You may know Linux tool stress which is very useful when you want to test whether your PC is stable enough even under long-term heavy load.
stress tool is able to stress the machine couple of ways:
`stress' imposes certain types of compute stress on your system
Usage: stress [OPTION [ARG]] ...
...
-c, --cpu N spawn N workers spinning on sqrt()
-i, --io N spawn N workers spinning on sync()
-m, --vm N spawn N workers spinning on malloc()/free()
...
-d, --hdd N spawn N workers spinning on write()/unlink()
...
Example: stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s
Let's show similar functionality using cpu-intensive.awk application mimicking plain computation effort (as stress -c 1 do), cpu-intensive.awk shows:
- use of expensive math
- functions
sqrt(), rand() - operator
**
- functions
- syntax of infinite loop
# terminal A
$ awk -f cpu-intensive.awk
..................................................
# terminal B
$ dstat -clm --noupdate 30
----total-cpu-usage---- ---load-avg--- ------memory-usage-----
usr sys idl wai hiq siq| 1m 5m 15m | used buff cach free
2 1 97 0 0 0|0.16 0.69 0.87|2931M 383M 1758M 2912M
13 4 83 0 0 0|0.14 0.67 0.86|2937M 383M 1763M 2901M
# cpu-intensive.awk started
27 1 72 0 0 0|0.27 0.68 0.86|2931M 383M 1758M 2911M
27 1 72 0 0 0|0.63 0.72 0.87|2929M 383M 1758M 2913M
28 3 68 0 0 0|0.81 0.76 0.87|2930M 383M 1758M 2912M
27 1 72 0 0 0|0.90 0.79 0.88|2930M 383M 1758M 2912M
27 1 72 0 0 0|0.96 0.84 0.89|2932M 383M 1758M 2910M
...