We've had a surprising amount of difficulty maintaining this over the years, since FreeBSD's NFSv4 implementation kind of sucked for a while, and it doesn't support mounting a memory partition (tmpfs). But you can trick it by mounting the memory partition using nullfs, and then nfsmount-ing that.
We used that memory-partition-over-network thing for a while, but actually switched to SSD-over-network because it was faster than the memory partition. I spoke with a FreeBSD maintainer about it and he said what we were doing was so unsupported/unoptimized that he wasn't surprised.
We run into weird FreeBSD edge cases pretty often where there are few people, if anyone, who can answer our questions. Sometimes I wish we'd gone with Linux, but after ten years the hassle of switching doesn't seem worth it. Thankfully 9.2-RELEASE has been pretty good to us.
Have you considered memcached with nginx HttpMemcachedModule? If so, why didn't you decide to use that instead? Seems like all of 4chan's active posts could easily fit in memory of server with a moderate amount of ram (especially if compressed).
We used that memory-partition-over-network thing for a while, but actually switched to SSD-over-network because it was faster than the memory partition. I spoke with a FreeBSD maintainer about it and he said what we were doing was so unsupported/unoptimized that he wasn't surprised.
We run into weird FreeBSD edge cases pretty often where there are few people, if anyone, who can answer our questions. Sometimes I wish we'd gone with Linux, but after ten years the hassle of switching doesn't seem worth it. Thankfully 9.2-RELEASE has been pretty good to us.