I'm not sure an in-memory solution will work because of parallel processing.
Hm. The primary reason -- there are others -- for using parallel processing is: speed.
I pretty much guarantee that you will not be able to achieve 500/s using a disk-based file or DB let alone 5000/s; -- disk access is at least 100,000 times slower than memory -- which means you now need 10 processors instead on one just to get back to par.
And if 5000/s isn't enough? Put the bitmaps in shared memory (NOT threads::shared) and run multiple threads...
Anyway, good luck with the project which ever way you choose to go :)
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