Memory usage go high when running sonicd

[ChanHongMing]

I made a docker-compose myself and run the sonic node for opera mainnet. The memory usage seems keep increasing overtime, maybe there is memory leak somewhere?
docker-compose.yaml
`version: '3.8'

services:
ftm-sonic-validator-start:
image: official-sonic
entrypoint: ["sonicd", "--cache", "65000", "--http", "--http.api", "eth,debug,net,web3,personal,txpool,ftm,dag", "--http.addr", "0.0.0.0","--http.corsdomain", "", "--http.port", "18545", "--ws", "--ws.api", "eth,debug,net,web3,personal,txpool,ftm,dag", "--ws.addr", "0.0.0.0", "--ws.port", "19545", "--ws.origins", "", "--datadir", "/db"]
ports:
- "18545:18545"
- "19545:19545"
volumes:
- ./db:/db
environment:
- TZ=UTC
`
The following is the mem usage of the docker container