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What are the advantages of doing memory mapped IO?

+1 vote
What are the advantages of doing memory mapped IO?
posted Jan 2, 2015 by Syed

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+1 vote

In the following example

int  main()
  char *ptr ="shakti";

Where does ptr get memory? IN data segment or in stack or code segment ?
Please clarify.

+3 votes

I am using gprof on an HP-UX system for a program compiled with HP's native aCC (using the -G option, which is documented as compatible with gprof).

I get this every time I run gprof on even a small sample gmon.out:

$ gprof  gmon.out > gprof.out    
gprof: out of memory allocating ********** bytes after a total of 15552512 bytes

This works on other HPs we have in house, though I don't have access to them to be able to track down why.

Any clues that might point me in the right direction?

4,294,967,256 seems like an awful lot of memory to handle a 8,647,174 byte gmon.out file....