RRDtool
OpenSource industry standard (time series data: logging and graphing system)
RRDtool (round-robin database tool) is a data logging and graphing system for time series data such as network bandwidth, temperatures, and CPU load. The data is stored in a circular buffer-based database, thus the system storage footprint remains constant over time.
It also includes tools to extract round-robin data in a graphical format, for which it was originally intended.
Bindings exist for several programming languages, including Perl, Python, Ruby, Tcl, PHP and Lua. There is an independent full Java implementation called rrd4j.
General data storage
RRDtool assumes time-variable data in intervals of a certain length. This interval, usually named the step, is specified upon creation of an RRD file and cannot be changed afterwards. Because data may not always be available at just the right time, RRDtool will automatically interpolate any submitted data to fit its internal time steps.
The value for a specific step, after interpolation, is named a primary data point (PDP). Multiple PDPs may be consolidated according to a consolidation function (CF) to form a consolidated data point (CDP).
“RRDtool” enters the record as openSource industry standard (time series data: logging and graphing system). Crown Archives preserves that source wording while asking what RRDtool, OpenSource and industry can confirm, complicate or overturn.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jul 25, 2026. The linked authority identifier is Q1049812. 1 of 2 selected statements include explicit references; 2 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “RRDtool” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.