Flat or segmented buffer?

Describes the occasions you should choose a flat buffer and when to choose a segmented buffers.

The choice between using an array implemented with a flat buffer against using an array implemented with a segmented buffer depends on the characteristics of the application.

Choose a flat buffer:

• if efficiency in transforming between buffer position and memory address is very important.

• if the re-allocations needed to extend the buffer are sufficiently rare that they do not cause intolerable amounts of data copying or heap fragmentation.

• if there is an upper bound on the size limit and can reserve sufficient room before inserting elements.

Choose a segmented buffer:

• to minimise the heap thrashing and copying that can be associated with reallocating a single flat buffer.

• if the performance of frequent insertions and deletions is a concern. This can be better with segmented buffers, because not all data after the insertion/deletion point needs to be shuffled to complete the operation.