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Salvatore Filippone 11cf3b128d Fixed old usage of igebs2d. 18 years ago
base Fixed old usage of igebs2d. 18 years ago
baseprec Take out obsolete refs to mpi_wtime, use psb_wtime instead. 18 years ago
docs Updated PENV with min/max. 18 years ago
krylov Fixed PRECAPLY name. 18 years ago
test Fixed large threshold to use function psb_cd_choose_large to account 18 years ago
util Updated PENV with min/max. 18 years ago
Changelog Fixed interface to PSB_HALO. 18 years ago
LICENSE Added one blank to LICENSE only in order to test the new svn setup 18 years ago
Make.inc Second step of major reorg: tested compilation. 18 years ago
Make.inc.g95 Merged in the version with ALLOCATABLE components. We are now moving 18 years ago
Make.inc.gcc42 Second step of major reorg: tested compilation. 18 years ago
Make.inc.ifc9 Second step of major reorg: tested compilation. 18 years ago
Make.inc.rs6k Second step of major reorg: tested compilation. 18 years ago
Makefile Fixed large threshold to use function psb_cd_choose_large to account 18 years ago
README Aligned to new names for internal constants. 18 years ago

README

This directory contains  the PSBLAS library, version 2.1.0

 
Version 1.0 of the library was described in:
S. Filippone, M. Colajanni
PSBLAS: A library for parallel linear algebra computation on sparse matrices
ACM Trans. on Math. Software, 26(4), Dec. 2000, pp. 527-550.

PLATFORMS: 

The compilation process relies on the choice of an appropriate
Make.inc file; we have tested with AIX XLF, Intel ifc/Linux, Lahey
F95/Linux,  Nag f95/Linux, GNU Fortran/Linux. If you succeed in compiling with 
other compiler/operating systems please let us know. 


LINUX:

There finally exist a GNU Fortran 95 implementation: we are using the
development snapshots from GCC 3.5.0, later 4.1 and 4.2  since July
2004, and it appears  to work. The 4.2 version of GNU compilers is now
our reference platform; the official 4.2.0 release is due pretty
soon. It now includes  support for ALLOCATABLES. 


The Lahey version we got access to (6.0 and 6.1) seems to suffer from
spurious extra copies problem; this is most apparent in the matrix
build process.  

For the Intel compilers, we recommend moving to version 9; previous
versions of the library have been compiled with version 7 and 8 of
ifort. 

IBM SP.
The library has been tested on an IBM SP2, SP4 and SP5, with XLC and XLF
compilers, and a version of the BLACS based on MPI.
The  setting 
 F90=xlf90 -qsuffix=f=f90
in Make.inc.rs6k takes care of the f90 extension. 
WARNING: xlf 8.1 introduced a performance bug, whereas a Fortan 90
code calling a  Fortan 77 code would incur spurious array copies;
please make sure your system has the PTF xlf 8102 installed. 



UTILITIES
The TEST/Fileread directory contains some utilities to convert to/from
Harwell-Boeing and MatrixMarket file formats. 


DOCUMENTATION

See userguide.pdf 
Please consult the sample programs, especially TEST/pargen/ppde90.f90. 


OTHER SOFTWARE CREDITS 

We include our modified implementation of some of the Sparker (serial
sparse BLAS)  material,  e.g. Jagged diagonal, plus a number of
extensions of our own design. The original file spblas.f can be
downloaded from matisa.cc.rl.ac.uk; of course any bugs in our
implementation are our own to fix.  The main reference for the serial
sparse BLAS is: 
Duff, I., Marrone, M., Radicati, G., and Vittoli, C.
Level 3 basic linear algebra subprograms for sparse matrices: a user 
level interface
ACM Trans. Math. Softw., 23(3), 379-401, 1997.

In the multilevel preconditioners we use SMMP by Randolph E. Bank and
Craig C. Douglas  na.bank@na-net.ornl.gov and
na.cdouglas@na-net.ornl.gov;  we wrapped  it in a Fortran 95 interface
with dynamic memory allocation. 

To compile and run our software you will need 

1. A working version of MPI

2. The MPI version of the BLACS  from
   http://www.netlib.org/blacs/index.html

3. A version of the BLAS; if you don't have a specific version for
   your platform you may try ATLAS available from
   http://math-atlas.sourceforge.net/ 

4. We have had good results with  the METIS library, from 
   http://www-users.cs.umn.edu/~karypis/metis/metis/main.html 
   This is not necessary to compile our library, but the test program
   in test/Fileread assumes you have it installed.  

5. For our preconditioners we include interfaces to the following
   software  packages:
   --  SuperLU 3.0        http://crd.lbl.gov/~xiaoye/SuperLU/
   --  UMFPACK 4.4        http://www.cise.ufl.edu/research/sparse/umfpack/ 
   These are optional, you only need to install them if you actually
   want to use them. 


TODO:

The PSBLAS team. 


Contact: Salvatore Filippone     salvatore.filippone@uniroma2.it

Credits for version 2.0:
Salvatore  Filippone
Alfredo    Buttari

The MD2P4 multilevel parallel preconditioners contained in directory
src/prec were developed with the contribution of:  
Pasqua     D'Ambra
Daniela    di Serafino
They are still in an early experimental stage, use at your own risk!

Credits for version 1.0:
Salvatore  Filippone
Michele    Colajanni
Fabio      Cerioni
Stefano    Maiolatesi
Dario      Pascucci