On Thu, Mar 18, 2021 at 6:56 AM Maarten Derickx <m.derickx.stud...@gmail.com>
wrote:
> 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))
>
>
This is in sage 9.1.rc5 running on ubuntu 20.4 on a dell inspiron laptop.
It's an old version of sage but I hope it helps:
sage: 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))
....:
176
0
memory usage 10k: 10.0546875
0
memory usage 20k: 21.3984375
> --
> 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/5882460b-842c-49c4-b33b-fae1c7986db9n%40googlegroups.com
> <https://groups.google.com/d/msgid/sage-devel/5882460b-842c-49c4-b33b-fae1c7986db9n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
--
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/CAEQuuAWGxqRL6QwSzXGzT5MbdjYPWwYZY%3D5%3D3O-nZozZWt7e5Q%40mail.gmail.com.
