<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2">Greetings:</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><br></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2">I&#39;ve been tinkering with the <span style="font-family:courier new,monospace">--coverage</span> flag to capture runtime statistics which can then be used to compile zeek with branch prediction hints.  My preliminary tests indicate a substantial performance increase, enough to justify engaging the zeek community.</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><br></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2">I noticed that the configure script includes --enable-coverage, which doesn&#39;t quite do what I want, as it compiles with debug support. and I&#39;m most interested in optimization for production use.</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><br></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2">In brief, I&#39;ve been testing:</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><br></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138">./configure --enable-coverage<span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><br></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif">for the initial compile, then run against pcaps and live traffic, and use that profiling data to recompile:</font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><br></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1">CFLAGS=’-fprofile-use -fprofile-correction -flto’ CXXFLAGS=’-fprofile-use -fprofile-correction -flto’ ./configure</span></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><br></span></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif">with a substantial performance boost against a regular compile (can additionally do <span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-f05ff23e-7fff-317b-0adf-edb55f855529">--build-type=Release<font face="arial,sans-serif"> for compiling with -O3 flag)</font></span>.</font></span></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif"><br></font></span></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif">Has anyone else tinkered with this? - I would be happy to elaborate, and discuss with others.</font></span></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif"><br></font></span></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="2"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif">Jim</font></span></font></span></span></font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif"><br></font></span></font></span></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif"><br></font></span></font></span></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-9844aed3-7fff-0db5-335c-354769361138"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-797e4874-7fff-ce19-5403-00ebc028258c"><font face="arial,sans-serif"><span style="font-size:11pt;font-family:&quot;Courier New&quot;;color:rgb(0,0,0);background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap" id="gmail-docs-internal-guid-7648282e-7fff-004c-bafa-59f64fdd4dd1"><font face="arial,sans-serif"></font><br></span></font></span></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div></div>