Commit db4da6a2 authored by Tomek Mrugalski's avatar Tomek Mrugalski 🛰
Browse files

[2143] Minor changes after review.

parent 7a60b578
......@@ -237,6 +237,14 @@ Possible command-line parameters:
</para>
<para>Synchronous operation requires database backend to
physically store changes to disk before proceeding. This
property ensures that no data is lost in case of the server
failure. Unfortunately, it slows operation
considerably. Asynchronous mode allows database to write data at
a later time (usually controlled by the database engine on OS
disk buffering mechanism).</para>
<section>
<title>MySQL tweaks</title>
......@@ -315,14 +323,16 @@ Possible command-line parameters:
</section>
<section id="memfile-ubench">
<title>memfile-ubench</title>
<para>The memfile backend is a custom backend that
somewhat mimics operation of ISC DHCP4. It implements in-memory
storage using standard C++ and boost mechanisms (std::map and
boost::shared_ptr&lt;&gt;). All database changes are also
written to a lease file, which is strictly write-only. This
approach takes advantage of the fact that simple append is faster
than edition with potential whole file relocation.</para>
<title>memfile-ubench</title> <para>The memfile backend is a
custom backend that somewhat mimics operation of ISC DHCP4. It
implements in-memory storage using standard C++ and boost
mechanisms (std::map and boost::shared_ptr&lt;&gt;). All
database changes are also written to a lease file, which is
strictly write-only. This approach takes advantage of the fact
that file append operation is faster than modifications introduced
in the middle of the file (as it often requires moving all data
after modified point, effectively requiring writing large parts of
the whole file, not just changed fragment).</para>
<section id="memfile-tweaks">
<title>memfile tweaks</title>
......@@ -393,31 +403,31 @@ SQLite version: 3.7.9sourceid version is 2011-11-01 00:52:41 c7c6050ef060877ebe7
<row>
<entry>MySQL</entry>
<entry>1,000</entry>
<entry>31.603978</entry>
<entry> 0.116612</entry>
<entry>27.964191</entry>
<entry>27.695209</entry>
<entry>21.844998</entry>
<entry>31.604</entry>
<entry> 0.117</entry>
<entry>27.964</entry>
<entry>27.695</entry>
<entry>21.845</entry>
</row>
<row>
<entry>SQLite</entry>
<entry>1,000</entry>
<entry>61.421356</entry>
<entry> 0.033283</entry>
<entry>59.476638</entry>
<entry>56.034150</entry>
<entry>44.241357</entry>
<entry>61.421</entry>
<entry> 0.033</entry>
<entry>59.477</entry>
<entry>56.034</entry>
<entry>44.241</entry>
</row>
<row>
<entry>memfile</entry>
<entry>1,000</entry>
<entry>38.223757</entry>
<entry> 0.000817</entry>
<entry>38.041153</entry>
<entry>38.017293</entry>
<entry>28.570755</entry>
<entry>38.224</entry>
<entry> 0.001</entry>
<entry>38.041</entry>
<entry>38.017</entry>
<entry>28.571</entry>
</row>
</tbody>
......@@ -453,31 +463,31 @@ SQLite version: 3.7.9sourceid version is 2011-11-01 00:52:41 c7c6050ef060877ebe7
<row>
<entry>MySQL</entry>
<entry>100,000</entry>
<entry>10.584842</entry>
<entry>10.386402</entry>
<entry>10.062384</entry>
<entry> 8.890197</entry>
<entry> 9.980956</entry>
<entry>10.585</entry>
<entry>10.386</entry>
<entry>10.062</entry>
<entry> 8.890</entry>
<entry> 9.981</entry>
</row>
<row>
<entry>SQLite</entry>
<entry>100,000</entry>
<entry> 3.710356</entry>
<entry> 3.159129</entry>
<entry> 2.865354</entry>
<entry> 2.439406</entry>
<entry> 3.043561</entry>
<entry> 3.710</entry>
<entry> 3.159</entry>
<entry> 2.865</entry>
<entry> 2.439</entry>
<entry> 3.044</entry>
</row>
<row>
<entry>memfile</entry>
<entry>1,000,000</entry>
<entry> 1.299642</entry>
<entry> 0.039330</entry>
<entry> 1.307112</entry>
<entry> 1.277641</entry>
<entry> 0.980931</entry>
<entry> 1.300</entry>
<entry> 0.039</entry>
<entry> 1.307</entry>
<entry> 1.278</entry>
<entry> 0.981</entry>
</row>
</tbody>
......@@ -651,7 +661,7 @@ SQLite version: 3.7.9sourceid version is 2011-11-01 00:52:41 c7c6050ef060877ebe7
<entry>memfile</entry>
<entry>1,000</entry>
<entry>39.564</entry>
<entry> 0.000724</entry>
<entry> 0.001</entry>
<entry>39.543</entry>
<entry>39.326</entry>
<entry>29.608</entry>
......
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