Program uses twice as much memory in Python 3.6 than in Python 3.5

Chris Angelico rosuav at
Wed Mar 29 23:31:13 EDT 2017

On Thu, Mar 30, 2017 at 2:19 PM, Rick Johnson
<rantingrickjohnson at> wrote:
> On Wednesday, March 29, 2017 at 8:17:01 PM UTC-5, Jan Gosmann wrote:
>> On 29 Mar 2017, at 20:12, Steve D'Aprano wrote:
>> > If you can demonstrate this effect using simple example
>> > code without the external dependencies (using nothing but
>> > the standard library) and people can replicate it, I think
>> > it should be reported as a bug.
>> I probably won't be able to demonstrate the effect with
>> simple example code because I haven't the slightest idea
>> what is causing it. Also, I'm not sure how much more time I
>> want to invest in this. After all it is a problem that
>> might never get noticed by any users of the software.
> Really? How could your clients not notice 60 GB of memory
> usage unless they are running some kind of mad-dog insane
> top-of-the-line hardware? (Got Benjamins???) Of course, in
> the case they are not DARPA scientist supported by a
> viturally unlimited supply of tax dollars provided by the
> endless toils of American slave-bots, how could they ignore
> the thrashing? o_O

Did you read the project's README? This is a dramatic reduction from
the normal memory usage of this kind of job. So, yes, they *are* going
to have top-of-the-line hardware. If you're doing a job that normally
would require 256GB of RAM, and instead of being able to run in 40GB,
it needs 60GB, are you going to notice? You probably have 64GB or


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