Memory leak in srange #31511
Description
The following shows that there is a huge memory leak in the srange command, at least in the cocalc enhanced version of sage-9.2 on ubuntu 20.04:
~$ 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: M = 3000
....: import gc
....: gc.collect()
....: mem = get_memory_usage()
....: for i in range(10000):
....: R = srange(M)
....: gc.collect()
....: print("memory usage 10k:", get_memory_usage(mem))
....: mem = get_memory_usage()
....: for i in range(20000):
....: R = srange(M)
....: gc.collect()
....: print("memory usage 20k:", get_memory_usage(mem))
434
0
memory usage 10k: 884.4296875
0
memory usage 20k: 1770.71875
on my macbook with OS X 10.13.6 there seems to be no problem:
~ mderickx$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 9.2, Release Date: 2020-10-24 │
│ Using Python 3.8.5. Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
sage: M = 3000
....: import gc
....: gc.collect()
....: mem = get_memory_usage()
....: for i in range(10000):
....: R = srange(M)
....: gc.collect()
....: print("memory usage 10k:", get_memory_usage(mem))
....: mem = get_memory_usage()
....: for i in range(20000):
....: R = srange(M)
....: gc.collect()
....: print("memory usage 20k:", get_memory_usage(mem))
353
0
memory usage 10k: 0.5
0
memory usage 20k: 0.0
on https://groups.google.com/g/sage-devel/c/K4EQiwyIRHQ/m/KzkiondSAQAJ there are confirmations that the problem also exists on Arch linux and the non cocalc enhanced version of sage.
Component: basic arithmetic
Issue created by migration from https://trac.sagemath.org/ticket/31511