Hello, On Tue, 31 Mar 2020 07:40:01 +1100 Chris Angelico <ros...@gmail.com> wrote:
> On Tue, Mar 31, 2020 at 7:04 AM Paul Sokolovsky <pmis...@gmail.com> > wrote: > > for i in range(50000): > > v = u"==%d==" % i > > # All individual strings will be kept in the list and > > # can't be GCed before teh final join. > > sz += sys.getsizeof(v) > > sb.append(v) > > s = "".join(sb) > > sz += sys.getsizeof(sb) > > sz += sys.getsizeof(s) > > print(sz) > > > > > ... about order of magnitude more memory ... > > I suspect you may be multiply-counting some of your usage here. Rather > than this, it would be more reliable to use the resident set size (on > platforms where you can query that). I may humbly suggest a different process too: get any hardware board with MicroPython and see how much data you can collect in a StringIO and in a list of strings. Well, you actually don't need a dedicated hardware, just get a Linux or Windows version and run it with a specific heap size using a -X heapsize= switch, e.g. -X heapsize=100K. Please don't stop there, we talk multiple implementations, try it on CPython too. There must be a similar option there (because how otherwise you can perform any memory-related testing!), I just forgot which. The results should be very apparent, and only forgotten option may obfuscate it. [] -- Best regards, Paul mailto:pmis...@gmail.com _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/ZWKHUVQUMTUIGKXHGXG2AA3F35VUD2Y4/ Code of Conduct: http://python.org/psf/codeofconduct/
