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Despite its name, the CLR Profiler is not a general-purpose profiler for the CLR. It is, in fact, a managed-memory profiler. If you see that your application has memory-related performance problems but have no idea what is causing them, then the CLR Profiler can help you get a better idea of what types of objects are taking up memory and when they get allocated.
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CHAPTER 12 I THE F# TOOL SUITE AND .NET PROGRAMMING TOOLS
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The CLR Profiler can generate several different types of graph to help you visualize how memory is being used. It can generate an allocation graph that shows which methods created which object types, a histogram of all the allocated types, histograms of objects by ages and address, and timelines of object allocation. Perhaps the most useful feature is the ability to generate a histogram of the types in use on the managed heap, as shown in Figure 12-6. This allows you to get a better idea of which types are consuming memory. With this knowledge, you can review the code and look for places where you can remove instances of types.
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Figure 12-6. A histogram generated by the CLR Profiler CLR Profiler also has a command-line mode where it logs its results to a file. This is useful because you can use it as part of an automated testing process to check that each build doesn t have any regression errors.
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I Note This tool is freely available for download from http://www.microsoft.com/downloads/
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In this chapter, you surveyed a number of development tools that help make the lives of the F# users easier. Some tools, such as fsi.exe (F# interactive), are very flexible, and you ll probably use them every time you code in F#; others you ll use less frequently to track down tricky bugs. In the next chapter, you ll look at compatibility and advanced interoperation.
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CHAPTER
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Compatibility and Advanced Interoperation
n this chapter, you will look at everything you need to make F# interoperate well with other languages, not just within the .NET Framework but also using unmanaged code from F# and using F# from unmanaged code.
I Caution Throughout this book, I have made every effort to make sure the only language you need to understand is F#. However, in this chapter, it will help if you know a little C#, C++, or .NET Common IL, although I ve kept the code in these languages to the minimum necessary.
Calling F# Libraries from C#
You can create two kinds of libraries in F#: libraries that are designed to be used from F# only and libraries that are designed to be used from any .NET language. This is because F# utilizes the .NET type system in a rich and powerful way, so some types can look a little unusual to other .NET languages; however, these types will always look like they should when viewed from F#. So, although you could use any library written in F# from any .NET language, you need to follow a few rules if you want to make the library as friendly as possible. Here is how I summarize these rules: Always use a signature .fsi file to hide implementation details and document the API expected by clients. Avoid public functions that return tuples. If you want to expose a function that takes another function as a value, expose the value as a delegate. Do not use union types in the API, but if you absolutely must use these types, add members to make them easier to use.
CHAPTER 13 I COMPATIBILITY AND ADVANCED INTEROPERATION
Avoid returning F# lists, and use the array System.Collections.Generic.IEnumerable or System.Collections.Generic.List instead. When possible, place type definitions in a namespace, and place only value definitions within a module. Be careful with the signatures you define on classes and interfaces; a small change in the syntax can make a big difference. I will illustrate these points with examples in the following sections.
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