array in C program

[cljlk]

How do I determine what the maximum of array I can use in C program?

I have Sun Solaris. How many array I can declare, I know it depends on
memory.

If I have set line[100000] in my C program, how many memory do I need?






Thanks

[Alan Coopersmith]

"cljlk" <cljlk@hotmail.com> writes in comp.unix.solaris:
|How do I determine what the maximum of array I can use in C program?
|I have Sun Solaris. How many array I can declare, I know it depends on
|memory.

You divide the maximum memory your program can allocate by the size
of the array members.

The maximum memory your program can allocate is the smallest number on
this list:
- the total amount of virtual memory (RAM + swap) free at runtime,
minus whatever overhead your program needs to load itself and
set up it's stack (see the "available" number in 'swap -s')
- Approx. 3.9GB if running a 32-bit process on a recent Solaris
- the value of ulimit -d if it's not set to 'unlimited'


|If I have set line[100000] in my C program, how many memory do I need?

100000 times the size of whatever datatype that variable is.
If it's a char, 100000 bytes. If it's an int, 400000 bytes.

--
__________________________________________________ ______________________
Alan Coopersmith [email]alanc@alum.calberkeley.org[/email]
[url]http://www.CSUA.Berkeley.EDU/~alanc/[/url] aka: [email]Alan.Coopersmith@Sun.COM[/email]
Working for, but definitely not speaking for, Sun Microsystems, Inc.

[Wayne]

Alan Coopersmith wrote:

> "cljlk" <cljlk@hotmail.com> writes in comp.unix.solaris:
> |How do I determine what the maximum of array I can use in C program?
> |I have Sun Solaris. How many array I can declare, I know it depends on
> |memory.
>
> You divide the maximum memory your program can allocate by the size
> of the array members.

Actually it depends if the array is a local variable (on the stack)
or a global variable (on the heap). You program has a fixed size
stack (than can be adjusted with some ELF/ld tweaks), but the heap
can grow to the max ram size allowed for a process on your system.

-Wayne