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I wrote a simple python program that looks to me like it should be cpu intensive:
for a in range(0,1500):
for b in range (0,a):
for c in range(0,b):
x = a+b+c
print x
What happens is that it takes a really long time on solving it, but cpu consumption stays at around 25%. Why does this happens insead of using more cpu for a shorter time?
You’re probably running this on a quad-core CPU. Since this code will only run on one core, it will show as taking 25% of the total, when the single core is actually at 100%.
On some operating systems, CPU usage will be shown as 100% per core (so that the total can go above 100%). On those operating systems your code should show 100% CPU usage.