High Kernel CPU when running multiple python programs
If the problem exists in kernel, you should narrow down a problem using a profiler such as OProfile or perf.
I.e. run perf record -a -g and than read profiling data saved into perf data using perf report. See also: linux perf: how to interpret and find hotspots.
In your case high CPU usage is caused by competition for /dev/urandom -- it allows only one thread to read from it, but multiple Python processes are doing so.
Python module random is using it only for initialization. I.e:
$ strace python -c 'import random;while True: random.random()'open("/dev/urandom", O_RDONLY) = 4read(4, "\16\36\366\36}"..., 2500) = 2500close(4) <--- /dev/urandom is closedYou may also explicitly ask for /dev/urandom by using os.urandom or SystemRandom class. So check your code which is dealing with random numbers.