When you say 8000 concurrent visitors, is that per site or across the 70 installs? And what sorts of sites were they?

Because there's an immense difference when it comes to hosting between a blog/brochure site that is fully cachable and a woocommerce or, worse, social network/LMS/other highly dynamic site.

To be clear though, I'm not advocating for distributed cloud architecture - that sort of stuff is best done on a vertically-scaled server, which can get up to many hundreds of CPUs these days.

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camillomiller a day ago | parent [-]

They where dynamic publishing sites, so not supercomplicated and absolutely cached to the brim. A big chung of the concurrent visitors (prob like 90%) where on two websites, so two installs.

	▲	nchmy a day ago \| parent [-]
		Ok. Yeah, you could easily have 100k concurrent visitors with that, if the request isn't actually reaching php/WordPress. On e it does, you're down to something like 2-4, maybe 10, requests per cpu core, per second. Depends on the hardware and how the site is configured.