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OpenBLAS
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<h1>Build system</h1>
<p>This page describes the Make-based build, which is the default/authoritative
build method. Note that the OpenBLAS repository also supports building with
CMake (not described here) - that generally works and is tested, however there
may be small differences between the Make and CMake builds.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This page is made by someone who is not the developer and should not be considered as an official documentation of the build system. For getting the full picture, it is best to read the Makefiles and understand them yourself.</p>
@@ -656,13 +715,23 @@ USE_OPENMP - Use OpenMP as multithreading backend
NUM_THREADS - define this to the maximum number of parallel threads you expect to need (defaults to the number of cores in the build cpu)
NUM_PARALLEL - define this to the number of OpenMP instances that your code may use for parallel calls into OpenBLAS (default 1,see below)
</code></pre></div>
<p>OpenBLAS uses a fixed set of memory buffers internally, used for communicating and compiling partial results from individual threads.
For efficiency, the management array structure for these buffers is sized at build time - this makes it necessary to know in advance how
many threads need to be supported on the target system(s).
With OpenMP, there is an additional level of complexity as there may be calls originating from a parallel region in the calling program. If OpenBLAS gets called from a single parallel region, it runs single-threaded automatically to avoid overloading the system by fanning out its own set of threads.
In the case that an OpenMP program makes multiple calls from independent regions or instances in parallel, this default serialization is not
sufficient as the additional caller(s) would compete for the original set of buffers already in use by the first call.
So if multiple OpenMP runtimes call into OpenBLAS at the same time, then only one of them will be able to make progress while all the rest of them spin-wait for the one available buffer. Setting NUM_PARALLEL to the upper bound on the number of OpenMP runtimes that you can have in a process ensures that there are a sufficient number of buffer sets available</p>
<p>OpenBLAS uses a fixed set of memory buffers internally, used for communicating
and compiling partial results from individual threads. For efficiency, the
management array structure for these buffers is sized at build time - this
makes it necessary to know in advance how many threads need to be supported on
the target system(s).</p>
<p>With OpenMP, there is an additional level of complexity as there may be calls
originating from a parallel region in the calling program. If OpenBLAS gets
called from a single parallel region, it runs single-threaded automatically to
avoid overloading the system by fanning out its own set of threads. In the case
that an OpenMP program makes multiple calls from independent regions or
instances in parallel, this default serialization is not sufficient as the
additional caller(s) would compete for the original set of buffers already in
use by the first call. So if multiple OpenMP runtimes call into OpenBLAS at the
same time, then only one of them will be able to make progress while all the
rest of them spin-wait for the one available buffer. Setting <code>NUM_PARALLEL</code> to
the upper bound on the number of OpenMP runtimes that you can have in a process
ensures that there are a sufficient number of buffer sets available.</p>
@@ -670,6 +739,38 @@ So if multiple OpenMP runtimes call into OpenBLAS at the same time, then only on
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@@ -691,12 +792,42 @@ So if multiple OpenMP runtimes call into OpenBLAS at the same time, then only on
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@@ -709,7 +840,7 @@ So if multiple OpenMP runtimes call into OpenBLAS at the same time, then only on
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