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<p class="MsoNormal">I would like to be able to use Linux Huge pages in JEMalloc. It could have significant benefit for some programs performance.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The case I tested is running Suricata (<a href="http://suricata-ids.org/">http://suricata-ids.org/</a>) on the Tile-Gx architecture (<a href="http://www.tilera.com/products/processors/TILE-Gx_Family">http://www.tilera.com/products/processors/TILE-Gx_Family</a>),
but it should be similar on other architectures. The glibc allocator on Linux allows using Huge pages with malloc() by running the program with “hugectl –heap”. I have measured performance for two test cases under three conditions:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Glibc 2.12, no huge pages (baseline)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Glibc2 2.12, with 16MB huge pages<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>JEMalloc, no huge pages<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">JEMalloc gives a 4.7% increase for one test case and 5.6% increase for the other over baseline.<o:p></o:p></p>
<p class="MsoNormal">Hugepages gives a 27.2% and 25.3% increase over baseline for the same two test cases.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, JEMalloc is better than glibc malloc, but much worse than glibc malloc with hugepages.<o:p></o:p></p>
<p class="MsoNormal"><br>
Ideally, JEMalloc with Huge pages would be the best.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">-Ken<o:p></o:p></p>
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