Re: More Slowdown

["evilninja@gmx.net" <evilninja@gmx.net>]

Francesco Biscani schrieb:
> What are the implications of doing something like this? Is "sync" going to 
> stop working or isn't it using this function?

sync(8) won't stop working, because it's using sync(2):

% strace -T sync 2>&1 | grep sync
execve("/bin/sync", ["sync"], [/* 20 vars */]) = 0
sync()                                  = 0 <0.213305>


...but can someone explain to me: what's the difference between sync(2) 
and fsync(2) ? why are there 2 systemcalls, why is fsync(2) expensive 
and (mis?)used so often by applications and sync(2) is cheap (not?) and 
used only by sync(8)? the manpages say:

fsync, fdatasync -
	synchronize a file's complete in-core state with that on disk

sync -
	commit buffer cache to disk

but both syscalls do not guarantee  data  integrity anyway, because 
"modern disks have large caches".

thank you,
Christian.
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