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\section{Adjoint code generation using OpenAD} |
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\label{sec_ad_openad} |
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Authors: Jean Utke, Patrick Heimbach and Chris Hill |
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\subsection{Introduction} |
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The development of OpenAD was initiated as part of the |
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ACTS (Adjoint Compiler Technology \& Standards) project funded by the NSF Information Technology Research (ITR) program. |
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The main goals for OpenAD initially defined for the ACTS project are: |
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% |
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\begin{enumerate} |
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% |
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\item |
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develop a flexible, modular, open source tool that can ge`nerate adjoint codes of numerical simulation programs, |
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% |
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\item |
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establish a platform for easy implementation and testing of source transformation algorithms via a language-independent abstract intermediate representation, |
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% |
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\item |
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support for source code written in C and Fortan, |
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% |
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\item |
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generate efficient tangent linear and adjoint for the |
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MIT general circulation model. |
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% |
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\end{enumerate} |
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OpenAD's homepage is at \texttt{http://www-unix.mcs.anl.gov/OpenAD/}. |
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A development WIKI is at |
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\texttt{http://wiki.mcs.anl.gov/OpenAD/index.php/Main\_Page}. |
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From the WIKI's main page, click on \texttt{Handling GCM} for |
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various aspects pertaining to differentiating the MITgcm with OpenAD. |
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\subsection{Downloading and installing OpenAD} |
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The OpenAD webpage has a detailed description on how to download and |
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build OpenAD. From its homepage, please click on |
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\texttt{Download Test Binaries}. |
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You may either download pre-built binaries for quick trial, |
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or follow the detailed build process described at |
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\texttt{http://www-unix.mcs.anl.gov/OpenAD/access.html} |
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\subsection{Building MITgcm adjoint with OpenAD} |
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\textbf{17-January-2008} |
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OpenAD was successfully built on head node of |
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\texttt{itrda.acesgrid.org}, for following system: |
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\begin{verbatim} |
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> uname -a |
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Linux itrda 2.6.22.2-42.fc6 #1 SMP Wed Aug 15 12:34:26 EDT 2007 i686 i686 i386 GNU/Linux |
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> cat /proc/version |
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Linux version 2.6.22.2-42.fc6 (brewbuilder@hs20-bc2-4.build.redhat.com) |
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(gcc version 4.1.2 20070626 (Red Hat 4.1.2-13)) #1 SMP Wed Aug 15 12:34:26 EDT 2007 |
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> module load ifc/9.1.036 icc/9.1.042 |
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\end{verbatim} |
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Head of MITgcm branch (checkpoint59m with some modif.s) was used for building |
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adjoint code. |
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Following routing needed special care (revert to revision 1.1): |
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\\ |
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\texttt{MITgcm\_contrib/heimbach/OpenAD/OAD\_support/active\_module.f90 } |
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