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<head><title>Hard Drive Speed </title>
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<h1>Hard Drive Speed</h1>
<p>Update db4o operation requires disk access and therefore is
very dependent on the disk speed. To emulate a different drive speed we will
use a RAMDISK utility, which creates an alternative storage media in the
memory.</p>
<p MadCap:conditions="Global.Primary:java" />
<p MadCap:conditions="Primary..NET">
<pre class="prettyprint" xml:space="preserve">UpdatePerformanceBenchmark.cs: RunHardDriveTest
private void RunHardDriveTest()
{
System.Console.WriteLine("Update test: hard drive");
int objectsToUpdate = 90;
InitForHardDriveTest();
Clean();
Open(ConfigureDriveTest());
Store();
System.Console.WriteLine("Updating " + objectsToUpdate +
" objects on a hard drive:");
UpdateItems(objectsToUpdate);
Close();
}</pre>
<pre class="prettyprint" xml:space="preserve">UpdatePerformanceBenchmark.cs: InitForHardDriveTest
private void InitForHardDriveTest()
{
_count = 10000;
_depth = 3;
_filePath = "performance.db4o";
_isClientServer = false;
}</pre>
<pre class="prettyprint" xml:space="preserve">UpdatePerformanceBenchmark.cs: RunRamDiskTest
private void RunRamDiskTest()
{
System.Console.WriteLine("Update test: RAM disk");
int objectsToUpdate = 90;
InitForRamDriveTest();
Clean();
Open(ConfigureDriveTest());
Store();
System.Console.WriteLine("Updating " + objectsToUpdate
+ " objects on a RAM drive:");
UpdateItems(objectsToUpdate);
Close();
}</pre>
<pre class="prettyprint" xml:space="preserve">UpdatePerformanceBenchmark.cs: InitForRamDriveTest
private void InitForRamDriveTest()
{
_count = 30000;
_depth = 1;
_filePath = "r:\\performance.db4o";
_isClientServer = false;
}</pre>
<pre class="prettyprint" xml:space="preserve">UpdatePerformanceBenchmark.cs: ConfigureDriveTest
private IConfiguration ConfigureDriveTest()
{
IConfiguration config = Db4oFactory.NewConfiguration();
config.FlushFileBuffers(true);
return config;
}</pre>
</p>
<p MadCap:conditions="Global.Primary:net" />
<p>The results:</p>
<p><i>Update test: hard drive</i>
</p>
<p><i>Store 30000 objects: 2884ms</i>
</p>
<p><i>Updating 90
objects on a hard drive:</i>
</p>
<p><i>Updated 90 items: 250ms</i>
</p>
<p><i>Update test: RAM disk</i>
</p>
<p><i>Store 30000 objects: 1910ms</i>
</p>
<p><i>Updating 90
objects on a RAM drive:</i>
</p>
<p><i>Updated 90
items: 105ms</i>
</p>
<p><i>The test shows
that the faster media (RAMDISK) shows better performance on update.</i>
</p>
<p MadCap:conditions="Primary.Online">Download example code:</p>
<p MadCap:conditions="Primary.Online">
<MadCap:conditionalText MadCap:conditions="Primary..NET,Primary.c#,Primary.All languages"><a href="updateperformancecs.zip">c# </a>
</MadCap:conditionalText>
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