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<HTML><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><!-- Created on October, 14  2005 by texi2html 1.64 --><!-- Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)            Karl Berry  <karl@freefriends.org>            Olaf Bachmann <obachman@mathematik.uni-kl.de>            and many others.Maintained by: Olaf Bachmann <obachman@mathematik.uni-kl.de>Send bugs and suggestions to <texi2html@mathematik.uni-kl.de> --><HEAD><TITLE>Blitz++: Parallel Computing</TITLE><META NAME="description" CONTENT="Blitz++: Parallel Computing"><META NAME="keywords" CONTENT="Blitz++: Parallel Computing"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META NAME="Generator" CONTENT="texi2html 1.64"></HEAD><BODY LANG="" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000"><A NAME="SEC140"></A><TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0><TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC139"> &lt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC141"> &gt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_9.html#SEC142"> &lt;&lt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top"> Up </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_9.html#SEC142"> &gt;&gt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD></TR></TABLE><H1> 8. Parallel Computing with Blitz++ </H1><!--docid::SEC140::--><P>While Blitz++ can be used for parallel computing, it was not designedprimarily for this purpose.  For this reason, you may want to investigatesome other available libraries, such as POOMA, before choosing to implementa parallel code using Blitz++.</P><P><HR SIZE="6"><A NAME="SEC141"></A><TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0><TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC140"> &lt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_9.html#SEC142"> &gt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC140"> &lt;&lt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC140"> Up </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_9.html#SEC142"> &gt;&gt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD></TR></TABLE><H2> 8.1 Blitz++ and thread safety </H2><!--docid::SEC141::--><P><A NAME="IDX334"></A></P><P>To enable thread-safety in Blitz++, you need to do one of these things:</P><P><A NAME="IDX335"></A><A NAME="IDX336"></A></P><P><UL><A NAME="IDX337"></A><LI>Compile with <CODE>gcc -pthread</CODE>, or <CODE>CC -mt</CODE> under Solaris.(These options define <CODE>_REENTRANT</CODE>, which tells Blitz++ to generatethread-safe code).<P><LI>Compile with <CODE>-DBZ_THREADSAFE</CODE>, or <CODE>#define BZ_THREADSAFE</CODE>before including any Blitz++ headers.<P></UL><P>In threadsafe mode, Blitz++ array reference counts are safeguarded by amutex.  By default, pthread mutexes are used.  If you would prefer adifferent mutex implementation, add the appropriate <CODE>BZ_MUTEX</CODE> macrosto <CODE>&#60;blitz/blitz.h&#62;</CODE> and send them to <CODE>blitz-dev@oonumerics.org</CODE>for incorporation.</P><P><A NAME="IDX338"></A></P><P>Blitz++ does not do locking for every array element access; this wouldresult in terrible performance.  It is the job of the library user to ensurethat appropriate synchronization is used.</P><P><A NAME="Random Number Generators"></A><HR SIZE="6"><TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0><TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC140"> &lt;&lt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_9.html#SEC142"> &gt;&gt; </A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD></TR></TABLE><BR>  <FONT SIZE="-1">This document was generatedby <I>Julian Cummings</I> on <I>October, 14  2005</I>using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html"><I>texi2html</I></A></BODY></HTML>

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