On Sun, 25 Nov 2018, 'Martin R' via sage-devel wrote:
I still think that there is something odd going on. I do not understand the
following:
def check(n):
while True:
for P in Posets(n):
Q = P.with_bounds()
x = Q.moebius_function(Q.bottom(), Q.top())
print get_memory_usage()
The code can be made a little shorter:
def check(n):
while True:
for P in Posets(n):
x = P._hasse_diagram.moebius_function(0, n-1)
print get_memory_usage()
It still has the same error limit, i.e. check(6) works but check(7) does
not. I played a little with the code, and gc.collect() does not seem to
make anything. After a little more I got
AttributeError: 'FinitePoset_with_category' object has no attribute
'_hasse_diagram'
from the code!
I reset the notebook and tried
def check(n):
while True:
i = 0
for P in Posets(n):
x = P._hasse_diagram.moebius_function(0, n-1)
i += 1
if i > 2000:
break
print get_memory_usage()
and still get memory leak. But with i > 1000 it works. So it's not about
size of poset but the number of them.
Weird.
--
Jori Mäntysalo
