https://wiki.haidhi.my.id/wiki/index.php?action=history&feed=atom&title=MPI%3A_gather 2026-11-01T22:44:35Z Revision history for this page on the wiki MediaWiki 1.43.0 https://wiki.haidhi.my.id/wiki/index.php?title=MPI:_gather&diff=616&oldid=prev 2026-03-29T02:07:58Z

<p>Created page with &quot;Kebalikan dari scatter &lt;syntaxhighlight lang=cpp&gt; #include &lt;mpi.h&gt; #include &lt;iostream&gt; #include &lt;vector&gt; extern &quot;C&quot; { void array_mul(double* arr_a, double* arr_b, int size); } int main() { MPI_Init(NULL, NULL); int world_rank, world_size; MPI_Comm_rank(MPI_COMM_WORLD, &amp;world_rank); MPI_Comm_size(MPI_COMM_WORLD, &amp;world_size); int total_elements = 8; int data_per_process = total_elements / world_size; std::vector&lt;double&gt; send_buffer_...&quot;</p> <p><b>New page</b></p><div>Kebalikan dari scatter<br /> <br /> &lt;syntaxhighlight lang=cpp&gt;<br /> #include &lt;mpi.h&gt;<br /> #include &lt;iostream&gt;<br /> #include &lt;vector&gt;<br /> <br /> extern &quot;C&quot; {<br /> void array_mul(double* arr_a, double* arr_b, int size);<br /> }<br /> <br /> <br /> int main() {<br /> MPI_Init(NULL, NULL);<br /> <br /> int world_rank, world_size;<br /> MPI_Comm_rank(MPI_COMM_WORLD, &amp;world_rank);<br /> MPI_Comm_size(MPI_COMM_WORLD, &amp;world_size);<br /> <br /> int total_elements = 8;<br /> int data_per_process = total_elements / world_size; <br /> <br /> std::vector&lt;double&gt; send_buffer_a;<br /> std::vector&lt;double&gt; send_buffer_b;<br /> std::vector&lt;double&gt; final_result;<br /> <br /> if (world_rank == 0) {<br /> send_buffer_a = {10.0, 20.0, 30.0, 40.0, 50.0, 60.0, 70.0, 80.0};<br /> send_buffer_b = {2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0};<br /> final_result.resize(total_elements); // siapin tempat<br /> }<br /> <br /> std::vector&lt;double&gt; recv_buffer_a(data_per_process);<br /> std::vector&lt;double&gt; recv_buffer_b(data_per_process);<br /> <br /> MPI_Scatter(send_buffer_a.data(), data_per_process, MPI_DOUBLE,<br /> recv_buffer_a.data(), data_per_process, MPI_DOUBLE, 0, MPI_COMM_WORLD);<br /> MPI_Scatter(send_buffer_b.data(), data_per_process, MPI_DOUBLE,<br /> recv_buffer_b.data(), data_per_process, MPI_DOUBLE, 0, MPI_COMM_WORLD);<br /> <br /> std::vector&lt;double&gt; original_a = recv_buffer_a;<br /> <br /> array_mul(recv_buffer_a.data(), recv_buffer_b.data(), data_per_process);<br /> <br /> // GATHER: Kumpulkan semua hasil dari recv_buffer_a ke final_result di Rank 0<br /> MPI_Gather(<br /> recv_buffer_a.data(), data_per_process, MPI_DOUBLE,<br /> final_result.data(), data_per_process, MPI_DOUBLE, 0, MPI_COMM_WORLD);<br /> <br /> <br /> // OUTPUT: Cek hasilnya di Rank 0<br /> if (world_rank == 0) {<br /> printf(&quot;\n=== HASIL AKHIR DI RANK 0 ===\n&quot;);<br /> for(int i = 0; i &lt; total_elements; i++) {<br /> printf(&quot;Elemen ke-%d: %.1f\n&quot;, i, final_result[i]);<br /> }<br /> printf(&quot;=============================\n&quot;);<br /> }<br /> <br /> MPI_Finalize();<br /> return 0;<br /> }<br /> &lt;/syntaxhighlight&gt;</div>

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