Introduce Mmapped buffers and Merge Sort #194
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manishrjain
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all-seeing-code,
karlmcguire and
martinmr
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jarifibrahim
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Sep 22, 2020
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Buffers can now be mmapped as well as Calloc'd. This PR also copies over all the mmap files from Badger to allow mmap support in various platforms.
This PR also introduces Merge Sort to do sorting of the buffer using an extra temporary space costing half of the space as the original buffer, currently allocated on Calloc. We can't use quick sort. Each entry is variable length, so we can't just swap them in the buffer. Merge Sort allows us to iterate over them linearly, hence is a better fit.
This change is