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Actually, as I mentioned, /tmp is (AFAIK) everywhere a tmpfs mount, which means these files are kept in RAM and stored to disk only if their pages are swapped.

/tmp is typically but not always a tmpfs mount. Presumptions about where files are or aren't actually written to disk given modern virtual memory is ... somewhat fraught.

It also happens that my /tmp is physically allocated.

And named pipes really and truly work differently (though there can still be buffering).

That said, no joy (though I tracked down the issue above -- configfile setting conflicting with commandline parameters, somewhat annoyingly).

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