On 04/27/2017 08:59 AM, Andres Freund wrote:
Ok, based on the, few, answers I've got so far, my experience is indeed
skewed. A number of the PG users I interacted with over the last couple
years had WAL write ranges somewhere in the range of 500MB/s to 2.2GB/s
(max I'veseen). At that point WAL insertion became a major bottleneck,
even if storage was more than fast enough to keep up. To address these
we'd need some changes, but the feedback so far suggest that it's not
yet a widespread issue...
I would agree it isn't yet a widespread issue.
The only people that are likely going to see this are going to be on
bare metal. We should definitely plan on that issue for say 11. I do
have a question though, where you have seen this issue is it with
synchronous_commit on or off?
Thanks,
JD
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