note monitoring basics

system/monitoring.md

@@ -0,0 +1,24 @@
+---
+title: "Monitoring"
+tags: [ "Documentation", "System", "CPU", "Memory" ]
+---
+
+Print the average CPU load over 1 minute, 5 minutes, and 15 minutes:
+
+```bash
+watch -d cat /proc/loadavg
+stress="$(cat /proc/loadavg | awk '{print "Usage:" $2"%"}')"
+```
+
+Show memory usage in Gibitytes.
+
+```bash
+free -g
+```
+Show low and high gigibtye usage on a *l*ine, and repeat the measurement every 5 seconds:
+
+```bash
+REP=5
+free --lohi -g -s $REP | lolcat
+```
+