Jeff Davis 269e780822 Use posix_fallocate() for new WAL files, where available. ...

This function is more efficient than actually writing out zeroes to
the new file, per microbenchmarks by Jon Nelson. Also, it may reduce
the likelihood of WAL file fragmentation.

Jon Nelson, with review by Andres Freund, Greg Smith and me.

2013-07-05 12:30:29 -07:00

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