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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2881/">https://reviewboard.asterisk.org/r/2881/</a>
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<a href="https://reviewboard.asterisk.org/r/2881/diff/2/?file=46751#file46751line91" style="color: black; font-weight: bold; text-decoration: underline;">/team/dlee/performance/include/asterisk/sem.h</a>
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(Diff revision 2)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \param pshared Pass true (nonzero) to share this thread between processes.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * Not be supported on all platforms, so be wary!</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'd add a comment here that this is here to protect the ABI for when we need to add process level semaphores. Currently, however, the implementation doesn't support it.</pre>
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<a href="https://reviewboard.asterisk.org/r/2881/diff/2/?file=46757#file46757line161" style="color: black; font-weight: bold; text-decoration: underline;">/team/dlee/performance/main/taskprocessor.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_cli_entry taskprocessor_clis[] = {</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">while</span> <span class="p">(</span><span class="o">!</span><span class="n">pvt</span><span class="o">-></span><span class="n">wake_up</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_cond_wait</span><span class="p">(</span><span class="o">&</span><span class="n">pvt</span><span class="o">-></span><span class="n">cond</span><span class="p">,</span> <span class="n">lock</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">default_listener_pvt_destroy</span><span class="p">(</span><span class="n">pvt</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Your call, but since this is only called in one place, you could probably combine these two functions now.
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<a href="https://reviewboard.asterisk.org/r/2881/diff/2/?file=46757#file46757line195" style="color: black; font-weight: bold; text-decoration: underline;">/team/dlee/performance/main/taskprocessor.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_cli_entry taskprocessor_clis[] = {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="cm">/* Free the shutdown reference */</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Just for easier maintenance, reference in the comment that this is bumped in default_listener_shutdown.
(You could also use ao2_t_ref and put some tags on these reference changes, as correlating a pair of ref change across multiple functions is tricky)</pre>
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<p>- Matt</p>
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<p>On September 27th, 2013, 7:58 p.m. UTC, David Lee wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By David Lee.</div>
<p style="color: grey;"><i>Updated Sept. 27, 2013, 7:58 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This patch optimizes taskprocessor to use a semaphore for signaling,
which the OS can do a better job at managing contention and waiting
that we can with a mutex and condition.
The taskprocessor execution was also slightly optimized to reduce the
number of locks taken.
The only observable difference in the taskprocessor implementation is
that when the final reference to the taskprocessor goes away, it will
execute all tasks to completion instead of discarding the unexecuted
tasks.
For systems where unnamed semaphores are not supported, a really
simple semaphore implementation is provided. (Which gives identical
performance as the original taskprocessor implementation).
The way we ended up implementing Stasis caused the threadpool to be a
burden instead of a boost to performance. This was switched to just
use taskprocessors directly for subscriptions.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Unit tests pass.
Same performance test as from https://reviewboard.asterisk.org/r/2873/</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/team/dlee/performance/configs/stasis.conf.sample <span style="color: grey">(399869)</span></li>
<li>/team/dlee/performance/configure <span style="color: grey">(UNKNOWN)</span></li>
<li>/team/dlee/performance/configure.ac <span style="color: grey">(399869)</span></li>
<li>/team/dlee/performance/include/asterisk/autoconfig.h.in <span style="color: grey">(399869)</span></li>
<li>/team/dlee/performance/include/asterisk/sem.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>/team/dlee/performance/include/asterisk/stasis.h <span style="color: grey">(399869)</span></li>
<li>/team/dlee/performance/include/asterisk/taskprocessor.h <span style="color: grey">(399869)</span></li>
<li>/team/dlee/performance/main/sem.c <span style="color: grey">(PRE-CREATION)</span></li>
<li>/team/dlee/performance/main/stasis.c <span style="color: grey">(399869)</span></li>
<li>/team/dlee/performance/main/stasis_config.c <span style="color: grey">(399869)</span></li>
<li>/team/dlee/performance/main/taskprocessor.c <span style="color: grey">(399869)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2881/diff/" style="margin-left: 3em;">View Diff</a></p>
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