bitcoin core 0.16.3: high resource usage,

[ajeeshb]

One week before I was running 0.12.0 version is running and now it is upgraded to 0.16.3 and found to be high CPU and disk IO consuming for real bitcoin network. But for the Testnet it is running normal resource usage.

The real bitcoin network is running with the following options
  exec start-stop-daemon \
    --start \
    --pidfile "$BITCOIND_PIDFILE" \
    --chuid $BITCOIND_USER:$BITCOIND_GROUP \
    --exec "$BITCOIND_BIN" \
    -- \
    -pid="$BITCOIND_PIDFILE" \
    -conf="$BITCOIND_CONFIGFILE" \
    -datadir="$BITCOIND_DATADIR" \
    -daemon \
    -debug=prune

And Testnet is with the following option

-daemon -testnet -reindex

[LTU_btc]

Haven't you tried to upgrade your Bitcoin Core to 0.17.0? It's newest version available right now. I'm not very familiar with Bitcoin Core, so I can't suggest anything better.
P.S Discussions about Bitcoin Core belongs to Bitcoin Technical support board, not beginners and help. So I think it would be better to move your thread to that board