memtest.htm

来自「WDM驱动范例程序」· HTM 代码 · 共 49 行

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49 行
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<title>The MEMTEST Sample</title>

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<h2>The MEMTEST Sample</h2>

<p>The MEMTEST Sample accompanies Chapter 3 and determines how much memory

can be allocated from the paged and nonpaged pools. </p>



<p>The sample includes two components:</p>

<ul>

<li>MEMTEST.SYS (SYS subdirectory) is a WDM driver for a non-existent device.</li>

<li >TEST.EXE (TEST subdirectory) is a Win32 console application that tests the MEMTEST driver.</li>

</ul>



<h3>Building MEMTEST</h3>

<p>To build MEMTEST.SYS, follow the <a href="..\..\wdmbook.htm#wdmbuild">general

instructions for building a WDM sample</a>. The Microsoft Visual C++ project

file is named MEMTEST.DSP in the SYS subdirectory. 



<p>To build TEST.EXE, follow <a href="..\..\wdmbook.htm#usermodebuild">the

general instructions for building user-mode programs</a>. The Microsoft Visual

C++ project file is named TEST.DSP in the TEST subdirectory.</p>



<h3>Testing MEMTEST</h3>



<p>First arrange a way to see debug messages. You can run under control of a

kernel debugger such as Soft-Ice, or you can run Mark Russinovitch抯 DbgView

utility (see <a href="http://www.sysinternals.com/">http://www.sysinternals.com</a>).</p>



<p>Now install MEMTEST.SYS. Follow the instructions for using <a

href="..\..\wdmbook.htm#FASTINST">FASTINST</a> in either Windows XP or

Windows 98/Me. The INF file is named SYS\MEMTEST.inf.</p>



<p>Finally, open a DOS prompt and navigate to the TEST\DEBUG subdirectory.

Issue the "TEST" command, which will use a DeviceIoControl to perform the test.

MEMTEST.SYS will use a binary search to determine the largest single block it can

allocate of paged and nonpaged memory, respectively, and will report the results

in the debug trace output.</p>



<h3>What to look for</h3>

<p><b>DoMemoryTest</b> in <b>Control.cpp</b> is the function that actually attempts the memory

allocations reported by the test program.</p>



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