NAG Parallel Library, Release 3

FDL6A03DP

AMD64 Linux

Users' Note



Contents

1. Introduction

This document is essential reading for every user of the NAG Parallel Library implementation specified in the title. It provides implementation-specific detail that augments the information provided in the NAG Parallel Library Manual.

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

2. General Information

2.1. MPI

Parallel programs using the NAG Parallel Library require the MPICH implementation of MPI to be installed. MPI enables a group of workstations to behave as an independent distributed memory parallel computer. A crucial component of MPI is the mpirun command, which can be used to run parallel programs on multiple workstations.

2.2. Accessing the Library

Assuming that links to libnagmpi.a, libacml.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:

pgf77 driver.f -lnagmpi -lmpich -lnagfls -lacml
where driver.f is your application program.

2.3. Running NAG Parallel Library Programs

The mpirun command must be used to run a user program (say a.out) linked with the NAG Parallel Library on multiple nodes. For example
mpirun -np 4 a.out
instructs 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.

2.4. Example Programs

The example programs and data and the results obtained during the preparation of this specific implementation are supplied so you can try them yourself, or use one as a template for your own program. Note that the example material has been adapted, if necessary, from that printed in the NAG Parallel Library Manual, so that programs are suitable for execution with this implementation.

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 f04ebfp
to run the F04EBFP example program.

2.5. On-line User Documentation

The following machine-readable information files are provided in the doc directory:

See Section 4 for additional documentation.

3. Routine-specific Information

(a) X02

The constants referred to in the NAG Parallel Library Manual have the following values in this implementation:

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 floating-point arithmetic
                X02AJF = 1.11022302462516D-16
                X02AKF = 2.22507385850721D-308
                X02ALF = 1.79769313486231D+308
                X02AMF = 2.22507385850721D-308
                X02ANF = 2.22507385850721D-308
Parameters of other aspects of the computing environment
                X02AHF = 1.42724769270596D+45
                X02BBF = 2147483647
                X02BEF = 15
                X02DAF = .FALSE.

4. Documentation

On-line documentation is provided, in PDF form, with this implementation. Please refer to local information for access to this documentation.

5. Support from NAG

(a) Contact with NAG

Queries concerning this document or the implementation generally should be directed initially to your local Advisory Service. If you have difficulty in making contact locally, you can contact NAG directly at one of the addresses given in the Appendix.

(b) NAG Response Centres

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 FDL6A03DP).

(c) NAG Websites

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.co.uk/

or

http://www.nag.com/ (in North America)

or

http://www.nag-j.co.jp/ (in Japan)

(d) NAG Electronic Newsletter

If you would like to be kept up to date with news from NAG then please register to receive our free electronic newsletter, which will alert you to special offers, announcements about new products or product/service enhancements, customer stories and NAG's event diary. You can register via one of our websites, or by contacting us at nagnews@nag.co.uk.

6. User Feedback

Many factors influence the way NAG's products and services evolve and your ideas are invaluable in helping us to ensure that we meet your needs. If you would like to contribute to this process we would be delighted to receive your comments. Please contact your local NAG Response Centre (shown below).

Appendix - Contact Addresses

NAG Ltd
Wilkinson House
Jordan Hill Road
OXFORD  OX2 8DR                         NAG Ltd Response Centre
United Kingdom                          email: support@nag.co.uk

Tel: +44 (0)1865 511245                 Tel: +44 (0)1865 311744
Fax: +44 (0)1865 310139                 Fax: +44 (0)1865 310139 

NAG Inc
1431 Opus Place, Suite 220
Downers Grove
IL 60515-1362                           NAG Inc Response Center
USA                                     email: infodesk@nag.com

Tel: +1 630 971 2337                    Tel: +1 630 971 2345
Fax: +1 630 971 2706                    Fax: +1 630 971 2706

Nihon NAG KK
Hatchobori Frontier Building 2F
4-9-9
Hatchobori

Chuo-ku
Tokyo 104-0032
Japan
email: help@nag-j.co.jp

Tel: +81 (0)3 5542 6311
Fax: +81 (0)3 5542 6312