Re: 8.4 Performance improvements: was Re: Proposal of tunable fix for scalability of 8.4 - Mailing list pgsql-performance

From Alan Stange
Subject Re: 8.4 Performance improvements: was Re: Proposal of tunable fix for scalability of 8.4
Date
Msg-id 49BA79A4.9030208@rentec.com
Whole thread Raw
In response to Re: 8.4 Performance improvements: was Re: Proposal of tunable fix for scalability of 8.4  (Gregory Stark <stark@enterprisedb.com>)
Responses Re: 8.4 Performance improvements: was Re: Proposal of tunable fix for scalability of 8.4  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-performance
Gregory Stark wrote:
> A minute ago I said:
>
>  AFAIK Opensolaris doesn't implement posix_fadvise() so there's no benefit. It
>  would be great to hear if you could catch the ear of the right people to get
>  an implementation committed. Depending on how the i/o scheduler system is
>  written it might not even be hard -- the Linux implementation of WILLNEED is
>  all of 20 lines.
>
> I noticed after sending it that that's slightly unfair. The 20-line function
> calls another function (which calls another function) to do the real readahead
> work. That function (mm/readahead.c:__do_page_cache_readahead()) is 48 lines.
>
>
It's implemented.   I'm guessing it's not what you want to see though:

http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/posix_fadvise.c



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