Per some earlier discussion, here is an attempt at implementing a "delayed write" of the pgstats file, to decrease the write activity on that file.
It changes so the file is only written once every 5 minutes (changeable of course, I just picked something) instead of once every half second. It's still written when the stats collector shuts down, just as before. And it is now also written on backend request. A backend requests a rewrite by simply sending a special stats message. It operates on the assumption that the backends aren't actually going to read the statistics file very often, compared to how frequent it's written today. //Magnus
pgstat_delay.patch
Description: pgstat_delay.patch
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