[blfs-book] r21186 - trunk/BOOK/general/genlib

[bdubbs--- via blfs-book]

Author: bdubbs
Date: Sun Feb 17 09:20:47 2019
New Revision: 21186

Log:
Build fftw three times for different numeerical precisions.

Modified:
   trunk/BOOK/general/genlib/fftw.xml

Modified: trunk/BOOK/general/genlib/fftw.xml
==============================================================================
--- trunk/BOOK/general/genlib/fftw.xml  Sun Feb 17 00:33:12 2019        (r21185)
+++ trunk/BOOK/general/genlib/fftw.xml  Sun Feb 17 09:20:47 2019        (r21186)
@@ -9,7 +9,7 @@
   <!ENTITY fftw-md5sum        "8aac833c943d8e90d51b697b27d4384d">
   <!ENTITY fftw-size          "3.9 MB">
   <!ENTITY fftw-buildsize     "57 MB (add 1 MB for tests)">
-  <!ENTITY fftw-time          "0.3 SBU (using parallelism=4; add 1.9 SBU for 
tests)">
+  <!ENTITY fftw-time          "1.6 SBU (using parallelism=4; add 1.9 SBU for 
tests)">
 ]>
 
 <sect1 id="fftw" xreflabel="fftw-&fftw-version;">
@@ -81,11 +81,19 @@
   <sect2 role="installation">
     <title>Installation of fftw</title>
 
+    <note><para>We build fftw three times for different libraries that
+    suport different numerical precisions.</para></note>
+
     <para>
+      The first build is for double precision arithmetic.
       Install <application>fftw</application> by running the following 
commands:
     </para>
 
-<screen><userinput>./configure --prefix=/usr  --enable-shared --enable-threads 
&amp;&amp;
+<screen><userinput>./configure --prefix=/usr    \
+            --enable-shared  \
+            --enable-threads \
+            --enable-sse2    \
+            --enable-avx     &amp;&amp;
 make</userinput></screen>
 
     <para>To test the results, issue: <command>make check</command>.
@@ -97,6 +105,41 @@
     </para>
 
 <screen role="root"><userinput>make install</userinput></screen>
+
+    <para>Now build single precision:</para>
+
+<screen><userinput>make clean &amp;&amp;
+
+./configure --prefix=/usr    \
+            --enable-shared  \
+            --enable-threads \
+            --enable-sse2    \
+            --enable-avx     \
+            --enable-float   &amp;&amp;
+make</userinput></screen>
+
+    <para>
+      As the <systemitem class="username">root</systemitem> user:
+    </para>
+
+<screen role="root"><userinput>make install</userinput></screen>
+
+    <para>Finally, build lomg double precision:</para>
+
+<screen><userinput>make clean &amp;&amp;
+
+./configure --prefix=/usr    \
+            --enable-shared  \
+            --enable-threads \
+            --enable-long-double &amp;&amp;
+make</userinput></screen>
+
+    <para>
+      As the <systemitem class="username">root</systemitem> user:
+    </para>
+
+<screen role="root"><userinput>make install</userinput></screen>
+
   </sect2>
 
   <sect2 role="commands">
-- 
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