Segmentation fault

[skyglin]

I ran into a segmentation fault when I declare big arrays such as

double array[128][10240];

this occupies only 10MB of memory (I have 320 MB of RAM). What is the problem? Thanks for help.

I can use malloc to allocate 10MB of space for this (using pointers), however I doubt it would be in a large block of continuous memory.

[skyglin]

I have used MS Visual C++ 6.0, GCC, and MPICC to compile. Only worked with small sized arrays.

[quzah]

Originally posted by skyglin
I have used MS Visual C++ 6.0, GCC, and MPICC to compile. Only worked with small sized arrays.

As Salem asked earlier: Is it a local or global array? Static or automatic? This will determine where it's trying to be allocated: heap or stack.

My bet is it's local/non-static. Make it a global variable, or a static array.

Quzah.

[skyglin]

sorry, it's local/non-static.

I have tried global and it worked. Is there any way to make it work as a local array?

How come global works but not local?

Thanks a lot!

[_Elixia_]

or malloc it. Malloc is guaranteed to return a chunk of contiguous memory of the size you request.

[quzah]

Originally posted by _Elixia_
or malloc it. Malloc is guaranteed to return a chunk of contiguous memory of the size you request.

Slight correction:

Malloc is guaranteed to return a chunk of contiguous memory of the size you request. Or, it will fail, returning NULL.

Quzah.

[skyglin]

Thank you for your guys' help. This site is really helpful!