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<html>
<head>
<title>BLAS FAQ</title>
</head>
<body>
<center>
<h1> BLAS Frequently Asked Questions (FAQ) </h1>
<h2>
<i>
<a href="mailto:lapack@cs.utk.edu"><address>lapack@cs.utk.edu</address></a>
</i>
</h2>
</center>
<p>
<IMG SRC="http://www.netlib.org/scalapack/html/gif/blue.gif"></p>
<p>
<i>
Many thanks to the <a href="http://www.netlib.org/utk/icl/maintainers.html">
netlib_maintainers@netlib.org</a> from whose FAQ list I have patterned
this list for the BLAS.
</i>
</p>
<p>
<IMG SRC="http://www.netlib.org/scalapack/html/gif/blue.gif"></p>
<h2>
Table of Contents
</h2>
<dl>
<a href="#1.1"> <dd>1.1) What are the BLAS?</a>
<a href="#1.2"> <dd>1.2) Publications/references for the BLAS?</a>
<a href="#1.3"> <dd>1.3) Is there a Quick Reference Guide to the BLAS available?</a>
<a href="#1.4"> <dd>1.4) Are optimized BLAS libraries available?</a>
<a href="#1.5"> <dd>1.5) Where can I find vendor supplied BLAS?</a>
<a href="#1.6"> <dd>1.6) Where can I find the Intel BLAS for Linux?</a>
<a href="#1.7"> <dd>1.7) Where can I find Java BLAS?</a>
<a href="#1.8"> <dd>1.8) Are prebuilt Fortran77 ref implementation BLAS libraries available from Netlib?</a>
</dl>
<p>
<IMG SRC="http://www.netlib.org/scalapack/html/gif/blue.gif"></p>
<h2>
1) BLAS
</h2>
<p>
<strong>
<a name="1.1">
1.1) What are the BLAS?<br>
</a>
</strong>
<p>
The BLAS (Basic Linear Algebra Subprograms) are high quality
"building block" routines for performing basic vector and matrix
operations. Level 1 BLAS do vector-vector operations, Level 2
BLAS do matrix-vector operations, and Level 3 BLAS do
matrix-matrix operations. Because the BLAS are efficient,
portable, and widely available, they're commonly used in the
development of high quality linear algebra software,
<a href="http://www.netlib.org/linpack/">LINPACK</a> and
<a href="http://www.netlib.org/lapack/">LAPACK</a> for example.
<p>
A Fortran77 reference implementation of the BLAS is located in the
<a href="http://www.netlib.org/blas/">blas directory</a> of Netlib.
<p>
<strong>
<a name="1.2">
1.2) Publications/references for the BLAS?<br>
</a>
</strong>
<p>
<ol>
<li>
C. L. Lawson, R. J. Hanson, D. Kincaid, and F. T. Krogh, <i>Basic
Linear Algebra Subprograms for FORTRAN usage</i>, ACM Trans. Math.
Soft., 5 (1979), pp. 308--323.<p>
<li>
J. J. Dongarra, J. Du Croz, S. Hammarling, and R. J. Hanson, <i>An
extended set of FORTRAN Basic Linear Algebra Subprograms</i>, ACM Trans.
Math. Soft., 14 (1988), pp. 1--17.<p>
<li>
J. J. Dongarra, J. Du Croz, S. Hammarling, and R. J. Hanson,
<i>Algorithm 656: An extended set of FORTRAN Basic Linear Algebra
Subprograms</i>, ACM Trans. Math. Soft., 14 (1988), pp. 18--32.<p>
<li>
J. J. Dongarra, J. Du Croz, I. S. Duff, and S. Hammarling, <i>A set of
Level 3 Basic Linear Algebra Subprograms</i>, ACM Trans. Math. Soft.,
16 (1990), pp. 1--17.<p>
<li>
J. J. Dongarra, J. Du Croz, I. S. Duff, and S. Hammarling, <i>Algorithm
679: A set of Level 3 Basic Linear Algebra Subprograms</i>, ACM Trans.
Math. Soft., 16 (1990), pp. 18--28.<p>
</ol>
<p>
<strong>
<a name="1.3">
1.3) Is there a Quick Reference Guide to the BLAS available?<br>
</a>
</strong>
<p>
Yes, there is a postscript version of the <a href="http://www.netlib.org/blas/blasqr.ps">Quick Reference Guide to the BLAS</a> available.
<p>
<strong>
<a name="1.4">
1.4) Are optimized BLAS libraries available?<br>
</a>
</strong>
<p>
YES! Machine-specific optimized BLAS libraries are available for
a variety of computer architectures. These optimized BLAS libraries
are provided by the computer vendor or by an independent software
vendor (ISV). For further details, please contact your local vendor
representative.</p>
<p>
Optimized BLAS libraries are <b>NOT</b> provided on netlib.</p>
<p>
However, if a machine-specific optimized <b>BLAS</b> library is not
available on the architecture to which you are installing <b>LAPACK</b>,
you can download a <a href="http://www.netlib.org/blas/blas.tgz">Fortran77
reference implementation of the BLAS</a> from netlib.</p>
<p>
<strong>
<a name="1.5">
1.5) Where can I find vendor supplied BLAS?<br>
</a>
</strong>
<p>
BLAS Vendor List <BR>
Last updated: November 13, 1998 <BR>
<HR><TABLE BORDER="1" CELLPADDING="3">
<TR><TD ALIGN=LEFT><BOLD><H3> Vendor </H3></TD>
<TD ALIGN=LEFT><BOLD><H3> URL </H3></BOLD></TD></TR>
<TR><TD ALIGN=LEFT> Cray </TD>
<TD ALIGN=LEFT>
<A HREF="http://www.sgi.com/Products/appsdirectory.dir/Applications/Math_Physics_Other_Sciences/ApplicationNumber587410.html">
http://www.sgi.com/Products/appsdirectory.dir/Applications/Math_Physics_Other_Sciences/
</A></TD></TR>
<TR><TD ALIGN=LEFT> DEC </TD>
<TD ALIGN=LEFT>
<A HREF="http://www.digital.com/info/hpc/software/dxml.html">
http://www.digital.com/info/hpc/software/dxml.html
</A></TD></TR>
<TR><TD ALIGN=LEFT> HP </TD>
<TD ALIGN=LEFT>
<A HREF="http://www.hp.com/esy/systems_networking/tech_servers/products/library.html">
http://www.hp.com/esy/systems_networking/tech_servers/products/library.html
</A></TD></TR>
<TR><TD ALIGN=LEFT> IBM </TD>
<TD ALIGN=LEFT>
<A HREF="http://www.rs6000.ibm.com/software/Apps/essl.html">
http://www.rs6000.ibm.com/software/Apps/essl.html
<BR>
<A HREF="http://www.rs6000.ibm.com/software/sp_products/esslpara.html">
http://www.rs6000.ibm.com/software/sp_products/esslpara.html
</A></TD></TR>
<TR><TD ALIGN=LEFT> Intel </TD>
<TD ALIGN=LEFT>
<A HREF="http://www.intel.com/vtune/perflibst/mkl/mklperf.htm">
http://www.intel.com/vtune/perflibst/mkl/mklperf.htm (NT)
</A></TD></TR>
<TR><TD ALIGN=LEFT> SGI </TD>
<TD ALIGN=LEFT>
<A HREF="http://www.sgi.com/software/scsl.html">
http://www.sgi.com/software/scsl.html
</A></TD></TR>
<TR><TD ALIGN=LEFT> SUN </TD>
<TD ALIGN=LEFT>
<A HREF="http://www.sun.com/workshop/fortran/
">
http://www.sun.com/workshop/fortran/
</A></TD></TR>
</TABLE>
</p>
<p>
<strong>
<a name="1.6">
1.6) Where can I find the Intel BLAS for Linux?<br>
</a>
</strong>
<p>
Yes, the Intel BLAS for Linux are now available! Refer to the following
URL:
<a href="http://www.cs.utk.edu/~ghenry/distrib/">Intel BLAS for Linux</a>.
</p>
<p>
<strong>
<a name="1.7">
1.7) Where can I find Java BLAS?<br>
</a>
</strong>
<p>
Yes, Java BLAS are available. Refer to the following
URLs:
<a href="http://www.cs.utk.edu/f2j/download.html">Java LAPACK</a>
and
<a href="http://math.nist.gov/javanumerics/">JavaNumerics</a>
The <b>JavaNumerics</b> webpage provides a focal point for information
on numerical computing in Java.
</p>
<p>
<strong>
<a name="1.8">
1.8) Are prebuilt Fortran77 ref implementation BLAS libraries available from Netlib?<br>
</a>
</strong>
<p>
Yes. HOWEVER, it is assumed that you have a machine-specific optimized <b>BLAS</b>
library already available on the architecture to which you are installing
<b>LAPACK</b>. If this is not the case, you can download a
<a href="http://www.netlib.org/blas/archives/">prebuilt Fortran77 reference
implementation BLAS library</a> or compile the
<a href="http://www.netlib.org/blas/blas.tgz">Fortran77 reference implementationsource code of the BLAS</a> from netlib.
<p>
Although a model implementation of the BLAS in available
from netlib in the <a href="http://www.netlib.org/blas/">blas directory</a>,
it is not expected to perform as well as a specially
tuned implementation on most high-performance computers -- on some machines
it may give much worse performance -- but it allows users to run LAPACK
software on machines that do not offer any other implementation of the
BLAS.
<p>
<IMG SRC="http://www.netlib.org/scalapack/html/gif/blue.gif"></p>
<a href="mailto:lapack@cs.utk.edu"><address>lapack@cs.utk.edu</address></a>
</body>
</html>
|
