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Segmentation fault

Hello there,
I've a question regarding segmentation fault.
When I run my C++ code on SUN Workshop 6 under UNIX Solaris 8, it compiles
correctly, but after execution it gives a segmentation fault!
The program includes declaration of a huge multidimensiona l array which has
a variable size for each iteration. The matrix takes its size after
execution and this size can be as high as (50,000 x 50,000).
Is the segmentation error related to the size of this matrix? If so is there
any limitations on the memory allocation in SUN Workshop 6 or Unix Solaris
8 (with 1GB RAM memory)?
Thanks.
Jul 19 '05 #1
3 14396
eenna wrote:
Hello there,
I've a question regarding segmentation fault.
When I run my C++ code on SUN Workshop 6 under UNIX Solaris 8, it compiles
correctly, but after execution it gives a segmentation fault!
The program includes declaration of a huge multidimensiona l array which has
a variable size for each iteration. The matrix takes its size after
execution and this size can be as high as (50,000 x 50,000).
Is the segmentation error related to the size of this matrix? If so is there
any limitations on the memory allocation in SUN Workshop 6 or Unix Solaris
8 (with 1GB RAM memory)?
Thanks.


Small code example please? Also note that this group is for standard C++
questions only. If your problem depends on the environment, it is not
topical here. But you can post the small, compilable code example, and
let's see if there is anything wrong with it.

Jul 19 '05 #2
eenna schrieb:

Hello there,
I've a question regarding segmentation fault.
When I run my C++ code on SUN Workshop 6 under UNIX Solaris 8, it compiles
correctly, but after execution it gives a segmentation fault!
The program includes declaration of a huge multidimensiona l array which has
a variable size for each iteration. The matrix takes its size after
execution and this size can be as high as (50,000 x 50,000).
It depends on the element size. 50,000 x 50,000 is 250 M, which is roughly 250
MBytes with chars or 1 GByte with 4-byte floats or ints. 1 such array my fit in
your virtual memory. If you have 8-byte floats (double) then you need approx. 2
Gbytes and that may exceed the architectural limits of a 32-Bit machine (don't
know whether your Sun is 64 bit)
hth
Klaus
Is the segmentation error related to the size of this matrix? If so is there
any limitations on the memory allocation in SUN Workshop 6 or Unix Solaris
8 (with 1GB RAM memory)?
Thanks.

Jul 19 '05 #3

"klaus hoffmann" <dr***********@ t-online.de> wrote in message
news:3F******** *******@t-online.de...
eenna schrieb:

Hello there,
I've a question regarding segmentation fault.
When I run my C++ code on SUN Workshop 6 under UNIX Solaris 8, it compiles correctly, but after execution it gives a segmentation fault!
The program includes declaration of a huge multidimensiona l array which has a variable size for each iteration. The matrix takes its size after
execution and this size can be as high as (50,000 x 50,000).
It depends on the element size. 50,000 x 50,000 is 250 M, which is

roughly 250 MBytes with chars or 1 GByte with 4-byte floats or ints. 1 such array my fit in your virtual memory. If you have 8-byte floats (double) then you need approx. 2 Gbytes and that may exceed the architectural limits of a 32-Bit machine (don't know whether your Sun is 64 bit)
hth
Klaus


Ahem....calcula tor, please. Let's see...50,000 * 50,000....looks like
2,500,000,000 to me. That's 2.5 billion (or just under 2.4Gb), not 250
million. And that's just the item count. It's just too big.

-Howard

Jul 19 '05 #4

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