On Fri, Jan 16, 2015, at 03:40, Tom Ivar Helbekkmo wrote:
What this means is that the second sync, by waiting
for its own
superblock writes, will wait until all the inode and file data flushes
scheduled by the first one have completed.
Everything I've read indicates that nothing in the sync call actually
waits on anything, and that it's actually just the time taken to type
the second and third command on a 110 baud terminal gives the first one
time to finish executing.