Simon Riggs <simon@2ndquadrant.com> writes:
> If I/O is a problem, then surely you will agree that PreAllocXLog is
> still required and should not be run by a backend?
It is still required, but it isn't run by backends --- it's fired off
during checkpoints. I think there was some discussion recently about
making it more aggressive about allocating future segments; which
strikes me as a good idea.
regards, tom lane
