On Mar 16, 2007, at 12:38 PM, Rainer Toebbicke wrote:
Derrick J Brashear wrote:
On Fri, 16 Mar 2007, Robert Banz wrote:
The following patch adds the options "-nofsync" to the namei-
based fileserver and volserver, disabling fsync() operations.
For the volserver, local tests have shown that this speeds up
volume moves significantly.
If it's like the one Rainer sent it also breaks things. Ask Harald
Barth.
Well, I seeing that it got dropped from CVS I checked with Harald
and he himself does not think so any longer. He must have had some
other problem. The necessity for syncs (except crashes) also
somehow contradicts POSIX to my understanding.
We run with a variant of mine which nevertheless does syncs in a
separate thread for safety since years now and could frankly not do
without. However better programmers than me aren't rare and
delaying the syncs is not a very tricky task.
My theory with the fsync thing, is that the OS is going to flush
dirty stuff to disk anyhow. So, I figure to just let it do that and
not try to implement a bunch of code to flush'm when something else
should be doing it for me.
-rob
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