Re: [PATCHES] SRA Win32 sync() code
Tom Lane <tgl@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Bruce Momjian <pgman@candle.pha.pa.us>
Cc: PostgreSQL-patches <pgsql-patches@postgresql.org>, PostgreSQL Win32 port list <pgsql-hackers-win32@postgresql.org>
Date: 2003-11-16T16:58:12Z
Lists: pgsql-hackers
Bruce Momjian <pgman@candle.pha.pa.us> writes: > Tom Lane wrote: >> One reason I like the idea of adopting a sync-when-you-write policy is >> that it eliminates the need for anything as messy as that. > Yes, but can we do it without causing a performance degredation, and I > would hate to change something to make things easier on Win32 while > penalizing all platforms. Having to keep a list of modified files in shared memory isn't a penalty? Seriously though, if we can move the bulk of the writing work into background processes then I don't believe that there will be any significant penalty for regular backends. And I believe that it would be a huge advantage from a correctness point of view if we could stop depending on sync(). The fact that Windows hasn't got sync() is merely another reason we should stop using it. regards, tom lane