> > As part of checkpoint, we discard some WAL files.  To do that, we must
> > first be sure that all the dirty buffers we have written to the kernel
> > are actually on the disk.  That is why the sync() is required.
> What we really need is something better than sync(), viz flush all dirty
> buffers to disk *and* wait till they're written.  But sync() and sleep
> for awhile is the closest portable approximation.

Are you saying that fsync() might not wait untill the IO completes?
Tatsuo Ishii

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