when
226 the rates are outside expected levels
228 * COMPUTE data type for artificial data-sources calculating their
229 input using RPN math and data from the other data-sources.
233 * Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
235 * the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
236 without functionality.
238 * In pipe mode, rrdtool answers with OK only if it was successful with the
239 command. Otherwhise the answer will be ERROR...
244 * In order to support Holt-Winters and Calculated Datasources,
245 the rrdtool data format has changed. While the new version of rrdtool can
246 read files created with rrdtool 1.0.x. It is not possible to read files
247 created by rrdtool-1.2.x with rrdtool-1.0.x
249 * External libraries are not included with rrdtool anymore. This is in line
250 with todays trend of using shared libraries everywhere. With the exception
251 of the cgi library most things required by rrdtool will be found on every recent
254 * Memory Mapped IO support for faster logging.