mirror of
https://github.com/Ponce/slackbuilds
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135 lines
6.5 KiB
Text
135 lines
6.5 KiB
Text
IMPORTANT NOTES
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1) The present SlackBuild for ATLAS does by no means try to take into account
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all configuration/build issues of ATLAS. Nevertheless, any relevant patches
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mentioned in the ATLAS Errata are applied.
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2) The script mostly assumes that you are installing on an x86 or x86_64
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platform and use gcc for compilation. If you decide to use other compilers or
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install on another platform, you are unfortunately on your own and welcome to
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suggest improvements or patches to this SlackBuild. There is one small
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exception to this: the USE_DWALL variable, see below.
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3) There is no "post install" tuning performed by this script.
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4) ATLAS does not conflict with the reference netlib BLAS. Nevertheless, if
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ATLAS got installed successfully you should consider removing netlib BLAS and
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(re)compiling every BLAS/LAPACK dependent package. Otherwise you may not have
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much gain from installing ATLAS.
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5) There is a strong interaction between ATLAS and LAPACK. By default ATLAS
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implements an optimized subset of LAPACK and creates the corresponding static
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library. Nevertheles, provided that the full LAPACK source is available,
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ATLAS builds a complete LAPACK library linked against its optimized BLAS
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implementation. This is what the atlas SlackBuild does by default. You may
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decide that you don't what this, then make use of the LAPACK_SOURCE variable
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(see below).
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INSTALLATION DETAILS
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1) Make sure CPU throttling is off before starting the install. This is
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important, since ATLAS has to tune itself. As with Slackware 14.2 you
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can run /etc/rc.d/rc.cpufreq as root with "performance" as command line
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argument. To reset, run it again with what gets set at boot time (by
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default "ondemand") as command line argument.
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2) For the same reason, keep the extra load on the system as low as possible
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while building ATLAS.
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GENERIC SETUP VARIABLES
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1) SYS_DESTDIR is set by default to "/usr" and is the system destination
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directory. When installing the package produced by this SlackBuild,
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ATLAS's and LAPACK's files will be written to $SYS_DESTDIR/include,
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$SYS_DESTDIR/include/atlas and $SYS_DESTDIR/lib (or lib64).
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Documentation files are written to /usr/doc/atlas-$VERSION if not
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otherwise stated (see below).
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You may want to change the value of SYS_DESTDIR to avoid conflicts. If
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you do so, you have to make sure that these libraries and corresponding
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headers are found by the compiler or the configuration software used
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to build code depending on them.
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IMPORTANT: SYS_DESTDIR has to have an absolute path as value.
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2) DEFAULT_DOCS has the default value "yes", which means that docs go
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to /usr/doc/atlas-$VERSION, but you may want to let the docs go
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to $SYS_DESTDIR/doc/atlas-$VERSION. For this, just set this
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variable to "no".
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SETUP VARIABLES FOR ATLAS
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1) USE_ARCH_DEFAULTS defaults to "yes", which means that the library
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will be optimized by trying to take into account former builds done
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on a similar machine. Thus ATLAS will use predefined optimizations
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if available. This may reduce (much) the compilation time but may
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not give you the best result if you don't use the same gcc compiler
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version as the ATLAS author.
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Please note that with this variable set to "no", or if there are no
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known optimizations for your machine ATLAS compilation may last for
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many hours! Take a nap :-)
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NOTE: On the machine of this SlackBuild's author setting
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USE_ARCH_DEFAULTS to "no" provided libraries with definitely
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better performance. Compilation took about six hours.
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2) ARCH_DEF_DIR has different meanings, depending on the value of
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USE_ARCH_DEFAULTS:
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a) If USE_ARCH_DEFAULTS is "yes" and you have some custom architectural
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defaults, then you may set this to the absolute path of the directory
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containing the file with your custom defaults.
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b) If USE_ARCH_DEFAULTS is "no" and you would like to create custom
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architectural defaults then set this to the absolute path of the
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directory which should contain the file with the custom defaults.
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NOTE: Since this file is supposed to survive an upgrade, it doesn't
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get included in the Slackware package. You have to remove it
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by hand, if needed. A file named "ARCH_DEF_DIR" gets written
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to the documentation directory, to remind you where the created
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architectural defaults are. Make a backup of it, since it may
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get deleted with an upgrade.
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ARCH_DEF_DIR defaults to the empty string, which means that neither your
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custom defaults are used nor custom defaults are created.
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3) USE_DWALL defaults to "no" which should be OK for x86 or x86_64 and the gcc
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compiler. If you are on another architecture than x86 and/or don't use gcc
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you need to set it to "yes".
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4) L2_CACHE_SIZE provides the size of the level 2 cache in bytes. By default it
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is deduced from /proc/cpuinfo but you can just set the value manually, if you
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wish or need so.
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5) NUM_THREADS allows you to set the maximum number of threads. By default it
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is "-1", which means autodection. In this case it gets set equal to the
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number of available processors.
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6) USE_PROCESSORS is by default the empty string, which means that any of the
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available processors may be used. Nevertheless, under some circumstances,
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one may want to specify the processor IDs, e.g. "0 2 4". Please consult
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atlas_install.pdf, p. 13 for more informations.
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NOTES: a) This is incompatible with the autodetection of the number of
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threads. Therefore NUM_THREADS must be greater than 1.
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b) Write just the processor IDs to this string, the script takes
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care of the rest. Take care to have NUM_THREADS equal to the
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amount of processor IDs.
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7) SHARED_SWITCH is set by default to ask for building shared libs along with
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the static ones. Set this to the empty string, if you don't want to have
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shared libs.
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SETUP VARIABLES FOR LAPACK
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1) LAPACK_SOURCE set this variable to the empty string, if you don't want for a
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full LAPACK library to get build.
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2) TEST_LAPACK set this variable to "yes" if you would like to run the LAPACK
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tests. You will find the results of the tests in the documentation directory.
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This has no relevance, if you didn't allow for a full LAPACK build.
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3) LAPACK_TIMER sets the timer to be used for LAPACK. If you stay with
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gfortran, presently the default compiler on Slackware, you can leave the
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value as is. Otherwise, set it to "NONE" or read LAPACK's make.inc.example
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for more informations.
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This has no relevance, if you didn't allow for a full LAPACK build.
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