1) The scheduler and instance concurrency is set to improve - meaning
less instances anyway - to do the same workload.
2) If you doing a regular job, then reserved instances would most
likely save you money.
(And another possible, with Backends, could perhaps use a more
powerful instance to zip though tasks even quicker)
(or the shorter answer - this is still all based on speculation of the
new system, don't make decisions yet)
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I don't think so. Although reserved instance hours cost less, you pay
for hours you don't use as well as those you do. Your average price
only approaches the reserved price if you use every single hour.
Reserved instance hours are a bad fit for bursty map-reduce type jobs.
I expected prices to decrease. After 3 years of Moore's Law, why would
it cost more?