This slowly and inexorably goes on. Computing `sqrt(T2)` leaks 32 bytes
each and every time (asymptotically).
Found by a student who, through no fault of himself, brought down our
server (unable to ssh in until the OOM triggered -- but since the leak is
slow it takes a while to trash 16G of swap).
===
$ cat memleak.py
from sage.all import sqrt
T2 = sqrt(2)
import psutil
ps = psutil.Process()
base = ps.memory_info().rss
for a in range(1, 10):
for b in range(num := 100_000):
C = sqrt(T2)
mem = ps.memory_info().rss - base
print(f"{mem/1e6 :.2f} MB ({mem/a/num :.2f} bytes/iter)")
$ sage memleak.py
2.70 MB (27.03 bytes/iter)
5.95 MB (29.74 bytes/iter)
9.19 MB (30.64 bytes/iter)
12.44 MB (31.09 bytes/iter)
15.41 MB (30.82 bytes/iter)
18.65 MB (31.09 bytes/iter)
21.90 MB (31.28 bytes/iter)
25.14 MB (31.43 bytes/iter)
28.39 MB (31.54 bytes/iter)
===
Replace the 10 in the outer loop by something larger at your own peril
(each outer iteration will take 3.2M so 10_000 should kill a laptop in an
hour or two).
This is with system sagemath 10.0 but it also happens with 9.6, 9.7, 9.8
and 10.0 in cocalc.com.
Best,
Gonzalo
--
You received this message because you are subscribed to the Google Groups
"sage-devel" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-devel+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sage-devel/26ec41f7-c591-48b6-ab57-463b8b8a1675n%40googlegroups.com.
