With 8GB of physical RAM it might be better to move the comments-rocksdb-storage back to a regular drive from the ramdisk, but it's hard to tell without testing. The physical size of shared memory plus the comments db is about 10GB.
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Could be, I've tested it, but on machines with bigger amount of RAM. As long as the kernel has enough memory you don't even need to explicitly tie shared_memory.bin to RAM, as it will handle cache pretty well. As for the rocksdb (both account history in case of exchanges, and comments for all the nodes), it usually makes a better use of that memory than "wasting" it for database storage. To a large extent it depends on a performance ratio between RAM and storage.
Interesting. I'm seeing 4.1G for comments (and more for shared_memory but I have a few extra plugins so that's explainable). Not sure why.