Hacker News new | ask | show | jobs
by kwohlfahrt 1085 days ago
It sounds like a lot of the performance issues are TLB-related. Am I right in thinking huge-pages would help here? If so, it's a bit unfortunate they didn't test this in the paper.

Edit: Hm, it might not be possible to mmap files with huge-pages. This LWN article[1] from 5 years ago talks about the work that would be required, but I haven't seen any follow-ups.

[1]: https://lwn.net/Articles/718102/
2 comments
hyc_symas 1085 days ago
Huge pages aren't pageable, so they wouldn't be particularly advantageous for a mmap DB anyway, you'd have to do traditional I/O & buffer management for everything.
link
ori_b 1085 days ago
No, huge pages wouldn't help. They would change when the TLB gets flushed, but the flushes would still be there.
link