I just want to point out the possibility that your Racket web app
might not be CPU-bound. Some "generic" web sites are IO-bound. Blocked
on IO for the HTTP requests and responses. Blocked on IO talking to a
database server like Postgres.

In cases like that, you might not need more than one process. (Indeed
you might even get away with running on a t2.micro instance, which
throttles horribly after a short CPU burst, because you never come
close to that threshold even under your maximum traffic loads.)

It's a real possibility you might want to measure/see, first. Of
course it depends on how much work your Racket web app does (itself,
not farmed out to DB or other out-of-process servers), as well as on
the traffic loads you expect.

Having two or more servers might be convenient for non-load reasons.
For updates (to let the old "drain" as you described, or blue/green
deploys, etc.).  Or for fail-over (although I'm not sure 2 procs on
same box is the way to go, if you even really need many 9s (many sites
really don't if we're being honest with ourselves)).

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