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Asked: 2026-05-16T15:39:43+00:00

I am writing a C program. In the first lines, I have typedef float

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I am writing a C program. In the first lines, I have

typedef float m_elem[NMAX][NMAX][3];
m_elem asa_m;   
m_elem asa_mi[100];

then, some calculations. At the moment, and for each run and depending on the input, I change on the code the NMAX value, and then recompile it and run it. For NMAX values below 500, the program runs ok, but for higher NMAX values (which I need for some input files), all I get is segmentation fault.

What do you recommend me to do here? I read about learning valgrind, but in this case I wonder if just changing compilation options somehow for allowing the program to deal with bigger matrices would help

Thanks

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1 Answer

  1. Editorial Team

    You’re probably running out of stack space.

    At NMAX=500, the asa_mi variable will need 500 * 500 * 3 * 100 * 4 bytes, or about 300 MB. Most operating systems won’t allow a stack that large, so you might want to check into your system’s limits.

    Did you try allocating it from the heap, with malloc() instead?

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