How to use the PaStiX solver in Kratos
(→Compile the Scotch library) |
(→Compile the Scotch library) |
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It can be linked to the Kratos by the '''ExternalSolversApplication'''. The following steps have to be made in order to use be able to use it in Ubuntu version 14.04 LTS 64 bit or 16.04 LTS 64 bit. | It can be linked to the Kratos by the '''ExternalSolversApplication'''. The following steps have to be made in order to use be able to use it in Ubuntu version 14.04 LTS 64 bit or 16.04 LTS 64 bit. | ||
| − | == Compile the Scotch library == | + | == Compile the Scotch library (serial version)== |
PaStiX needs the Scotch library as a prerequisite to work. | PaStiX needs the Scotch library as a prerequisite to work. | ||
Revision as of 09:55, 3 January 2017
How to use the PaStiX solver in Kratos
The PaStiX (Parallel Sparse matriX package) is a open-source scientific library that provides a high performance parallel solver for very large sparse linear systems based on direct methods. Numerical algorithms are implemented in single or double precision (real or complex) using LLt, LDLt and LU with static pivoting (for non symmetric matrices having a symmetric pattern). This solver provides also an adaptive blockwise iLU(k) factorization that can be used as a parallel preconditioner using approximated supernodes to build a coarser block structure of the incomplete factors ([1]).
It can be linked to the Kratos by the ExternalSolversApplication. The following steps have to be made in order to use be able to use it in Ubuntu version 14.04 LTS 64 bit or 16.04 LTS 64 bit.
Compile the Scotch library (serial version)
PaStiX needs the Scotch library as a prerequisite to work.
You can download version 6.0.4 here:
http://gforge.inria.fr/projects/scotch/
Copy it to a folder of your choice. In the following we are using "~/compiled_libraries" as a reference.
Extract the files by the command:
tar -xf scotch_6.0.4.tar.gz
Navigate into the source directory by:
cd scotch_6.0.4/src
Copy the correct MakeFile.inc for the version of your system to the source directory. Ín the case of the Ubuntu versions mentioned above it is the Makefile.inc.x86-64_linux2:
cp ./Make.inc/Makefile.inc.x86-64_linux2 Makefile.inc
Additional libraries are necessary, which can be installed by:
sudo apt-get install flex bison zlib1g-dev
In order to install Scotch locally the install path has to be set. Since the "prefix" command is not working this has to be done manually in the Makefile, which is also located in the /src folder. You can see an example for the part of the file to be modified below:
...some code...
include Makefile.inc
prefix ?= ~/software/scotch_6.0.4-install
bindir ?= $(prefix)/bin
includedir ?= $(prefix)/include
libdir ?= $(prefix)/lib
datarootdir ?= $(prefix)/share
mandir ?= $(datarootdir)/man
...some code...
Now Scotch can be compiled by (we are still in the /src directory):
make scotch
And can be installed to the directory specified in the MakeFile by:
make install
