Today in complicated things are complicated...

My server, despite its 64Gb RAM being way more than it needs most of the time, is experiencing sporadic OOMs despite reporting plenty of available (not free) memory.

It only happens when downloading particularly large Linux ISOs in the P2P style, during download, and most especially on completion when copying from SSD to HDD.

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My current theory is that the issue lies somewhere in the confluence of three things...

* libtorrent uses memory maps files
* I'm in the habit of using zram swap, for in-memory compressed swap, with the defaults, so up to 32Gb (pre-compression) can be stored here
* I recently switched from btrfs to ZFS, with the default 50% host memory ARC cache

I didn't see this behaviour before the switch to ZFS, so perhaps I need to tune some things here?

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#linux #zfs

@jon @stephen the 4-day week affords us that much more time to break our own computers in new and interesting ways

@jon and that reminds me, I've not had my first coffee of the day yet. Maybe it'll all make sense after that.

@pikesley @stephen and let’s face it, we’d have it no other way.