BUBT: Sizing requirements

[prataprc]

Sizing requirements need to be presented for.

• CPU
• Memory
• DISK

[prataprc]

CPU requirement:

While building, for each file used for building the index one go-routine shall be spawned. Each of these go-routine will be IO-bound.

Snapshots don't use any extra go-routine, but can be shared with any many go-routines as possible.

Memory requirement:

Few mega-bytes are allocated while building the index.

Disk amplification:

If optimal zblocksize, vblocksize and mblocksize arguments are used while building the index, we can expect around 2x disk amplification with respect to payload, especially for small key,value entries.

Write amplification:

Directly propotional to disk-amplification.