Is there any benefit to using memory mapping for a sequential file?

Question

I have an application in which I process a file exclusively sequentially in Java. The file is opened, viewed once and then closed.

Currently, I use only File Channel. It is possible to display a memory card. Will there be any advantage to this?

Answer 1

This question has to do something with the hardware level.

There is no advantage if the file is processed sequentially. If the file is processed by matching, there is an additional memory loss, allocating memory to other functions (variables, etc.) Compared to sequential processing. The role of memory management is carried out according to a principle called

Principle of locality

Programs tend to reuse data and instructions that are close to each other or recently used.

• Temporary locality

  • In the near future, the links to which the links link may be indicated in the near future
  • As a rule, the block is accessed repeatedly

• Spatial locality

  • Items with nearby addresses are typically referenced close together in time.
  • Access to blocks is usually available.

let me give you an example

sum = 0; int array[] = new int[10]; for (int i = 0; i < array.length; i++){ sum += array[i]; } 

Data

• Accessing Array Elements in Sequential Order - Spatial Locality
• The base amount of each iteration - Temporal locality

Instruction manual

• Reference instructions sequentially - Spatial locality
• Repeat Loop - Temporary Locality

Let us return to the question, since the data in the file is written in an ordered manner in memory (for example, in an array), there is no advantage in comparing, since this is performed by spatial locality, as I described earlier.