Problem 861. Memory Map File: Access and Update

Challenge is to read data from a memory map file and also update the file.

Memory Mapping allows placing large static arrays in virtual memory with good point access times. Minimal consumption of valuable RAM occurs. Medium size TB files can be Mapped on a 64 bit machine. Who has TBs of Hard drive?

With Write Access the Actual file gets data permanently overwritten.

(Note: 8GB logical vector took 60 sec on first large access. Subsequent large accesses returned in msec domain)

Applications include Genome Mapping .

Input: Memory Mapped Variable

Output: Value of location 1

Update location 2 to value of 2


x is variable is [1234  1111  54543  32465]
Change to 2 becomes  [1234  2  54543  32465]
Output location 1 value: 1234

Follow Up Challenge: Busting the Cody 3GB Memory Limit using multiple mapped files.

Solution Stats

40.0% Correct | 60.0% Incorrect
Last Solution submitted on Apr 28, 2024

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers22

Suggested Problems

More from this Author308

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!