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Top Forums UNIX for Advanced & Expert Users About efficiency of parallel memory allocation Post 303006401 by jim mcnamara on Wednesday 1st of November 2017 06:10:15 PM
Old 11-01-2017
Do you understand virtual memory versus physical memory? When a process asks for memory, especially huge chunks of it, one common strategy is to allocate a small part of it and then mark virtual memory (which is on disk usually) as allocated for the rest of the request.

See
Code:
free
swapon -s

 

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curs_memleaks(3X)														 curs_memleaks(3X)

NAME
_nc_freeall _nc_free_and_exit - curses memory-leak checking SYNOPSIS
#include <curses.h> void _nc_freeall(void); void _nc_free_and_exit(int); DESCRIPTION
These functions are used to simplify analysis of memory leaks in the ncurses library. They are normally not available; they must be con- figured into the library at build time using the --disable-leaks option. That compiles-in code that frees memory that normally would not be freed. Any implementation of curses must not free the memory associated with a screen, since (even after calling endwin), it must be available for use in the next call to refresh. There are also chunks of memory held for performance reasons. That makes it hard to analyze curses ap- plications for memory leaks. To work around this, one can build a debugging version of the ncurses library which frees those chunks which it can, and provides these functions to free all of the memory allocated by the ncurses library. The _nc_free_and_exit function is the preferred one since some of the memory which is freed may be required for the application to continue running. Its parameter is the code to pass to the exit routine. RETURN VALUE
These functions do not return a value. PORTABILITY
These functions are not part of the XSI interface. SEE ALSO
curses(3X). curs_memleaks(3X)
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