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Extensions
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Extensions
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BLAS-like extensions
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Utility functions
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Redistributing OpenBLAS
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Table of contents
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<li class="md-nav__item">
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<a href="#blas-like-extensions" class="md-nav__link">
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<span class="md-ellipsis">
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BLAS-like extensions
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#bfloat16-functionality" class="md-nav__link">
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<span class="md-ellipsis">
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bfloat16 functionality
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#utility-functions" class="md-nav__link">
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<span class="md-ellipsis">
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Utility functions
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<h1>Extensions</h1>
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<p>OpenBLAS for the most part contains implementations of the reference (Netlib)
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BLAS, CBLAS, LAPACK and LAPACKE interfaces. A few OpenBLAS-specific functions
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are also provided however, which mostly can be seen as "BLAS extensions".
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This page documents those non-standard APIs.</p>
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<h2 id="blas-like-extensions">BLAS-like extensions</h2>
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<table>
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<thead>
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<tr>
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<th>Routine</th>
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<th style="text-align: left;">Data Types</th>
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<th style="text-align: left;">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>?axpby</td>
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<td style="text-align: left;">s,d,c,z</td>
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<td style="text-align: left;">like axpy with a multiplier for y</td>
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</tr>
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<tr>
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<td>?gemm3m</td>
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<td style="text-align: left;">c,z</td>
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<td style="text-align: left;">gemm3m</td>
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</tr>
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<tr>
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<td>?imatcopy</td>
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<td style="text-align: left;">s,d,c,z</td>
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<td style="text-align: left;">in-place transpositon/copying</td>
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</tr>
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<tr>
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<td>?omatcopy</td>
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<td style="text-align: left;">s,d,c,z</td>
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<td style="text-align: left;">out-of-place transpositon/copying</td>
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</tr>
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<tr>
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<td>?geadd</td>
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<td style="text-align: left;">s,d,c,z</td>
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<td style="text-align: left;">matrix add</td>
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</tr>
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<tr>
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<td>?gemmt</td>
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<td style="text-align: left;">s,d,c,z</td>
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<td style="text-align: left;">gemm but only a triangular part updated</td>
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</tr>
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</tbody>
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</table>
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<h2 id="bfloat16-functionality">bfloat16 functionality</h2>
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<p>BLAS-like and conversion functions for <code>bfloat16</code> (available when OpenBLAS was compiled with <code>BUILD_BFLOAT16=1</code>):</p>
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<ul>
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<li><code>void cblas_sbstobf16</code> converts a float array to an array of bfloat16 values by rounding</li>
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<li><code>void cblas_sbdtobf16</code> converts a double array to an array of bfloat16 values by rounding</li>
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<li><code>void cblas_sbf16tos</code> converts a bfloat16 array to an array of floats</li>
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<li><code>void cblas_dbf16tod</code> converts a bfloat16 array to an array of doubles</li>
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<li><code>float cblas_sbdot</code> computes the dot product of two bfloat16 arrays</li>
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<li><code>void cblas_sbgemv</code> performs the matrix-vector operations of GEMV with the input matrix and X vector as bfloat16</li>
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<li><code>void cblas_sbgemm</code> performs the matrix-matrix operations of GEMM with both input arrays containing bfloat16</li>
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</ul>
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<h2 id="utility-functions">Utility functions</h2>
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<ul>
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<li><code>openblas_get_num_threads</code></li>
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<li><code>openblas_set_num_threads</code></li>
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<li><code>int openblas_get_num_procs(void)</code> returns the number of processors available on the system (may include "hyperthreading cores")</li>
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<li><code>int openblas_get_parallel(void)</code> returns 0 for sequential use, 1 for platform-based threading and 2 for OpenMP-based threading</li>
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<li><code>char * openblas_get_config()</code> returns the options OpenBLAS was built with, something like <code>NO_LAPACKE DYNAMIC_ARCH NO_AFFINITY Haswell</code></li>
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<li><code>int openblas_set_affinity(int thread_index, size_t cpusetsize, cpu_set_t *cpuset)</code> sets the CPU affinity mask of the given thread
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to the provided cpuset. Only available on Linux, with semantics identical to <code>pthread_setaffinity_np</code>.</li>
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</ul>
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">August 4, 2023</span>
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