Under the Hood of .NET Memory Management - Simple Talk

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Chapter 3: A Little More Detail Notice how the handle is allocated using Alloc, and then Free is called once the call to the API is complete. Objects will also be pinned if you use a fixed block. unsafe static void Main() { Person p = new Person(); p.age = 25; // Pin p fixed (int* a = &p.age) { // Do something } // p unpinned } Listing 3.12: Pinning using fixed in an unsafe block. Problems with object pinning The main problem with object pinning is that it can cause SOH fragmentation. If an object is pinned during a GC then, by definition, it can't be relocated. Depending on how you use pinning, it can reduce the efficiency of compaction, leaving gaps in the heap. The best advice is to pin for a very short time and then release, to minimize compaction issues. Summary The good news is that you've made it this far, and that means you've covered a lot of fine detail about .NET memory management. We've actually got to the point where we are touching on the VMM itself, and later on in the book we will go even deeper. 78
Chapter 3: A Little More Detail In the meantime, if you want to take a deeper (but by no means definitive) look at how garbage collection works, I recommend you read through Vineet Gupta's notes on the subject. You can find them at http://www.vineetgupta.com/2007/01/notes-on-the-clr-garbage-collector/. Now that you are armed with a much deeper knowledge of memory management, the next chapter will take you through the more common pitfalls and actual problems that can occur in .NET applications. Thanks to your "under the hood" knowledge, you should have a better understanding of why these problems occur, which will naturally help you when trying to fix them. 79
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Under the Hood of .NET Memory Management - Simple Talk

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