| From: | Michal Mosiewicz <mimo(at)interdata(dot)com(dot)pl> |
|---|---|
| To: | The Hermit Hacker <scrappy(at)hub(dot)org> |
| Cc: | hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] fsync -> fdatasync in backend/storage/file/fd.c |
| Date: | 1998-04-17 01:53:03 |
| Message-ID: | 3536B5FF.6AE07DCA@interdata.com.pl |
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| Thread: | |
| Lists: | pgsql-hackers |
The Hermit Hacker wrote:
> We don't have it (FreeBSD)...what does it do? *raised eyebrow*
> And, how many ppl actually have fsync's enabled?
When you fsync a file it usually costs at least two write operations,
one to write the data and one to update modification/access date, etc.
fdatasync synces only data area of the file without it's
metainformation.
It's not a Linux-only feature. In fact, I'm really not sure if it's
already implemented in Linux (the man page I've got states that in
2.0.23 it was a mere fsync alias) It is a part of POSIX1b standard.
Mike
--
WWW: http://www.lodz.pdi.net/~mimo tel: Int. Acc. Code + 48 42 148340
add: Michal Mosiewicz * Bugaj 66 m.54 * 95-200 Pabianice * POLAND
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