NAG recommends that users read the following minimum reference material before calling any library routine:
(a) Essential Introduction
(b) Chapter Introduction
(c) Routine Document
(d) Implementation-specific Users' Note
Items (a), (b) and (c) are included in the NAG Parallel Library Manual, which should be available locally in printed and PDF form (see Section 4); item (d) is this document, which is provided in HTML form.
Assuming that links to libnagmpi.a, libnagmpiblas.a and libnagfls.a have been placed in a directory in the search path of the linker, then you may link to the NAG Parallel Library as follows:
g77 driver.f -lnagmpi -lmpi -lnagmpiblas -lnagflswhere driver.f is your application program.
mpirun -np 4 a.outinstructs the system to execute the executable program a.out in four parallel processes. Consult local documentation for full details of the facilities of mpirun or alternatives to it.
The use of the NAG Parallel Library is controlled by the FLEXlm license management system (FLEXlm is a registered trademark of Globetrotter Software Inc). This release of the NAG Fortran Library uses version 7.0e of FLEXlm. HTML versions of the FLEXlm End User Manual and FAQ are provided with the Library, and will be installed on the local system.
Any application linked with the Library will not run unless it can access a valid license file. The default location of the license file is /usr/local/flexlm/licenses/license.dat. Alternatively, the environment variable LM_LICENSE_FILE may be set to the full path of the license file.
If an application is using a license that expires in the near future, warnings to that effect will be issued. These warnings may be suppressed by setting the environment variable NAG_LM_OPTS to include the characters "nowarn". If all the licenses to use the Library are in use, the application will not run. Setting NAG_LM_OPTS to include the characters "que" will cause the application to enter a queue until another application gives up its license, by undefining its Library Grid. For example, both the default licensing behaviours may be reversed by setting NAG_LM_OPTS to "nowarn,que".
The example programs are most easily accessed by using the script nagmpiexample, which will copy an example program and its data, compile it, link it with the libraries and run it.
For example, give the command
nagmpiexample f04ebfpto run the F04EBFP example program.
See Section 4 for additional documentation.
The values of the machine constants are:
The basic parameters of the model
X02BHF = 2 X02BJF = 53 X02BKF = -1021 X02BLF = 1024 X02DJF = .TRUE.Derived parameters of the floating-point arithmetic
X02AJF = 1.11130722679765D-16 X02AKF = 2.22507385850721D-308 X02ALF = 1.79769313486231D+308 X02AMF = 2.22507385850721D-308 X02ANF = 2.22507385850721D-308Parameters of other aspects of the computing environment
X02AHF = 1.84467440737095D+19 X02BBF = 2147483647 X02BEF = 15 X02DAF = .FALSE.
On-line documentation is also provided, in PDF form, with this implementation. Please refer to local information for access to this documentation.
The NAG Response Centres are available for general enquiries from all users and also for technical queries from sites with an annually licensed product or support service.
The Response Centres are open during office hours, but contact is possible by fax, email and phone (answering machine) at all times.
When contacting a Response Centre please quote your NAG site reference and NAG product code (in this case FDLUX03DM).
The NAG websites are an information service providing items of interest to users and prospective users of NAG products and services. The information is reviewed and updated regularly and includes implementation availability, descriptions of products, downloadable software, product documentation and technical reports. The NAG websites can be accessed at
http://www.nag.com/ (in North America)
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