Now go back up to the top and change a set of bytes in the middle of the first chunk with the offsets of the various chunks. Tell me how fast that is.
FWIW (which is not much), I did a simple test comparing:
a) Streaming a file into byte[] chunks each 512 bytes long, then iterating
over the entire list of chunks and reading each one as 128
little-endian ints.
b) Memory mapping the entire file, setting order = LITTLE_ENDIAN, and
reading entire file int by int.
For a 50 MB file, (a) takes ~1350 ms and (b) takes ~550 ms.
-Andy
I agree that saving 800 ms isn't that great, but as a bonus you also
save 50 MB of RAM! :)
-Chris
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