Hi All,
tldr: the bottom of this post contains example code of which I would like
the results on some other systems.
I recently encountered a memory leak in the relatively innocently looking
code:
d = 27
M = 109
for i in range(10000):
for a in srange(M):
for r in srange(d):
tmp = r*a
However it doesn't seem to be on all platforms that sage supports. For
example on cocalc (ubuntu 20.04) one gets:
~$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 9.2, Release Date: 2020-10-24 │
│ Create a "Sage Worksheet" file for the notebook interface. │
│ Enhanced for CoCalc. │
│ Using Python 3.8.5. Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
sage: import gc
....: gc.collect()
....: mem = get_memory_usage()
....: d = 27
....: M = 109
....: for i in range(10000):
....: for a in srange(M):
....: for r in srange(1,d):
....: tmp = r*a
....: gc.collect()
....: print("memory usage 10k:", get_memory_usage(mem))
....: mem = get_memory_usage()
....: for i in range(20000):
....: for a in srange(M):
....: for r in srange(1,d):
....: tmp = r*a
....: gc.collect()
....: print("memory usage 20k:", get_memory_usage(mem))
....:
434
0
memory usage 10k: 9.15234375
0
memory usage 20k: 21.3984375
showing clear indication of a memory leak. While on my own laptop (OS X
10.13.6) I get:
~ mderickx$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 9.2, Release Date: 2020-10-24 │
│ Using Python 3.8.5. Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
sage: import gc
....: gc.collect()
....: mem = get_memory_usage()
....: d = 27
....: M = 109
....: for i in range(10000):
....: for a in srange(M):
....: for r in srange(1,d):
....: tmp = r*a
....: gc.collect()
....: print("memory usage 10k:", get_memory_usage(mem))
....: mem = get_memory_usage()
....: for i in range(20000):
....: for a in srange(M):
....: for r in srange(1,d):
....: tmp = r*a
....: gc.collect()
....: print("memory usage 20k:", get_memory_usage(mem))
....:
278
0
memory usage 10k: 0.0
0
memory usage 20k: 0.0
so here the memory leak does not occur. However I don't have any other
systems to which I have access to. So I was wondering if people could
execute the code below on some other systems and report back here to see
where the leaking is actually occurring. Since I do not have access to a
plain vanilla sage install on ubuntu, *I am especially interested if on
ubuntu the non cocalc enhanced version of sage also produces a memory leak
for the following code:*
import gc
gc.collect()
mem = get_memory_usage()
d = 27
M = 109
for i in range(10000):
for a in srange(M):
for r in srange(1,d):
tmp = r*a
gc.collect()
print("memory usage 10k:", get_memory_usage(mem))
mem = get_memory_usage()
for i in range(20000):
for a in srange(M):
for r in srange(1,d):
tmp = r*a
gc.collect()
print("memory usage 20k:", get_memory_usage(mem))
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