Lengthy arrays and SIGSEGV - FIXED!

Blake Huff stangmechanic at gmail.com
Sat Dec 17 23:03:12 CET 2005


Moving the declaration out of the main() loop solves the problem as  
shown below:

#include <stdio.h>
#include <gmp.h>

#define ARRAY_SIZE 10000000

mpz_t test[ARRAY_SIZE];

int main (int argc, const char * argv[]) {

	mpz_array_init(test[0], ARRAY_SIZE, 128);

	return 0;

Thanks to everyone who responded!


n Dec 17, 2005, at 8:34 AM, Jim White wrote:

>> However, the following code  with an
>> ARRAY_SIZE of 700000 fails, but works with 600000.
>> Changing the number of bits being allocated doesn't
>> seem to change the outcome.
> Have you tried looping yourself to init the array
> elements?
> Perhaps this isn't a GMP problem at all, rather the
> way your compiler/platform handles fixed-size arrays.
> The mpz_t structure itself is 4 words, or 16 bytes in
> 32-bit mode, so you are asking for an array of 10mb or
> so.
> On some systems a compiler might have a limit on the
> size of a fixed array so it can use more efficient
> short-reach addressing instructions.
> If this does apply, there may be a compiler option
> that lets you get around it (e.g. on Intel-compatible
> PC's there's a "memory model" option on most
> compilers).
> Alternatively you may need to allocate the array at
> runtime.
> Jim White
> _______________________________________________
> gmp-discuss mailing list
> gmp-discuss at swox.com
> https://gmplib.org/mailman/listinfo/gmp-discuss

Blake Huff
stangmechanic at gmail.com

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