[knot-dns-users] Memory usage sky rockets

Hi, I've got a staging environment running, with two signers signing a staging version of the .is zone (~115k records). The staging servers are configured with 2 GB RAM and 4 CPU cores, running on FreeBSD 12.2. We've experienced that knot crashes because the server runs out of memory. The zone is configured with: zonefile-sync: -1 zonefile-load: difference-no-serial journal-content: all One of the signers, after an hour of running is showing 215 MB resident memory used. The other signer, that's been running for a whole day is showing 1582 MB resident memory. I attached a screenshot showing the amount of memory used over a period of time, and the graph shows that the amount of memory used very suddenly increases. I assume the servers are using a lot of memory for the journals, but I'd like to understand why the sudden increase in used memory, and what to expect about needed memory? .einar