> Actually ... take a close look at the code. The delay is done in
> xact.c between XLogInsert(commitrecord) and XLogFlush(). As near
> as I can tell, both the write() and the fsync() will happen in
> XLogFlush(). This means the delay is just plain broken: placed
> there, it cannot do anything except waste time.
I see. :-(
> Another thing I am wondering about is why we're not using fdatasync(),
> where available, instead of fsync(). The whole point of preallocating
> the WAL files is to make fdatasync safe, no?
I don't have fdatasync() here. How does it compare to fsync().
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
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