> Victor, please read your own link before posting:

Oh. I missed this part, that's why I didn't understand Tim's remark.

So the issue comes the Windows heap allocator. I don't see any obvious improvment that Python can do to improve the memory usage. I close the issue.

You have to modify your application to allocate objects differently, to limit manually the fragmentation of the heap. Another option, maybe more complex, is to create a subprocess to process data, and destroy the process to release the memory. multiprocessing helps to implement that.

I will maybe try jemalloc on Windows, but I prefer to open a new issue if I find something interesting.