> That's what really kills performance, because of the async nature of
> nginx. That's why I'm proposing an option to do the fsync at the end of
> the PUT (or maybe even the whole operation) in a thread(pool).

Then again this way you make it again "asynchronous" (since it is/could be waiting in some thread/pool (forever)).

In general this whole thing reminds me of Linus rant about how ".. the only reason O_DIRECT exists is because database people are too used to it" ..

rr

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