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<span id="label-deprecated-functions"></span><h1><span class="section-number">9.6. </span>Deprecation warnings while compiling MPI applications<a class="headerlink" href="#deprecation-warnings-while-compiling-mpi-applications" title="Permalink to this heading"></a></h1>
<p>If you see deprecation warnings when compiling MPI applications, it is
because your application is symbols / functions that are deprecated in
MPI. For example:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>mpicc<span class="w"> </span>deprecated-example.c<span class="w"> </span>-c
deprecated-example.c:<span class="w"> </span>In<span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="s1">'foo'</span>:
deprecated-example.c:6:5:<span class="w"> </span>warning:<span class="w"> </span><span class="s1">'MPI_Attr_delete'</span><span class="w"> </span>is<span class="w"> </span>deprecated:<span class="w"> </span>MPI_Attr_delete<span class="w"> </span>was<span class="w"> </span>deprecated<span class="w"> </span><span class="k">in</span><span class="w"> </span>MPI-2.0<span class="p">;</span><span class="w"> </span>use<span class="w"> </span>MPI_Comm_delete_attr<span class="w"> </span>instead<span class="w"> </span><span class="o">[</span>-Wdeprecated-declarations<span class="o">]</span>
<span class="w"> </span>MPI_Attr_delete<span class="o">(</span>MPI_COMM_WORLD,<span class="w"> </span><span class="m">2</span><span class="o">)</span><span class="p">;</span>
<span class="w"> </span>^~~~~~~~~~~~~~~
In<span class="w"> </span>file<span class="w"> </span>included<span class="w"> </span>from<span class="w"> </span>deprecated-example.c:2:
/usr/local/openmpi/include/mpi.h:2601:20:<span class="w"> </span>note:<span class="w"> </span>declared<span class="w"> </span>here
<span class="w"> </span>OMPI_DECLSPEC<span class="w"> </span>int<span class="w"> </span>MPI_Attr_delete<span class="o">(</span>MPI_Comm<span class="w"> </span>comm,<span class="w"> </span>int<span class="w"> </span>keyval<span class="o">)</span>
<span class="w"> </span>^~~~~~~~~~~~~~~
</pre></div>
</div>
<p>Note that the deprecation compiler warnings tells you how to upgrade
your code to avoid the deprecation warnings. In this example, it
advises you to use <code class="docutils literal notranslate"><span class="pre">MPI_Comm_delete_attr()</span></code> instead of
<code class="docutils literal notranslate"><span class="pre">MPI_Attr_delete()</span></code>.</p>
<p>Also, note that even if Open MPI was configured with
<code class="docutils literal notranslate"><span class="pre">--enable-mpi1-compatibility</span></code> to re-enable removed MPI-1 symbols,
you will still get compiler warnings when you use the removed symbols.</p>
<p>The following is a list of functions that have been deprecated in MPI,
and the function that is replacing them. Some functions have been
deprecated and removed from the MPI specification, these functions are
listed <a class="reference internal" href="removed-mpi-constructs.html#label-removed-mpi-constructs"><span class="std std-ref">here</span></a>.</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 33%" />
<col style="width: 33%" />
<col style="width: 33%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Deprecated symbol</p>
<p>(click for more details, below)</p>
</th>
<th class="head"><p>Replaced with</p>
<p>(click to go to the corresponding man page)</p>
</th>
<th class="head"><p>MPI version deprecating the symbol</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><a class="reference internal" href="#label-mpi-keyval-create"><span class="std std-ref">MPI_KEYVAL_CREATE</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_create_keyval.3.html#mpi-comm-create-keyval"><span class="std std-ref">MPI_COMM_CREATE_KEYVAL</span></a></p></td>
<td><p>MPI-2.0 (1996)</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#label-mpi-keyval-free"><span class="std std-ref">MPI_KEYVAL_FREE</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_free_keyval.3.html#mpi-comm-free-keyval"><span class="std std-ref">MPI_COMM_FREE_KEYVAL</span></a></p></td>
<td><p>MPI-2.0 (1996)</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#label-mpi-copy-delete-function"><span class="std std-ref">MPI_COPY_FUNCTION</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_create_keyval.3.html#mpi-comm-create-keyval"><span class="std std-ref">MPI_COMM_COPY_ATTR_FUNCTION</span></a></p></td>
<td><p>MPI-2.0 (1996)</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#label-mpi-copy-delete-function"><span class="std std-ref">MPI_DELETE_FUNCTION</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_create_keyval.3.html#mpi-comm-create-keyval"><span class="std std-ref">MPI_COMM_DELETE_ATTR_FUNCTION</span></a></p></td>
<td><p>MPI-2.0 (1996)</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#label-mpi-attr-put"><span class="std std-ref">MPI_ATTR_PUT</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_set_attr.3.html#mpi-comm-set-attr"><span class="std std-ref">MPI_COMM_SET_ATTR</span></a></p></td>
<td><p>MPI-2.0 (1996)</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#label-mpi-attr-get"><span class="std std-ref">MPI_ATTR_GET</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_get_attr.3.html#mpi-comm-get-attr"><span class="std std-ref">MPI_COMM_GET_ATTR</span></a></p></td>
<td><p>MPI-2.0 (1996)</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#label-mpi-attr-delete"><span class="std std-ref">MPI_ATTR_DELETE</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_delete_attr.3.html#mpi-comm-delete-attr"><span class="std std-ref">MPI_COMM_DELETE_ATTR</span></a></p></td>
<td><p>MPI-2.0 (1996)</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#label-errhandler-fn"><span class="std std-ref">MPI_Comm_errhandler_fn</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Comm_create_errhandler.3.html#mpi-comm-create-errhandler"><span class="std std-ref">MPI_Comm_errhandler_function</span></a></p></td>
<td><p>MPI-2.2 (2009)</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#label-errhandler-fn"><span class="std std-ref">MPI_File_errhandler_fn</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_File_create_errhandler.3.html#mpi-file-create-errhandler"><span class="std std-ref">MPI_File_errhandler_function</span></a></p></td>
<td><p>MPI-2.2 (2009)</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#label-errhandler-fn"><span class="std std-ref">MPI_Win_errhandler_fn</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Win_create_errhandler.3.html#mpi-win-create-errhandler"><span class="std std-ref">MPI_Win_errhandler_function</span></a></p></td>
<td><p>MPI-2.2 (2009)</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#label-mpi-info-get"><span class="std std-ref">MPI_INFO_GET</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Info_get_string.3.html#mpi-info-get-string"><span class="std std-ref">MPI_INFO_GET_STRING</span></a></p></td>
<td><p>MPI-4.0 (2021)</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#label-mpi-info-get-valuelen"><span class="std std-ref">MPI_INFO_GET_VALUELEN</span></a></p></td>
<td><p><a class="reference internal" href="../man-openmpi/man3/MPI_Info_get_string.3.html#mpi-info-get-string"><span class="std std-ref">MPI_INFO_GET_STRING</span></a></p></td>
<td><p>MPI-4.0 (2021)</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#label-mpi-sizeof"><span class="std std-ref">MPI_SIZEOF</span></a></p></td>
<td><p>Fortran intrinsics``c_sizeof`` or <code class="docutils literal notranslate"><span class="pre">storage_size</span></code></p></td>
<td><p>MPI-4.0 (2021)</p></td>
</tr>
</tbody>
</table>
<div class="section" id="mpi-keyval-create">
<span id="label-mpi-keyval-create"></span><h2><span class="section-number">9.6.1. </span>MPI_Keyval_create<a class="headerlink" href="#mpi-keyval-create" title="Permalink to this heading"></a></h2>
<p><code class="docutils literal notranslate"><span class="pre">MPI_Keyval_create</span></code> has been deprecated and replaced by
<code class="docutils literal notranslate"><span class="pre">MPI_Comm_create_keyval</span></code>. The C binding of the new function is
identical to the deprecated version. Hence, applications can simply
replace the function that is being invoked.</p>
<p>The Fortran binding differs in that the <code class="docutils literal notranslate"><span class="pre">extra_state</span></code> argument is an
address-sized integer in the new interfaces (vs. a regular integer in
the old interfaces). Also, the copy and delete callback functions have
Fortran bindings that are consistent with address-sized attributes.</p>
<div class="highlight-Fortran notranslate"><div class="highlight"><pre><span></span><span class="k">USE </span><span class="n">mpi</span>
<span class="k">EXTERNAL </span><span class="n">my_copy_attr_function</span>
<span class="k">EXTERNAL </span><span class="n">my_copy_delete_function</span>
<span class="kt">INTEGER </span><span class="n">ierror</span>
<span class="kt">INTEGER </span><span class="n">comm_keyval</span>
<span class="kt">INTEGER </span><span class="n">old_extra_state</span>
<span class="kt">INTEGER</span><span class="p">(</span><span class="nb">KIND</span><span class="o">=</span><span class="n">MPI_ADDRESS_KIND</span><span class="p">)</span><span class="w"> </span><span class="n">new_extra_state</span>
<span class="c">! Old way</span>
<span class="k">CALL </span><span class="n">MPI_KEYVAL_CREATE</span><span class="p">(</span><span class="n">my_copy_attr_function</span><span class="p">,</span><span class="w"> </span><span class="n">my_copy_delete_function</span><span class="p">,</span>
<span class="w"> </span><span class="n">comm_keyval</span><span class="p">,</span><span class="w"> </span><span class="n">old_extra_state</span><span class="p">,</span><span class="w"> </span><span class="n">ierror</span><span class="p">)</span>
<span class="c">! New way</span>
<span class="k">CALL </span><span class="n">MPI_COMM_CREATE_KEYVAL</span><span class="p">(</span><span class="n">my_copy_attr_function</span><span class="p">,</span><span class="w"> </span><span class="n">my_delete_attr_function</span><span class="p">,</span>
<span class="w"> </span><span class="n">comm_keyval</span><span class="p">,</span><span class="w"> </span><span class="n">new_extra_state</span><span class="p">,</span><span class="w"> </span><span class="n">ierror</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="mpi-keyval-free">
<span id="label-mpi-keyval-free"></span><h2><span class="section-number">9.6.2. </span>MPI_Keyval_free<a class="headerlink" href="#mpi-keyval-free" title="Permalink to this heading"></a></h2>
<p>The binding of <code class="docutils literal notranslate"><span class="pre">MPI_Keyval_free</span></code> and <code class="docutils literal notranslate"><span class="pre">MPI_Comm_free_keyval</span></code> are identical
for both C and Fortran. Users can directly replace the deprecated function with its
new version.</p>
</div>
<div class="section" id="mpi-copy-function-and-mpi-delete-function">
<span id="label-mpi-copy-delete-function"></span><h2><span class="section-number">9.6.3. </span>MPI_Copy_function and MPI_Delete_function<a class="headerlink" href="#mpi-copy-function-and-mpi-delete-function" title="Permalink to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">MPI_Copy_function</span></code> and <code class="docutils literal notranslate"><span class="pre">MPI_Delete_function</span></code> are only used in the
deprecated function <code class="docutils literal notranslate"><span class="pre">MPI_Keyval_create()</span></code>, as described in the
<a class="reference internal" href="#label-mpi-keyval-create"><span class="std std-ref">MPI_COMM_CREATE_KEYVAL</span></a>.</p>
<p>For C codes, developers can simply use the new, exactly-equivalent
type name (i.e., the return type, number, and type of parameters
didn’t change) <code class="docutils literal notranslate"><span class="pre">MPI_Comm_copy_attr_function</span></code>, and
<code class="docutils literal notranslate"><span class="pre">MPI_Comm_delete_attr_function</span></code> respectively.</p>
<p>For Fortran applications, the only difference lies in required integer type for the
<code class="docutils literal notranslate"><span class="pre">extra_state</span></code> argument, which now has to be an address-sized integer.</p>
</div>
<div class="section" id="mpi-attr-put">
<span id="label-mpi-attr-put"></span><h2><span class="section-number">9.6.4. </span>MPI_Attr_put<a class="headerlink" href="#mpi-attr-put" title="Permalink to this heading"></a></h2>
<p>The C binding for the deprecated <code class="docutils literal notranslate"><span class="pre">MPI_Attr_put</span></code> is identical to its
replacement, <code class="docutils literal notranslate"><span class="pre">MPI_Comm_set_attr</span></code>. The Fortran binding differ in the
usage of an addressed size integer for the attribute value in the new
<code class="docutils literal notranslate"><span class="pre">MPI_Comm_set_attr</span></code> vs. a regular integer in <code class="docutils literal notranslate"><span class="pre">MPI_Attr_put</span></code>.</p>
<div class="highlight-Fortran notranslate"><div class="highlight"><pre><span></span><span class="k">USE </span><span class="n">mpi</span>
<span class="kt">INTEGER </span><span class="n">ierror</span>
<span class="kt">INTEGER </span><span class="n">comm_keyval</span>
<span class="kt">INTEGER </span><span class="n">old_attr_val</span>
<span class="kt">INTEGER</span><span class="p">(</span><span class="nb">KIND</span><span class="o">=</span><span class="n">MPI_ADDRESS_KIND</span><span class="p">)</span><span class="w"> </span><span class="n">new_attr_val</span>
<span class="c">! Old way</span>
<span class="k">CALL </span><span class="n">MPI_ATTR_PUT</span><span class="p">(</span><span class="n">MPI_COMM_WORLD</span><span class="p">,</span><span class="w"> </span><span class="n">comm_keyval</span><span class="p">,</span>
<span class="w"> </span><span class="n">old_attr_val</span><span class="p">,</span><span class="w"> </span><span class="n">ierror</span><span class="p">)</span>
<span class="c">! New way</span>
<span class="k">CALL </span><span class="n">MPI_COMM_SET_ATTR</span><span class="p">(</span><span class="n">MPI_COMM_WORLD</span><span class="p">,</span><span class="w"> </span><span class="n">comm_keyval</span><span class="p">,</span>
<span class="w"> </span><span class="n">new_attr_val</span><span class="p">,</span><span class="w"> </span><span class="n">ierror</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="mpi-attr-get">
<span id="label-mpi-attr-get"></span><h2><span class="section-number">9.6.5. </span>MPI_Attr_get<a class="headerlink" href="#mpi-attr-get" title="Permalink to this heading"></a></h2>
<p>The C bindings of the old and the new interfaces are identical.
Fortran binding differ in the usage of an addressed size integer for
the attribute value in the new <code class="docutils literal notranslate"><span class="pre">MPI_Comm_get_attr</span></code> vs. a regular
integer in <code class="docutils literal notranslate"><span class="pre">MPI_Attr_get</span></code>.</p>
</div>
<div class="section" id="mpi-attr-delete">
<span id="label-mpi-attr-delete"></span><h2><span class="section-number">9.6.6. </span>MPI_Attr_delete<a class="headerlink" href="#mpi-attr-delete" title="Permalink to this heading"></a></h2>
<p>C and Fortran bindings are identical for <code class="docutils literal notranslate"><span class="pre">MPI_Attr_delete</span></code> and
<code class="docutils literal notranslate"><span class="pre">MPI_Comm_delete_attr</span></code>, hence developers should be able to just
directly substitute one function call by the other.</p>
</div>
<div class="section" id="mpi-info-get">
<span id="label-mpi-info-get"></span><h2><span class="section-number">9.6.7. </span>MPI_Info_get<a class="headerlink" href="#mpi-info-get" title="Permalink to this heading"></a></h2>
<p>Applications should replace the use of <code class="docutils literal notranslate"><span class="pre">MPI_Info_get</span></code> with <code class="docutils literal notranslate"><span class="pre">MPI_Info_get_string</span></code>,
but the usage differs slightly. See the example below.</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="n">MPI_Info</span><span class="w"> </span><span class="n">info</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// Create an info object using MPI_Info_create()</span>
<span class="w"> </span><span class="p">...</span>
<span class="w"> </span><span class="c1">// Retrieve the the value of a provided key later in the code</span>
<span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="n">key</span><span class="p">[]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"my_key"</span><span class="p">;</span>
<span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="n">value</span><span class="p">[</span><span class="mi">64</span><span class="p">];</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">valuelen</span><span class="o">=</span><span class="mi">64</span><span class="p">;</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">flag</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// Old way</span>
<span class="w"> </span><span class="n">MPI_Info_get</span><span class="p">(</span><span class="n">info</span><span class="p">,</span><span class="w"> </span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="n">valuelen</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">value</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">flag</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// New way</span>
<span class="w"> </span><span class="c1">// Note that we pass the address of valuelen with</span>
<span class="w"> </span><span class="c1">// the new interfaces, since the variable will</span>
<span class="w"> </span><span class="c1">// contain the length of the value string after</span>
<span class="w"> </span><span class="c1">// the function call.</span>
<span class="w"> </span><span class="n">MPI_Info_get_string</span><span class="p">(</span><span class="n">info</span><span class="p">,</span><span class="w"> </span><span class="n">key</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">valuelen</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">value</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">flag</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="mpi-info-get-valuelen">
<span id="label-mpi-info-get-valuelen"></span><h2><span class="section-number">9.6.8. </span>MPI_Info_get_valuelen<a class="headerlink" href="#mpi-info-get-valuelen" title="Permalink to this heading"></a></h2>
<p><code class="docutils literal notranslate"><span class="pre">MPI_Info_get_valuelen</span></code> has been deprecated since the new function
<code class="docutils literal notranslate"><span class="pre">MPI_Info_get_string</span></code> also returns the length of the value string.
Please refer to the example shown in <a class="reference internal" href="#label-mpi-info-get"><span class="std std-ref">MPI_INFO_GET</span></a>.</p>
</div>
<div class="section" id="mpi-sizeof">
<span id="label-mpi-sizeof"></span><h2><span class="section-number">9.6.9. </span>MPI_Sizeof<a class="headerlink" href="#mpi-sizeof" title="Permalink to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">MPI_SIZEOF</span></code> construct in Fortran has been deprected since there
are standard Fortran language constructs such as <code class="docutils literal notranslate"><span class="pre">c_sizeof</span></code> and
<code class="docutils literal notranslate"><span class="pre">storage_size</span></code> that can be used instead.</p>
</div>
<div class="section" id="mpi-comm-errhandler-fn-mpi-file-errhandler-fn-mpi-win-errhandler-fn">
<span id="label-errhandler-fn"></span><h2><span class="section-number">9.6.10. </span>MPI_Comm_errhandler_fn, MPI_File_errhandler_fn, MPI_Win_errhandler_fn<a class="headerlink" href="#mpi-comm-errhandler-fn-mpi-file-errhandler-fn-mpi-win-errhandler-fn" title="Permalink to this heading"></a></h2>
<p>The following function typedefs have been deprecated and are superseded by new
names. Other than the typedef names, the function signatures are exactly the same; the
names were updated to match conventions of other function typedef names.</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">MPI_Comm_errhandler_fn</span></code> → <code class="docutils literal notranslate"><span class="pre">MPI_Comm_errhandler_function</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MPI_File_errhandler_fn</span></code> → <code class="docutils literal notranslate"><span class="pre">MPI_File_errhandler_function</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MPI_Win_errhandler_fn</span></code> → <code class="docutils literal notranslate"><span class="pre">MPI_Win_errhandler_function</span></code></p></li>
</ul>
</div>
</div>
</div>
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