CPULimit

sudo apt-get install cpulimit

cpulimit -p [pid] -l [percentage]

cat << EOF > load.py
i = 0
while True :
    i += 1
EOF

python load.py &

top
================================
   PID  USER  PR  NI   VIRT   RES   SHR  S   %CPU  %MEM    TIME+  COMMAND
  4128  user  25   5  21608  5928  3464  R  100.0   0.3  0:03.53  python
================================

cpulimit -p 4128 -l 5 &

top
================================
   PID  USER  PR  NI   VIRT   RES   SHR  S   %CPU  %MEM    TIME+  COMMAND
  4128  user  25   5  21608  5928  3464  R    5.6   0.3  5:11.00  python
================================

Daiphys is a professional-service company for research and development of leading-edge technologies in science and engineering.
Get started accelerating your business through our deep expertise in R&D with AI, quantum computing, and space development; please get in touch with Daiphys today!

Daiphys Technologies LLC - https://www.daiphys.com/