Did NAG fortran complier support it?

Simulate gmail.com> wrote:

1. I don't off-hand see it on their web site - not that I pent a lon
time looking.

but

2. For a current supported commercial product, I'd think it more natural
(and reliable) to ask the vendor directly instead of asking here. THey
are pretty easy to find... try nag.com.

3. Why do you say "did"? While the Nag compiler has seemed awfully slow
to come out with new releases in recent years, to my knowledge it is
still a current supported product.

On Sep 8, 5:17 pm, nos...@see.signature (Richard Maine) wrote:

I think it isn't. At least my 5.1 compiler for x86-64-Linux does not
support it.

And to add: I also don't think they disabled OpenMP in any new
version, which would be the other way of understanding the "did".

* * *

If you are looking for an OpenMP compiler, you have lots of choices:

GCC's gfortran supports OpenMP v2.5 since 4.2 and OpenMP v3.0 in the
developer releases 4.4.0. (gfortran is an open source compiler,
http://gcc.gnu.org/wiki/GFortran)

On Mon, 8 Sep 2008 09:48:06 -0700 (PDT), Tobias Burnus posted:

On 9 Sep., 05:43, Ron Ford wrote:

You need to compile with the option -fopenmp (cf. gfortran & gcc
documentation/man page):

On Mon, 8 Sep 2008 23:09:01 -0700 (PDT), Tobias Burnus posted:

F:\gfortran\source>gfortran -o thread -fopenmp ff55.f90

F:\gfortran\source>thread
Hello World from thread 0
There are 1 threads

F:\gfortran\source>

Thanks, tobias. Any ideas why you seem to have 2 threads and I only one?

On Sep 9, 8:59 pm, Ron Ford wrote:

Well, I have a computer with one CPU and two cores, you probably one
CPU with one core. By default number of threads = number of cores (=
number of cores per CPU * number of CPUs), which makes sense as this
gives the highest performance (assuming no other processes are
competing for CPU power and that the number of used cores is small
compared to the cost of forking all the new threads and having
"remote" memory accesses [the latter depends a bit on the design of
the CPU, but CPU-cache problems are always present]).

Try again after you have set the environment variable OMP_NUM_THREADS
to "2" or to "30" or to ...
Cf. http://gcc.gnu.org/onlinedocs/libgomp/ or the OpenMP specifiction*
or a good book/webpage about OpenMP

* = http://openmp.org/wp/ (for the spec, see top left corner)

Tobias

On Tue, 9 Sep 2008 12:31:25 -0700 (PDT), Tobias Burnus posted: