4 #####################################
5 Major Changes between 1.2.x and 1.3.x
6 -------------------------------------
8 NEW Fast file access methods (Bernhard Fischer / Tobi Oetiker)
9 ----------------------------
10 * introduced file-accessor functions rrd_read/rrd_seek/rrd_write
12 * implemented full mmap-based file access with madvise hints for
13 improved scalability, much reduced memory-footprint and much less
14 blocking while accessing the disk
16 * implemented optional full file-descriptor access instead of FILE*
19 NEW Graphing (Tobi Oetiker)
21 * libart has been replaced by cairo/pango
23 * pango markup is supported (--pango-markup)
27 * --graph-render-mode=mono for non anti aliased graphing
29 * --font-render-mode=mono for non anti aliased fonts
31 * fonts come through fontconfig, use the Pango font nameing scheme
32 -> 'Times 20' ... it is not possible to use truetype fonts
35 * Tabs are position independent.
37 * TRENDNAN filter that ignores NAN values while calculating the
38 TREND data. (Timo Stripf)
40 * --full-size-mode to specify the outer border of the image and not
41 just of the graphing canvas (Matthew Chambers)
43 * TEXTALIGN command to alter default text alignment behavior
45 * C API in-memory graphing with rrd_graph_v (Evan Miller)
47 * draw dashed lines in graphs (Thomas Gutzler)
49 * new interface graphv which returns information using the rrd_info
50 interface (Tobi Oetiker and Mark Plaksin)
52 * improved horizontal grid. Have a bit more grid lines and y-axis
53 labels while keeping them far enough apart to not run into each
56 NEW Forecasting (Evan Miller)
58 * the new MHWPREDICT consolidation function uses a variation of the
59 Holt-Winters method. It is a drop-in replacement for HWPREDICT,
60 and is better suited for data whose seasonal variations grow or
61 shrink in proportion to the average.
63 * If you create an RRD with the new MHWPREDICT function, the
64 resulting rrd file will be version 0004 and can only be used in
69 * rrd_restore now uses libxml for parsing which makes things much
70 more tolerant towards xml variations. The old code could mostly
71 just parse the XML as it was output by rrdtool dump. See also:
72 the note at the bottom of this document. (by Florian octo
75 * rrd_update rewritten to make it more modular. Fixed two
76 longstanding HW bugs in the process (Evan Miller)
78 Internationalization (Takao Fujiwara and Tobi Oetiker)
80 * The help output by rrdtool has been internationalized. There are
81 no real translations included with rrdtool yet, contributions are
84 * The internationalization will only be compiled if libintl and
85 friends are available on your system. Use the configure option
86 --disable-libintl if you want to disable this feature
90 * ruby rrd_fetch will return step as a last property -- Mike Perham
92 RRDtool dump / restore incompatibility
93 --------------------------------------
94 * rrdtool dump 1.3 does emit completely legal XML. Basically this
95 means that it contains an XML header and a DOCTYPE definition.
96 Unfortunately this causes older versions of rrdtool restore to be
99 * To restore a new dump with an old rrdtool restore version, either
100 remove the XML header and the doctype by hand (both on the first
101 line of the dump) or use rrdtool dump --no-header.
104 ######################################################################################
105 Major Changes between 1.0.x and 1.2.x
106 ======================================================================================
110 * rewritten graphics generation based on libart.
111 - anti-aliased output
112 - alpha transparency support
115 * additional graphics formats: EPS, PDF, SVG
117 * extended multi-part documentation
119 * VDEF support; define and use variables. Find, and use, the
120 maximum rate seen by rrdtool; compute and show the average
122 * Sliding window (trend) analysis
123 Compute a smoother average, for instance over the last 6 CDPs
125 * percentile (95th or other)
126 Remove peaks, 95 percent of all rates are at or below the
131 * a second logging interface: rrdtool updatev
132 Verbose updating of the database; show CPDs being created
134 * Aberrant Behavior Detection with Holt-Winters Forecasting
135 Compare current data with expected data, detect and log when
136 the rates are outside expected levels
138 * COMPUTE data type for artificial data-sources calculating their
139 input using RPN math and data from the other data-sources.
143 * Colons in COMMENT arguments to rrdtool graph must be escaped with a backslash
145 * the --alt-y-mrtg option is gone or rather since 1.2.7 it is back but
146 without functionality.
148 * In pipe mode, rrdtool answers with OK only if it was successful with the
149 command. Otherwhise the answer will be ERROR...
154 * In order to support Holt-Winters and Calculated Datasources,
155 the rrdtool data format has changed. While the new version of rrdtool can
156 read files created with rrdtool 1.0.x. It is not possible to read files
157 created by rrdtool-1.2.x with rrdtool-1.0.x
159 * External libraries are not included with rrdtool anymore. This is in line
160 with todays trend of using shared libraries everywhere. With the exception
161 of the cgi library most things required by rrdtool will be found on every recent
164 * Memory Mapped IO support for faster logging.