please eat my data!

[Dirk Hohndel]

On Mon, 12 Apr 2010 10:14:05 -0700, Stewart Smith <stewart at flamingspork.com> wrote:
> On Mon, 12 Apr 2010 17:24:35 +0200, "Sebastian Spaeth" <Sebastian at SSpaeth.de> wrote:
> > What I find intersting is that we have a 2x speedup and a 10x speedup
> > for different queries. Olly was saying on IRC that both *should* really be
> > behaving in much the same manner.
> 
> Remember that on ext3 (and pretty sure ext4) fsync is the same as
> sync(). So performance depends on how much dirty data you have in your cache.
> 
> libeatmydata also gets rid of msync(), O_SYNC etc as well.

Which is why so many of us have started to use BTRFS...

Much smaller performance degradation when doing frequent fsync's

/D

-- 
Dirk Hohndel
Intel Open Source Technology Center