Version 13 (modified by oetiker, 15 years ago) (diff)


Features for RRDtool 1.3



The whole IO subsystem has been redone by Bernhard Fisher. It can now uses MMAPed IO for all rrd file access.

(Performance testing not done yet, but the load on the Kernel IO should be much lighter)


No more libart, no more strange error messages about stability. The switch to Cairo makes for a number of neat new features:

  • --graph-render-mode=mono brings back the rrdtool 1.0.x look and feel
    All antialiasing can be disabled ... font and graph seperately.
    . The antialiasing can be configured for graph and fonts separately.
  • full grid-fitting of all drawing operations makes for crisper looking graph output even when anti aliasing is active.
    Antialiased and grid fitted demo graph.
    The test graph rendered by rrdtool 1.2.23

We now use Pango for all text rendering. Pango integrates with Cairo, Freetype and Fontconfig. This has a number of implications:

  • Fonts are accessed through the fontconfig interface. This means you get access to all fonts on your system, and at the same time loose the ability to use true type fonts directly.
  • All text is passed through Pango Markup. This means it is now possible to switch font properties inside any rrdtool graph text field.


  1. rrdtool accelerator inspired by Philippe Simonet (tobi)
  2. Architecture independent data format with xdr (tobi with help from Matt Massie)
  3. command line parsing with popt (or some other thread-safe thing) (tobi)
  4. ALIGN:left|right|both function to alter the way rrdtool acts on encountering a full line. At the moment it justifies the line which may not look good in all cases


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