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Message: [QUOTE="mediratta, post: 2884632"] Hi, I want to allocate memory for a large matrix, whose size will be around 2.5 million x 17000. Three fourth of its rows will have all zeroes, but it is not known which will be those rows. If I try to allocate memory for this huge array, then I get a segmentation fault saying: Program received signal SIGSEGV, Segmentation fault. 0xb7dd5226 in mallopt () from /lib/tls/i686/cmov/libc.so.6 I have not given any compiler options. I think that the error is because I am allocating too big a size ? Can anyone please, suggest me how to store/manage such a matrix in C/C+ + ? Can mmap be useful ? I am using linux on i386 with gcc (GCC) 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5) thanks anupam [/QUOTE]