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combine arrays on different cores
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<p>The way to combine arrays in different cores to a big array by MPI is using MPI_Allgatherv. An example I would like to test is like this.</p>
<p>Core 1 : 1</p>
<p>Core 2 : 2 2</p>
<p>Core 3 : 3 3 3</p>
<p>Core 4 : 4 4 4 4</p>
<p>Core 5 ...</p>
<p>After combine all the arrays, I will get</p>
<p>1 2 2 3 3 3 4 4 4 4 5 5 ...</p>
<p>Here is the code(test_allgatherv.c) and Makefile for this calculation. Pay attention to displ_list.</p>
<div class="highlight"><pre><span></span><code><span class="n">#include</span><span class="w"> </span><span class="ss">"mpi.h"</span><span class="w"></span>
<span class="n">#include</span><span class="w"> </span><span class="o"><</span><span class="n">stdio</span><span class="p">.</span><span class="n">h</span><span class="o">></span><span class="w"></span>
<span class="n">#include</span><span class="w"> </span><span class="o"><</span><span class="n">stdlib</span><span class="p">.</span><span class="n">h</span><span class="o">></span><span class="w"></span>
<span class="nc">int</span><span class="w"> </span><span class="n">main</span><span class="p">(</span><span class="nc">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="nc">char</span><span class="w"> </span><span class="o">*</span><span class="n">argv</span><span class="err">[]</span><span class="p">)</span><span class="w"></span>
<span class="err">{</span><span class="w"></span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="n">my_rank</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">MPI</span><span class="w"> </span><span class="nf">rank</span><span class="w"></span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="k">size</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">MPI</span><span class="w"> </span><span class="k">size</span><span class="w"></span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="n">i</span><span class="p">;</span><span class="w"> </span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="n">local_array</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="k">array</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="k">local</span><span class="w"> </span><span class="n">core</span><span class="w"> </span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="n">local_num</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">num</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">elements</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="k">local</span><span class="w"> </span><span class="k">array</span><span class="w"></span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="n">local_num_list</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">list</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">local_num</span><span class="w"> </span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="n">displ_list</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">displ_list</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">global_array</span><span class="w"></span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="n">global_array</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="k">array</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="k">global</span><span class="w"></span>
<span class="w"> </span><span class="nc">int</span><span class="w"> </span><span class="n">global_num</span><span class="p">;</span><span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="nf">sum</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">local_num</span><span class="w"></span>
<span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">MPI</span><span class="w"> </span><span class="n">related</span><span class="w"> </span><span class="n">variables</span><span class="w"></span>
<span class="w"> </span><span class="n">MPI_Init</span><span class="w"> </span><span class="p">(</span><span class="o">&</span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">argv</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">MPI_Comm_rank</span><span class="w"> </span><span class="p">(</span><span class="n">MPI_COMM_WORLD</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">my_rank</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">MPI_Comm_size</span><span class="p">(</span><span class="n">MPI_COMM_WORLD</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="k">size</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">generate</span><span class="w"> </span><span class="k">local</span><span class="w"> </span><span class="k">array</span><span class="w"></span>
<span class="w"> </span><span class="n">local_num</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">my_rank</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">local_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="w"> </span><span class="n">malloc</span><span class="w"> </span><span class="p">(</span><span class="n">local_num</span><span class="o">*</span><span class="n">sizeof</span><span class="p">(</span><span class="nc">int</span><span class="p">));</span><span class="w"></span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="n">i</span><span class="o"><</span><span class="n">local_num</span><span class="p">;</span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="err">{</span><span class="w"></span>
<span class="w"> </span><span class="n">local_array</span><span class="o">[</span><span class="n">i</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">local_num</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="ss">"%d \n"</span><span class="p">,</span><span class="w"> </span><span class="n">local_num</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="err">}</span><span class="w"></span>
<span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="n">calculate</span><span class="w"> </span><span class="n">global_num</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nf">sum</span><span class="o">[</span><span class="n">local_num</span><span class="o">]</span><span class="w"></span>
<span class="w"> </span><span class="n">MPI_Allreduce</span><span class="p">(</span><span class="o">&</span><span class="n">local_num</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">global_num</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_INT</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_SUM</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_COMM_WORLD</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">MPI_Allgatherv</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">calculation</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">displ_list</span><span class="w"> </span><span class="k">is</span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="n">little</span><span class="w"> </span><span class="n">tricky</span><span class="w"></span>
<span class="w"> </span><span class="n">global_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="w"> </span><span class="n">malloc</span><span class="w"> </span><span class="p">(</span><span class="n">global_num</span><span class="o">*</span><span class="n">sizeof</span><span class="p">(</span><span class="nc">int</span><span class="p">));</span><span class="w"></span>
<span class="w"> </span><span class="n">displ_list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="w"> </span><span class="n">malloc</span><span class="w"> </span><span class="p">(</span><span class="k">size</span><span class="o">*</span><span class="n">sizeof</span><span class="p">(</span><span class="nc">int</span><span class="p">));</span><span class="w"></span>
<span class="w"> </span><span class="n">local_num_list</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="nc">int</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="w"> </span><span class="n">malloc</span><span class="w"> </span><span class="p">(</span><span class="k">size</span><span class="o">*</span><span class="n">sizeof</span><span class="p">(</span><span class="nc">int</span><span class="p">));</span><span class="w"></span>
<span class="w"> </span><span class="n">MPI_Allgather</span><span class="p">(</span><span class="o">&</span><span class="n">local_num</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_INT</span><span class="p">,</span><span class="w"> </span><span class="n">local_num_list</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_INT</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_COMM_WORLD</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">displ_list</span><span class="o">[</span><span class="n">0</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="o">=</span><span class="mi">1</span><span class="p">;</span><span class="n">i</span><span class="o"><</span><span class="k">size</span><span class="p">;</span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="err">{</span><span class="w"></span>
<span class="w"> </span><span class="n">displ_list</span><span class="o">[</span><span class="n">i</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">displ_list</span><span class="o">[</span><span class="n">i-1</span><span class="o">]</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">local_num_list</span><span class="o">[</span><span class="n">i-1</span><span class="o">]</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="err">}</span><span class="w"></span>
<span class="w"> </span><span class="n">MPI_Allgatherv</span><span class="p">(</span><span class="n">local_array</span><span class="p">,</span><span class="w"> </span><span class="n">local_num</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_INT</span><span class="p">,</span><span class="w"> </span><span class="n">global_array</span><span class="p">,</span><span class="w"> </span><span class="n">local_num_list</span><span class="p">,</span><span class="w"> </span><span class="n">displ_list</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_INT</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_COMM_WORLD</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="o">//</span><span class="w"> </span><span class="k">output</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">global_array</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">my_rank</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="err">{</span><span class="w"></span>
<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="ss">"after MPI_Allgatherv\n"</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="n">i</span><span class="o"><</span><span class="n">global_num</span><span class="p">;</span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="err">{</span><span class="w"></span>
<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="ss">"%d %d\n"</span><span class="p">,</span><span class="n">i</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="n">global_array</span><span class="o">[</span><span class="n">i</span><span class="o">]</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="err">}</span><span class="w"></span>
<span class="w"> </span><span class="err">}</span><span class="w"></span>
<span class="w"> </span><span class="n">MPI_Finalize</span><span class="p">();</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span>
<span class="err">}</span><span class="w"></span>
</code></pre></div>
<p>And the Makefile.</p>
<div class="highlight"><pre><span></span><code><span class="nf">CC</span><span class="err">=</span><span class="no">mpicc</span>
<span class="nf">CFLAGS</span><span class="err">=</span><span class="p">-</span><span class="no">c</span> <span class="p">-</span><span class="no">Wall</span>
<span class="nf">LDFLAGS</span><span class="err">=</span>
<span class="nf">SOURCES</span><span class="err">=</span><span class="no">test_allgatherv.c</span>
<span class="nf">OBJECTS</span><span class="err">=</span><span class="no">$</span><span class="p">(</span><span class="no">SOURCES</span><span class="p">:.</span><span class="no">c</span><span class="err">=</span><span class="no">.o</span><span class="p">)</span>
<span class="nf">EXECUTABLE</span><span class="err">=</span><span class="no">test_allgatherv</span>
<span class="nl">all:</span> <span class="nf">$</span><span class="p">(</span><span class="no">SOURCES</span><span class="p">)</span> <span class="no">$</span><span class="p">(</span><span class="no">EXECUTABLE</span><span class="p">)</span>
<span class="nf">$</span><span class="p">(</span><span class="no">EXECUTABLE</span><span class="p">):</span> <span class="no">$</span><span class="p">(</span><span class="no">OBJECTS</span><span class="p">)</span>
<span class="nf">$</span><span class="p">(</span><span class="no">CC</span><span class="p">)</span> <span class="no">$</span><span class="p">(</span><span class="no">LDFLAGS</span><span class="p">)</span> <span class="no">$</span><span class="p">(</span><span class="no">OBJECTS</span><span class="p">)</span> <span class="p">-</span><span class="no">o</span> <span class="no">$@</span>
<span class="nl">.c.o:</span>
<span class="nf">$</span><span class="p">(</span><span class="no">CC</span><span class="p">)</span> <span class="no">$</span><span class="p">(</span><span class="no">CFLAGS</span><span class="p">)</span> <span class="no">$</span><span class="err"><</span> <span class="p">-</span><span class="no">o</span> <span class="no">$@</span>
</code></pre></div>
<p>After compiling, run the job by</p>
<div class="highlight"><pre><span></span><code>mpirun -n 8 ./test_allgatherv
</code></pre></div>
<p>I got the correct result</p>
<div class="highlight"><pre><span></span><code><span class="mf">1</span>
<span class="mf">2</span>
<span class="mf">2</span>
<span class="mf">4</span>
<span class="mf">4</span>
<span class="mf">4</span>
<span class="mf">4</span>
<span class="mf">5</span>
<span class="mf">5</span>
<span class="mf">5</span>
<span class="mf">5</span>
<span class="mf">5</span>
<span class="mf">8</span>
<span class="mf">8</span>
<span class="mf">8</span>
<span class="mf">8</span>
<span class="mf">8</span>
<span class="mf">8</span>
<span class="mf">8</span>
<span class="mf">8</span>
<span class="mf">3</span>
<span class="mf">3</span>
<span class="mf">3</span>
<span class="mf">6</span>
<span class="mf">6</span>
<span class="mf">6</span>
<span class="mf">6</span>
<span class="mf">6</span>
<span class="mf">6</span>
<span class="mf">7</span>
<span class="mf">7</span>
<span class="mf">7</span>
<span class="mf">7</span>
<span class="mf">7</span>
<span class="mf">7</span>
<span class="mf">7</span>
<span class="n">after</span> <span class="n">MPI_Allgatherv</span>
<span class="mf">0</span> <span class="mf">1</span>
<span class="mf">1</span> <span class="mf">2</span>
<span class="mf">2</span> <span class="mf">2</span>
<span class="mf">3</span> <span class="mf">3</span>
<span class="mf">4</span> <span class="mf">3</span>
<span class="mf">5</span> <span class="mf">3</span>
<span class="mf">6</span> <span class="mf">4</span>
<span class="mf">7</span> <span class="mf">4</span>
<span class="mf">8</span> <span class="mf">4</span>
<span class="mf">9</span> <span class="mf">4</span>
<span class="mf">10</span> <span class="mf">5</span>
<span class="mf">11</span> <span class="mf">5</span>
<span class="mf">12</span> <span class="mf">5</span>
<span class="mf">13</span> <span class="mf">5</span>
<span class="mf">14</span> <span class="mf">5</span>
<span class="mf">15</span> <span class="mf">6</span>
<span class="mf">16</span> <span class="mf">6</span>
<span class="mf">17</span> <span class="mf">6</span>
<span class="mf">18</span> <span class="mf">6</span>
<span class="mf">19</span> <span class="mf">6</span>
<span class="mf">20</span> <span class="mf">6</span>
<span class="mf">21</span> <span class="mf">7</span>
<span class="mf">22</span> <span class="mf">7</span>
<span class="mf">23</span> <span class="mf">7</span>
<span class="mf">24</span> <span class="mf">7</span>
<span class="mf">25</span> <span class="mf">7</span>
<span class="mf">26</span> <span class="mf">7</span>
<span class="mf">27</span> <span class="mf">7</span>
<span class="mf">28</span> <span class="mf">8</span>
<span class="mf">29</span> <span class="mf">8</span>
<span class="mf">30</span> <span class="mf">8</span>
<span class="mf">31</span> <span class="mf">8</span>
<span class="mf">32</span> <span class="mf">8</span>
<span class="mf">33</span> <span class="mf">8</span>
<span class="mf">34</span> <span class="mf">8</span>
<span class="mf">35</span> <span class="mf">8</span>
</code></pre></div>
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