# 1.runtime_mongos is settings of "replicaSet": "bapi", "readPreference": "secondaryPreferred"
# 2.I run the flow test, found the mem_usage increase a lot.(1.428GiB / 8GiB) the db has about 10+M data.
table = motor_asyncio.AsyncIOMotorClient(**settings.runtime_mongos)["name"]["Table"]
loop = asyncio.get_event_loop()
async def test():
    cnt = 0
    while True:
       task_ls = await table.find().sort([
 (cls.COL_PRIORITY, pymongo.ASCENDING),
 (cls.COL_START_UTS, pymongo.ASCENDING),
]).to_list(None)
        print(len(task_ls))
        await asyncio.sleep(1)
        cnt += 1
        if cnt > 50:
            gc.collect()
            cnt = 0
loop.run_until_complete(test())