On Nov 27, 2006, at 8:41 AM, Kevin Oberman wrote:
As far as I know, that's not different from calling "sync"
just once. It might make more sense to put a little sleep
between the sync calls, though.
The traditional mantra was
sync
sync
sync
and not sync;sync;sync. The reason was timing. By entering the sync
command three times as fast as anyone could type, the sync could
reliably complete.
Agreed. Although I've heard rumors that some systems treated 3 syncs
as some sort of special case, but I've never seen anything in code to
support the notion.
That mantra is about 25 years old, so its validity on modern
hardware is
questionable, but the need for a delay is very real. I would suggest
something like: sync && sleep 5
The other choice would be to make sync [or the sync(2) system call,
more precisely] blocking, so that it does not return until the buffer
cache has been flushed and all dirty pages in VM have been written to
disk.
--
-Chuck
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