## Troubleshooting and Debugging

### Tooling
 
```
observability, benchmarking, tuning, static performance tuning, profiling, and tracing
```

- uptime
  - Useful for CPU load averages (no of processes wanting to run)
  - *High Level* idea of system usage, moving sum average of 1, 5, 15 minute.
  - "High level" because gives some idea of how the load is changing on a system, i.e. if the load average at 1 min is more than that of 15 min, the load is increasing, or if reverse then load is decreasing. If load is 0.0, then CPU is idle
  - Load averages : CPU demand
  
- 
  
  ad averages
dmesg | tail
vmstat 1
mpstat -P ALL 1
pidstat 1
iostat -xz 1
free -m
sar -n DEV 1
sar -n TCP,ETCP 1
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