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Add documentation about dbcache. 

Adapted from documentation 'Reducing bitcoind memory usage' by @laanwj
https://gist.github.com/laanwj/efe29c7661ce9b6620a7
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Simon 2018-01-17 16:55:26 -08:00
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In-memory caches
----------------
The size of some in-memory caches can be reduced. As caches trade off memory usage for performance, usually reducing these have a negative effect on performance.
- `-dbcache=<n>` - the UTXO database cache size, this defaults to `450` (`100` before 1.0.15). The unit is MiB (where 1 GiB = 1024 MiB).
- The minimum value for `-dbcache` is 4.
- A lower dbcache make initial sync time much longer. After the initial sync, the effect is less pronounced for most use-cases, unless fast validation of blocks is important such as for mining.