> Yes.  If you were doing multiple WAL writes before transaction fsync,
> you would be fsyncing every write, rather than doing two writes and
> fsync'ing them both.  I wonder if larger transactions would find
> open_sync slower?

Want me to test?   I've got an ide-based test machine here, and the TPCC 

Josh Berkus
Aglio Database Solutions
San Francisco

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