Ok, thanks a lot for your help. Anna ----- Original Message ----- From: "John S. Fine" <johnsfine@xxxxxxxxxxx> Date: Thursday, April 15, 2010 6:30 pm Subject: Re: maximum array size? > Integers in x86_64 are 32 bit. So in your chain of multiplying > you need > to multiply by something of type std::size_t before the running > value > goes over two billion. > > As it is now, you get overflow in the integer multiply so the case > that > seems to work is actually reserving far less memory than you think > you > are requesting. > > Once you get rid of the integer overflow, you should see that the > amount > you can reserve is limited by swap size plus large part of ram, so > if > you really want something that big, you'll need a lot more swap space. > > Anna Sidera wrote: > > inp_par_a=10000 and inp_par_b=10000. For inp_par_c=60 the > program works. For inp_par_c=40 or inp_par_c=80 I get segmentation > fault.> > > I just calculated the memory the array needs and it is more than > the available 10GB ram + 3GB swap in the system even for inp_par_c=40. > > > > > > > > > > > >
