Bruce Momjian <pgman@candle.pha.pa.us> writes:
> The trick is to somehow record all files modified since the last
> checkpoint, and open/fsync/close each one. My idea is to stat() each
> file in each directory and compare the modify time to determine if the
> file has been modified since the last checkpoint.
This seems a complete non-starter, as stat() generally has at best
one-second resolution on mod times, even if you assume that the kernel
keeps mod time fully up-to-date at all times. In any case, it's
difficult to believe that stat'ing everything in a database directory
will be faster than keeping track of it for ourselves.
regards, tom lane