#language en

= NAG-library =

== License Key ==

The license keys expire after one year. NAG sends a new key, unrequested, to Stefan Braun and Thomas Loimer.
Usually, the new key is valid for the newest version.
To install the new key, append the lines between ! NAG key begin and ! NAG key end
to the file /usr/local/NAG/nag.key. Avoid blank lines!

The e-mail contains an ID number for the machine on which the license is valid.
The ID-number can be obtained by running, as root,[[BR]]
`  /usr/local/share/NAG/cll6i26dcl/license/bin/linux_x64/khostid`.[[BR]]
The license status, here for the product cll6i26dcl, can be queried by calling[[BR]]
`  /usr/local/share/NAG/cll6i26dcl/license/bin/linux_x64/klcheck cll6i26dcl`.


== Installation ==

Unpack the tar-file, e.g., into /usr/local/src/NAG, and run the install-script therein,
{{{
/usr/local/src/NAGnll6i271bl/install.sh -installdir=/usr/local/share/NAG
}}}

After installation, try to compile an example, from some temporary directory, and not as root,
{{{
/usr/local/share/NAG/nll6i30dbl/scripts/nag_example -gnu a00aac	# library identification, implementation details
/usr/local/share/NAG/nll6i30dbl/scripts/nag_example -gnu a00acc	# availability of license key
}}}
Enviroment variables to ease linking with the library can be set by sourcing nagvars.sh,[[BR]]
`  . /usr/local/share/NAG/nll6i271bl/scripts/nagvars.sh`

Documentation is downloaded to /usr/local/src/NAG/mk27-1_doc.tgz.
Users should also set the environment variable OMP_NUM_THREADS to sensible values, e.g.,[[BR]]
`  export OMP_NUM_THREADS=6`[[BR]]
depending also on the value contained in `OMP_NESTED`.