lmtpd triggering a delivery.db checkpointing (Cyrus 2.3.16)

[Simon Matter]

> Hi,
>
>
> Several times a month our server freezes up on deliveries and the system
> load average shoots up into the hundreds. Things quickly return to normal
> between one and two minutes later but this has always puzzled me.
>
> Today I was watching the system from up close when it happened.
>
>
> May 17 10:59:14 XXXX lmtp[24980]: skiplist: checkpointed
> /ssd/cyrs/imap/deliver.db (223062 records, 25295200 bytes) in 119 seconds
>
>
>
> I took a quick dive into the code but could not find where and when lmtpd
> is supposed to trigger a delivery.db checkpointing action.

Isn't it controlled by 'checkpoint    cmd="ctl_cyrusdb -c" period=30' in
cyrus.conf?

Simon