Hi! I'm assuming you're working in userspace, since the memory allocation function in the kernel is kmalloc. On Sat, 2007-09-29 at 16:49 -0700, Irfan Ahmed wrote: > I need four dimensional array like > double a[256][256][256][256]; > > > but the size is too big to use an array. That's 32 GB memory! Are you *really* sure you want to do this? It would require a 64 bit system and "some" ram/swap space if you access the array. You have to do this on the *heap* not on the stack and have to be careful not to produce an integer overflow. > If I use only pointer like > double ****a; > > to allocate this memory, I have to run 3 loops to allocate > memory ..which takes lots of time. Because of 256^3 = ~17 million system calls... > I was thinking to use *a[256][256][256] > Can I use this ...and if yes how I can allocate the memory for > this...? You can do this, but it would be a 3 dimensional array of pointers, which is probably not what you want. Why not just allocate a memory and "cast" the pointer to an array? -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
