Do I need to manually reset the mempool once in a while?

[johnyj]

http://bitcointicker.co/networkstats/
You can see from this site, for more than 10 days, the mempool size steadily grew beyond 80MB, and the operator did a restart of the process, then it start to build from 0 again



But why does the mempool grow linearly forever? On other sites like tradeblock I did not see this phenomenon

[johnyj]

Currently my mempool is reaching 200+MB and there is no sign of stop growing

~$ btc getmempoolinfo
{
"size" : 17116,
"bytes" : 205076565
}