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At least with the prerelease version of PLINQ that I ve played with, I ve found it very useful to set up timers to con rm that PLINQ actually can speed up an operation My record at guessing which code will bene t from running in parallel is not good, so I nd that con rming the code s effectiveness by explicitly measuring it is worthwhile You can either use the class from the namespace, as simple shown here, or you can use a pro ler Note that a thread-aware pro ler might ship with some versions of Visual Studio 2010 I ve found that the advantages of concurrent LINQ become more obvious the longer the operation I m timing lasts As a result, I ve placed the query inside a loop and added a variable to the program called NUM_ REPS By setting NUM_REPS to a large number, such as 500, you can clearly see the bene ts that can be accrued when you run LINQ queries in parallel on multiple processors Note that the rst time PLINQ is used, its assembly needs to be loaded, the relevant types need to be JIT compiled, new threads need to be spun up, and so on As a result, many developers see improved performance after they get past the initial warm-up time Although it is very easy to get started with PLINQ, you still need to consider complexities that are inherent in the subject For instance, PLINQ sometimes develops a different partitioning scheme for your data, depending on whether you are working with an enumerable or an array To learn
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more about this subject, see the following post from the Parallel Programming team: http://blogsmsdncom/pfxteam/archive/2007/12/02/6558579aspx The simple PLINQ examples shown in this section should help you get started with this powerful and interesting technology Parallel LINQ is still in its infancy, but already it provides a way to greatly simplify tasks that normally are not easy to perform
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LINQ to Flickr allows developers to write queries against the Flickr repository of images hosted by Yahoo! It also allows you to upload and delete photos from your stream and to create and remove comments I ve elected to show LINQ to Flickr in this chapter because it is reasonably well written and runs against a data resource, Flickr, that nearly all developers can access Flickr is a repository for photographs It is a public site that you can use without charge It is located at http://www ickrcom/ You can create your own free Flickr account and upload pictures to it that can be shared with the public If you have an existing Yahoo! account, you are already automatically a member of the Flickr community Flickr supports an API that allows you to write queries against photos that are hosted on the site This API forms the foundation on which LINQ to Flickr is built The documentation for the API is found here: http://www ickrcom/services/api/ You can apply for a free API key that allows you to log into Flickr and call the API: http://www ickrcom/services/api/keys/ LINQ to Flickr is a LINQ provider that wraps the API and allows you to write traditional LINQ queries against the data in the Flickr repository From a developer s point of view, LINQ to Flickr is simply another avor of LINQ, such as LINQ to SQL, LINQ to Objects, or LINQ to XML Behind the scenes it uses the Flickr API, but that fact is not at all obvious Nor do
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you need to understand the API to use LINQ to Flickr You only need to know LINQ Here is the URL for the web site from which you can download LINQ to Flickr: http://wwwcodeplexcom/LINQFlickr LINQ to Flickr (also known as Athena) is built on top of a tool called LINQExtender The DLL that encapsulates LINQExtender comes with LINQ to Flickr, but if you want your own copy of the source for LINQExtender, you can download it here: http://wwwcodeplexcom/LinqExtender
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