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Block Thread Affinity and Priority - Revision history
2024-03-19T03:24:58Z
Revision history for this page on the wiki
MediaWiki 1.39.5
https://wiki.gnuradio.org/index.php?title=Block_Thread_Affinity_and_Priority&diff=4873&oldid=prev
777arc at 22:43, 12 March 2019
2019-03-12T22:43:51Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 22:43, 12 March 2019</td>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:Usage Manual]]</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Block Thread Affinity ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Block Thread Affinity ==</div></td></tr>
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777arc
https://wiki.gnuradio.org/index.php?title=Block_Thread_Affinity_and_Priority&diff=4226&oldid=prev
777arc: /* Setting Affinity for a gr::hier_block2 */
2018-06-11T05:08:53Z
<p><span dir="auto"><span class="autocomment">Setting Affinity for a gr::hier_block2</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 05:08, 11 June 2018</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l70">Line 70:</td>
<td colspan="2" class="diff-lineno">Line 70:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>thread affinity:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>thread affinity:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>gr::hier_block2::set_processor_affinity(const std::vector<int> &mask)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>gr::hier_block2::set_processor_affinity(const std::vector<int> &mask)</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>gr::hier_block2::unset_processor_affinity()</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>gr::hier_block2::unset_processor_affinity()</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>gr::hier_block2::processor_affinity()</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>gr::hier_block2::processor_affinity()</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Setting and unsetting the affinity does so recursively for every block</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Setting and unsetting the affinity does so recursively for every block</div></td></tr>
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777arc
https://wiki.gnuradio.org/index.php?title=Block_Thread_Affinity_and_Priority&diff=4225&oldid=prev
777arc: /* GNU Radio Block API */
2018-06-11T05:08:33Z
<p><span dir="auto"><span class="autocomment">GNU Radio Block API</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 05:08, 11 June 2018</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l39">Line 39:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Each block has two new data members:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Each block has two new data members:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>threaded: a boolean value that is true if the block is attached to a thread.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>threaded: a boolean value that is true if the block is attached to a thread.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>thread: a gr::thread::gr_thread_t handle to the block's thread.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>thread: a gr::thread::gr_thread_t handle to the block's thread.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A block can set and unset its affinity at any time using the</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A block can set and unset its affinity at any time using the</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>following member functions:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>following member functions:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>gr::block::set_processor_affinity(const std::vector<int> &mask)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>gr::block::set_processor_affinity(const std::vector<int> &mask)</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>gr::block::unset_processor_affinity()</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>gr::block::unset_processor_affinity()</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Where \p mask is a vector of core numbers to set the thread's affinity</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Where \p mask is a vector of core numbers to set the thread's affinity</div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l53">Line 53:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The current core affinity can be retrieved using the member function:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The current core affinity can be retrieved using the member function:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"># </del>gr::block::processor_affinity()</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* </ins>gr::block::processor_affinity()</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>When set before the flowgraph is started, the scheduler will set the</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>When set before the flowgraph is started, the scheduler will set the</div></td></tr>
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777arc
https://wiki.gnuradio.org/index.php?title=Block_Thread_Affinity_and_Priority&diff=4224&oldid=prev
777arc: creation of page, copied from latest usage manual version
2018-06-11T05:07:54Z
<p>creation of page, copied from latest usage manual version</p>
<p><b>New page</b></p><div>== Block Thread Affinity ==<br />
<br />
In the thread-per-block scheduler, you can set the block's core<br />
affinity. Each block can be pinned to a group cores or be set back<br />
to use the standard kernel scheduler.<br />
<br />
The implementation is done by adding new functions to the threading<br />
section of the gnuradio-runtime library:<br />
<br />
gr::thread::gr_thread_t get_current_thread_id();<br />
void thread_bind_to_processor(unsigned int n);<br />
void thread_bind_to_processor(const std::vector<unsigned int> &mask);<br />
void thread_bind_to_processor(gr::thread::gr_thread_t thread, unsigned int n);<br />
void thread_bind_to_processor(gr::thread::gr_thread_t thread, const std::vector<unsigned int> &mask);<br />
void thread_unbind();<br />
void thread_unbind(gr::thread::gr_thread_t thread);<br />
<br />
The ability to set a thread's affinity to a core or groups of cores is<br />
not implemented in the Boost thread library, and so we have made our<br />
own portability library. In particular, the gr::thread::gr_thread_t type is<br />
defined as the thread type for the given system. The other functions<br />
are designed to be portable as well by calling the specific<br />
implementation for the thread affinity for a particular platform.<br />
<br />
There are functions to set a thread to a group of cores. If the thread<br />
is not given, the current thread is used. If a single number is<br />
passed, only that core is set (this is equivalent to a core mask with<br />
just a single value).<br />
<br />
Similarly, there are functions to unset the affinity. This practically<br />
implements the setting of the thread's affinity to all possible<br />
cores. Again, the function that does not take a thread argument unsets<br />
the affinity for the current thread.<br />
<br />
NOTE: Not available on OSX.<br />
<br />
=== GNU Radio Block API ===<br />
<br />
Each block has two new data members:<br />
<br />
# threaded: a boolean value that is true if the block is attached to a thread.<br />
# thread: a gr::thread::gr_thread_t handle to the block's thread.<br />
<br />
A block can set and unset its affinity at any time using the<br />
following member functions:<br />
<br />
# gr::block::set_processor_affinity(const std::vector<int> &mask)<br />
# gr::block::unset_processor_affinity()<br />
<br />
Where \p mask is a vector of core numbers to set the thread's affinity<br />
to.<br />
<br />
The current core affinity can be retrieved using the member function:<br />
<br />
# gr::block::processor_affinity()<br />
<br />
When set before the flowgraph is started, the scheduler will set the<br />
thread's affinity when it is started. When already running, the<br />
block's affinity will be immediately set.<br />
<br />
=== Setting Affinity for a gr::hier_block2 ===<br />
<br />
A hierarchical block (gr::hier_block2) also has a concept of setting<br />
the block thread affinity. Because the hierarchical block itself does<br />
no work and just encapsulates a set of blocks, setting the<br />
hierarchical block's affinity individually sets all blocks inside it<br />
to that affinity setting.<br />
<br />
The gr::hier_block2 class supports the same API interface to the block<br />
thread affinity:<br />
<br />
# gr::hier_block2::set_processor_affinity(const std::vector<int> &mask)<br />
# gr::hier_block2::unset_processor_affinity()<br />
# gr::hier_block2::processor_affinity()<br />
<br />
Setting and unsetting the affinity does so recursively for every block<br />
in the hierarchical block. It is of course possible to individually set<br />
the affinity to any block underneath the hierarchical block. However,<br />
in this case, note that when asking for the current affinity value<br />
using 'processor_affinity()', the code returns the current processor<br />
affinity value of only the first block.<br />
<br />
=== GRC Access ===<br />
<br />
GRC supports the setting of the thread core affinity in a block's<br />
options. Each block now has a field 'Core Affinity' that accepts a<br />
vector (list) of integers and sets the affinity after the block is<br />
constructed.<br />
<br />
Note that GRC does not provide a callback function for changing the<br />
thread core affinity while the flowgraph is running.<br />
<br />
== Setting Thread Priority ==<br />
<br />
Similarly to setting the core affinity for a given block, we can also<br />
set the thread priority. This concept adds three new function calls to<br />
all blocks:<br />
<br />
# gr::block::set_thread_priority(int priority): Sets the current thread priority.<br />
# gr::block::active_thread_priority(): Gets the active priority for the thread.<br />
# gr::block::thread_priority(): Gets the stored thread priority.<br />
<br />
The range of the thread priority might be system dependent, so look to<br />
your system/OS documentation. Linux specifies this range in sched_setscheduler as a value between 1 and 99 where 1 is the lowest<br />
priority and 99 is the highest. POSIX systems can retrieve these min<br />
and max values using sched_get_priority_min and<br />
sched_get_priority_max and may only allow 32 distinct values to be<br />
set.<br />
<br />
NOTE: Not available on Windows or OSX.</div>
777arc