[Python-Dev] Opcode cache in ceval loop

[Victor Stinner]

2016-02-02 20:23 GMT+01:00 Yury Selivanov <yselivanov.ml at gmail.com>:
> Alright, I modified the code to optimize ALL code objects, and ran unit
> tests with the above tests excluded:
>
> -- Max process mem (ru_maxrss)     = 131858432
> -- Opcode cache number of objects  = 42109
> -- Opcode cache total extra mem    = 10901106

In my experience, RSS is a coarse measure of the memory usage. I wrote
tracemalloc to get a reliable measure of the *Python* memory usage:
https://docs.python.org/dev/library/tracemalloc.html#tracemalloc.get_traced_memory

Run tests with -X tracemalloc -i, and then type in the REPL:

>>> import tracemalloc; print("%.1f kB" % (tracemalloc.get_traced_memory()[1] / 1024.))
10197.7 kB

I expect this value to be (much) lower than RSS.

Victor