trace_replayBlockTransactions used too much memory

[forencen]

hello. I met a problem.
when I use 200 tiems trace_replayBlockTransactions rpc method , openethereum-linux-v3.0.1 will use too much memory：

config.toml:

[parity]

mode="active"
chain = "mainnet"
base_path = "/data/chaindata"

light = false
no_persistent_txqueue = true



[rpc]

disable = false

port = 39842

interface = "0.0.0.0"

cors = ["*"]

apis = ["all"]

hosts = ["all"]

server_threads = 1000

[websockets]

disable = false
port = 39843
interface = "local"
origins = ["all"]

# 浏览器的origin header

apis = ["all"]
hosts = ["all"]

[network]

port = 30303
min_peers = 3
max_peers = 6
snapshot_peers = 0
warp = true
max_pending_peers = 64

[mining]
# Parity will keep/relay at most 32768 transactions in queue.
tx_queue_size = 32768
# Maximum number of transactions per sender in the queue. By default it's 1% of the entire queue, but not less than 16.
tx_queue_per_sender = 8192
# Prepare a block to seal even when there are no miners connected.
force_sealing = true


[footprint]
cache_size = 10240
db_compaction = "ssd"
fast_and_loose = false


[misc]
logging = "own_tx=trace"
log_file = "/var/log/parity.log"
color = true

for block_number in range(4000000, 5000000):
    logger.info(block_number)
    payload = {"jsonrpc": "2.0", "method": "trace_replayBlockTransactions",
               "params": [hex(block_number),  ["trace"]], "id": 1}
    headers = {
        'Content-Type': 'application/json'
    }
    response = requests.request("POST", url, headers=headers, json=payload)
    data = response.json()
    result = data.get('result') or None

The important thing is that when I close the python program, the memory does not drop

Can I limit the memory usage of ethvm？