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POAvailability of 32-bit .NET on a 64-bit OS
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  1. POAvailability of 32-bit .NET on a 64-bit OS
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    copied!<p><strong>TLDR:</strong> When installing .NET on a 64-bit OS, are the 32-bit components always present?</p> <p>I used to have my app (<a href="http://ironscheme.codeplex.com/">IronScheme</a>) compiled entirely as <code>AnyCPU</code>. While this works great for all platforms, the 64-bit JIT compiler just seems too slow for my liking (about 550% slower startup and about 25% slower in general). The startup slowness can be solved by NGEN'ng my assemblies and does in fact improve startup time another odd 500% when done so. This is gives about a 2600% improvement on startup time (3700ms vs 140ms) on 64-bit. When both 32-bit and 64-bit are NGEN'd, the startup times are the same, but 32-bit still performs better at runtime.</p> <p>Now given in most cases 64-bit is not needed at all, I think targeting x86 in the executable would just be the best general solution (all the other assemblies are targeting <code>AnyCPU</code>, but from what I can see, the executable determines where it goes). So the idea is to to have 2 startup executables, one targeting x86, the other x64 (or amd64 as MS calls it).</p> <p>When installing on a 32-bit OS, I can be sure no 64-bit components are present. But what about the opposite case? Does the .NET installer install both 32-bit and 64-bit components? This is important as NGEN'ng a non-AnyCPU assembly will fail if the target does not match the runtime.</p> <p>Example: </p> <p><em>"Error compiling IronScheme.Console.exe: This version of is not compatible with the version of Windows you're running."</em></p> <p>Also note that my application is built by default for .NET 2 and in VS2008, so the new <code>AnyCPU (32-bit preferred)</code> option (in VS2012/.NET 4.5) is not an option for me at this time.</p> <p>PS: Sorry, if this has been asked before. I have no idea how to search for this specific issue, and my Google fu failed me too.</p>
 

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