In this article the author modifies an industry standard middle-tier application server benchmark called Nile. The goal was to get it to build and run correctly on the 64-bit edition of the Microsoft .NET Advanced Server running on computers with Intel Itanium processors and still build as a 32-bit version to run on Pentium class x86 processors. While modifying Nile, the author discovered some of the tips he presents here. As the article explains, when modifying code for 64-bit Windows, data types are the key to success. The article discusses which types to use and when, along with new data types and the importance of memory alignment.
MSDN Magazine November 2001
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