import random
import time
from threading import Lock, Thread
import psutil
class Cache:
    def __init__(self, cap):
        self.m = {}
        self.mu = Lock()
        self.cap = cap
    def get(self, key):
        with self.mu:
            try:
                v = self.m[key]
            except KeyError:
                return 0, False
            return v, True
    def set(self, key, value):
        with self.mu:
            self.m[key] = value
            if len(self.m) > self.cap:
                self.m.popitem()
def set_key(cache):
    c = 0
    while True:
        key = random.randint(0, 1000000000)
        cache.set(key, key)
        c += 1
        if c  == 100000:
            c = 0
            print(".", end="", flush=True)
def run():
    cache = Cache(500000)
    for _ in range(4):
        thread = Thread(target=set_key, args=[cache])
        thread.start()
    process = psutil.Process()
    while True:
        time.sleep(10)
        with cache.mu:
            print(f"rss: {process.memory_info().rss}, dict len: {len(cache.m)}")
if __name__ == "__main__":
    run()

uv run --python 3.13.3t mem.py
............................................................rss: 384696320, dict len: 500000
.......................................................rss: 636743680, dict len: 500000
.......................................................rss: 888782848, dict len: 500000
.........................................................rss: 1140793344, dict len: 500000
......................................................rss: 1392799744, dict len: 500000

uv run --python 3.13.3 mem.py
....................................................................................................rss: 159633408, dict len: 500000
...............................................................................................................rss: 159813632, dict len: 500000
.........................................................................................................rss: 159981568, dict len: 500000
...........................................................................................................rss: 160149504, dict len: 500000
......................................................................................................rss: 160301056, dict len: 500000