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    <p>The easiest option is to use <code>Async.StartChild</code>. This primitve starts an asynchronous operation in background (in a thread pool) and returns a "token" that can be used to wait for a completion of the operation. This doesn't block the workflow, so you can then continue running other operations:</p> <pre><code>let productOfIncrements x y = async { // Start the 'incr x' operation in background let! x1Op = async {return incr x} |&gt; Async.StartChild // Continue doing other work // (synchronously since it takes the same time as the above.) let y1 = incr y // Now wait for the result of 'incr x' (if it is still running) let! x1 = x1Op // return the product (just call the function synchronously) return product x1 y1 } </code></pre> <p>If the two operations return the same type, then you can also use <code>Async.Parallel</code>, which composes multiple operations to run in parallel.</p> <p>If you're working with purely CPU-bound computations and you need to create a large number of them, then you can also use .NET <code>Tasks</code> directly (see for example <a href="http://tomasp.net/blog/fsharp-parallel-plinq.aspx" rel="nofollow">this article</a>). Tasks are more efficient, but are not as elegant to use (and don't support asynchronous waiting nicely).</p> <p>As a side-note, the term <em>pipeline</em> is usually used (at least in F# or .NET world) for a more complicated thing - For example, say you have a series of steps that depend on each other. When processing multiple inputs, you can run the steps in parallel (and still limit the total paralellism). This can be done using F# async workflows too - see <a href="http://tomasp.net/blog/parallel-extra-image-pipeline.aspx" rel="nofollow">for example this article</a>. There is also a <a href="https://github.com/7sharp9/pipelets" rel="nofollow">framework named pipelets</a> that implements the concept.</p>
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    1. POIs there a way to get async workflows in F# to pipeline automatically?
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    1. USTomas Petricek
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    1. POIs there a way to get async workflows in F# to pipeline automatically?
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    1. COActually what's the correct way given the definition of incr to use it in an async -- the compiler is giving me a "cannot convert int to Async<'a>".
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    2. COJust wrap in an async {return ..} like this: "let! y1 = async {return incr y}"? Is it idiomatic to have asyncs within asyncs like that?
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    3. COHas it been demonstrated that Tasks are more efficient than async workflows? And in which respect, are we talking something comparable to iterating over an array with a for loop vs foreach or something more significant?
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      1. USDavid Grenier
 

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