On 09/07/2010 09:06 AM, Heikki Linnakangas wrote:
> Setting a latch that's already set is very fast, so you want to keep it
> set until the last moment. See the coding in walsender for example, it
> goes to some lengths to avoid clearing the latch until it's very sure
> there's no more work for it to do. That helps to keep the overhead in
> backends committing transactions low. (no-one has tried to measure that
> yet, though)
Understood, thanks.
Markus