https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/yhdc-sct-013-000-ct-sensor-report rrdtool create power.rrd --step 1s DS:watts:GAUGE:1:0:6600 RRA:AVERAGE:0.5:1s:1d # Buggy: nécessite des updates toutes les 500 ms rrdtool create power.rrd --daemon /var/run/rrdcached.sock --step 1s DS:watts:GAUGE:1:0:6600 RRA:AVERAGE:0.5:1s:1d # Buggy: nécessite des updates toutes les 500 ms rrdtool create /var/lib/rrdcached/db/power.rrd \ --step 1s \ DS:watts:GAUGE:1s:0:10000 \ RRA:AVERAGE:0.5:1s:1d \ RRA:AVERAGE:0.5:1m:3d \ RRA:AVERAGE:0.5:15m:1w \ RRA:AVERAGE:0.5:1h:30d \ RRA:AVERAGE:0.5:1d:3y \ RRA:MAX:0.5:1d:3y \ RRA:AVERAGE:0.5:1month:10y \ RRA:MAX:0.5:1month:10y Ceci n'est pas rafraîchi très souvent: watch -n 0.5 rrdtool graphv - '-s' '1546280606' 'DEF:watts=/var/lib/rrdcached/db/power.rrd:watts:AVERAGE' 'VDEF:avg=watts,AVERAGE' 'VDEF:last=watts,LAST' 'PRINT:avg:%lf' 'PRINT:last:%lf' Alors que ça si: watch -n 0.5 rrdtool lastupdate --daemon /var/run/rrdcached.sock /var/lib/rrdcached/db/power.rrd