Once when messing with command-line features a bit, I found out that a simple 1-line code can bring my CPU to 100% load in a second for as long as I want. If I really wanted to test the reliability of my CPU fan or water cooling system, I would run this tiny code for pretty long time like a few hours to make my CPU sweat a bit. Now to that simple code – bring up the Run window by pressing Win+R and start command line by putting cmd in it. Here comes that simple loop:

for /L %i in (1,1,#) do help
(replace the # with a number determining how many loops will be executed and also how much time it’ll take to finish the task, depending on your CPU’s performance)

Pretty simple, huh? It does nothing else than to repeat displaying command-line’s built-in help which should raise (according to my multiple tests) every single-core CPU load to 100% and maintain it at that level for the time the script is executed. That’s all folks !