On 11/30/17 23:35, Thomas Munro wrote: > On Fri, Dec 1, 2017 at 5:04 PM, Justin Pryzby <pry...@telsasoft.com> wrote: >> On Fri, Dec 01, 2017 at 04:01:24PM +1300, Thomas Munro wrote: >>> Hi hackers, >>> >>> The manual implies that only Linux can use huge pages. That is not >>> true: FreeBSD, Illumos and probably others support larger page sizes >>> using transparent page coalescing algorithms. On my FreeBSD box >>> procstat -v often shows PostgreSQL shared buffers in "S"-flagged >>> memory. I think we should adjust the manual to make clear that it's >>> the *explicit request for huge pages* that is supported only on Linux >>> (and hopefully soon Windows). Am I being too pedantic? >> >> I suggest to remove "other" and include Linux in the enumeration, since it >> also >> supports "transparent" hugepages. > > Hmm. Yeah, it does, but apparently it's not so transparent. So if we > mention that we'd better indicate in the same paragraph that you > probably don't actually want to use it. How about the attached?
Part of the confusion is that the huge_pages setting is only for shared memory, whereas the kernel settings affect all memory. Is the same true for the proposed Windows patch? -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
