cache.py 文件源码

def remove_oldest_entries(storage, percentage=90):
    # compute current memory usage (%)
    old_mem = psutil.virtual_memory().percent
    # if we have data in storage and utilization exceeds 90%
    while storage and old_mem > percentage:
        # removed oldest entry
        storage.popitem(last=False)
        # garbage collect
        gc.collect(1)
        # comute used memory again
        new_mem = psutil.virtual_memory().percent
        # if the used memory did not decrease stop
        if new_mem >= old_mem:
            break
        # net new measurement for memory usage and loop
        old_mem = new_mem