The following program has constant (+- 10 MB) memory usage in CPython,
but it quickly leaks massive amounts of memory in pypy.
It simply assigns one bit of an array to another slice. The length of
the array remains constant (so there's nothing to delete from inside the
program)
pypy-1.5 (pypy-c-jit-43780-b590cf6de419-linux)
import array
import time
a = array.array('i', 'a' * 100000)
for i in range(1,100000):
a[1:1000] = a[2001:3000]
time.sleep(0.0001) # So you can go check mem usage.
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