This is the mail archive of the
mailing list for the GNU Fortran project.
Re: gfortran47, pgf90 work - ifort segfaults
On Fri, Feb 10, 2012 at 11:43:15AM +0000, Anton Shterenlikht wrote:
> On Fri, Feb 10, 2012 at 11:40:55AM +0100, Tobias Burnus wrote:
> > On 02/10/2012 11:08 AM, Anton Shterenlikht wrote:
> > >Intel: 12.0.2 20110112
> > >The code below segfaults only when compiled with Intel compiler.
> > The code looks valid - and using ifort 11.1, 12.0.3 and 12.1.1, it does
> > not crash for me; thus, it could be fixed in later 12.0.x versions or
> > might have different reasons.
> > On issue which can lead to segfaults is a too small stack. And in
> > particular the Intel compiler uses a lot of stack space by default.
> > Stack memory is fast - faster than memory allocated on the heap. But the
> > down side is: By default the available stack size is rather limited.
> > Thus, one easily runs into stack issues. Having large arrays can require
> > a lot of stack size - exceeding the available space leads to segfaults.
> > If ifort places "space1" on the stack, you need 31.5 MB stack space.
> > That's not very much but might be still too much. Could you check what
> > "ulimit -s" (POSIX shell, bash) or "limit stack" (csh, tcsh) prints?
> Tobias, thanks, you are right:
> % ifort z.f90
> % limit stack
> stacksize 10240 kbytes
> % ./a.out
> Segmentation fault
> % limit stack 100000
> % ./a.out
> How is stack space related to the available RAM?
fortran@gnu is not an Intel Fortran support forum.