226 lines
3.8 KiB
HTML
226 lines
3.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Run A Program</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="The Beowulf HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Verification"
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HREF="x195.html"></HEAD
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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VLINK="#840084"
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ALINK="#0000FF"
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>The Beowulf HOWTO</TH
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="AEN202"
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></A
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>7. Run A Program</H1
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><P
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>Once you can do all the tests shown above, you should be able to run
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a program. From here on in, the instructions are lam specific.</P
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><P
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>Go back to the head node, log in as wolf, and enter the following
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commands:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>cat > /nnt/wolf/lamhosts
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wolf01
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wolf02
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wolf03
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wolf04
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<control d></PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>Go to the lam examples directory, and compile "hello.c":</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>mpicc -o hello hello.c
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cp hello /mnt/wolf </PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>Then, as shown in the lam documentation, start up lam:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>[wolf@wolf00 wolf]$ lamboot -v lamhosts
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LAM 7.0/MPI 2 C++/ROMIO - Indiana University
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n0<2572> ssi:boot:base:linear: booting n0 (wolf00)
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n0<2572> ssi:boot:base:linear: booting n1 (wolf01)
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n0<2572> ssi:boot:base:linear: booting n2 (wolf02)
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n0<2572> ssi:boot:base:linear: booting n3 (wolf04)
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n0<2572> ssi:boot:base:linear: finished</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>So we are now finally ready to run an app. [Remember, I am using
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lam; your message passing interface may have different syntax].</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>[wolf@wolf00 wolf]$ mpirun n0-3 /mnt/wolf/hello
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Hello, world! I am 0 of 4
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Hello, world! I am 3 of 4
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Hello, world! I am 2 of 4
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Hello, world! I am 1 of 4
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[wolf@wolf00 wolf]$</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>Recall I mentioned the use of NFS above. I am telling the nodes to
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all use the nfs shared directory, which will bottleneck when using a
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larger number of boxes. You could easily copy the executable to each box,
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and in the mpirun command, specify node local directories: mpirun n0-3
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/home/wolf/hello. The prerequisite for this is to have all the files
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available locally. In fact I have done this, and it worked better than
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using the nfs shared executable. Of course this theory breaks down if my
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cluster application needs to modify a file shared across the
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cluster.</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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>Prev</A
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>Home</A
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> </TD
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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>Verification</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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> </TD
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> |