Linux+glibcで何故かメモリ消費が増える現象(Linux+glib)

increase_memory_usage.py

import copy
import os
import random
import subprocess
import tracemalloc

pid = os.getpid()
buffer = b"0" * 100000000


def get_large_object(n):
    s = random.randint(0, 10000)
    e = random.randint(1000000, 30000000)
    b = copy.deepcopy(buffer[s:e])
    return b


def get_rss():
    result = subprocess.run(["ps", "-p", str(pid), "-o", "rss="], stdout=subprocess.PIPE)
    return result.stdout.decode("utf-8").strip()


tracemalloc.start()
print("start", "rss:", get_rss(), "malloc(current, peak):", tracemalloc.get_traced_memory())

for i in range(10):
    for j in range(100):
        b = get_large_object(j)
    print(i, "rss:", get_rss(), "malloc(current, peak):", tracemalloc.get_traced_memory())

while True:
    print("finish", "rss:", get_rss(), "malloc(current, peak):", tracemalloc.get_traced_memory())
    input()