This tool's objective is to answer the question, "Was the CPU load high last night when Foobar broke?" in a simple way that does not require complex monitoring systems. In conjunction with the lightweight sysstat daemon, this tool makes easy to read histograms in your shell.
There are two modes, CPU and NET mode.
CPU mode shows the data you're used to seeing in tools like htop, processor usage, memory usage, and per-core load average. NET mode displays total network throughput on all interfaces as a proportion of the highest measured value, and the system's run queue and blocked threads.
Output:
./sachart -cpu
TIME | CPU | MEMORY | LOAD AVG
13:10:01 |@###### |**** ||||
13:15:01 |@###### |**** |||||
13:20:01 |@####### |**** |||||
13:25:01 |@####### |**** |||||
13:30:01 |@####### |**** ||||||
13:35:01 |## |**** ||||
13:40:01 | |**** ||
13:45:01 | |**** |
./sachart -net
TIME | DOWNLOAD | UPLOAD | IO (RunQ + Blocked)
13:10:01 |=================== |======================== |
13:15:01 |================= |======================== |--------------
13:20:01 |===================== |========================= |--------
13:25:01 |========================= |======================== |-
13:30:01 |======================= |======================== |---
13:35:01 |===== |===== |--
13:40:01 | | |
13:45:01 | | |
Previous days data can also be viewed by using the -days flag. For example, to see yesterday's CPU graph:
./sachart -cpu -days 1
TIME | CPU | MEMORY | LOAD AVG
13:20:02 | |* |
13:25:01 |# |**** |
13:30:01 |# |**** |
13:35:01 |# |**** ||
13:40:01 |@## |**** |||
Make sure sysstat is installed:
sudo apt install sysstat
The service should be running:
sudo systemctl enable --now sysstat.service
And data collection should be enabled:
sudo sed -i 's/false/true/g' /etc/default/sysstat