RRD &reftitle.intro; The PECL/rrd extension provides bindings to the RRDtool C library. RRDtool is the open source industry standard, high performance data logging and graphing system for time series data. The RRDtool homepage is &url.rrd;. &reference.rrd.setup; &reference.rrd.examples; &reference.rrd.reference; &reference.rrd.rrdcreator; &reference.rrd.rrdgraph; &reference.rrd.rrdupdater;