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I/O versus pure computational work This can encompass reading from and writing to files on disk, making Web service invocations, doing raw network socket communication, and so on For anybody wanting to use parallelism to speed things up, this can pose some unique challenges There's one disk on most client machines, after all, so if most of the time is spent waiting for it, how are we to speed things up If we parallelize across 1 6 cores, and yet all of those threads just spend most of their time access ing a single disk, I / O will be a bottleneck limiting our speedup I/O is interesting (and challenging) for another reason: I/O operations, much like synchronization waits, block the thread of execution Just as hav ing many threads doing nothing but waiting for a single hot lock is a bad idea, having lots of threads doing I/O simultaneously against a single resource is also usually a bad idea It can result in context switching, caches becoming cold, and a variety of other secondary performance effects 1 / 0 often also causes responsiveness issues in GUI programs This is especially true when very long latencies are involved, like accessing network resources, causing the notorious Not Responding message to be placed into an appli cation's title bar A related problem is that when a runaway I/O has been made, it can be difficult to cancel its effects when they are no longer desired (eg, when a user has clicked a Cancel button in the application's GUI)

10

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We explore the impact t o GUls further in the next chapter, which will build on this chapter 's content In all of these cases, the net effect is the same: in a responsive, scalable system, the ripple effect of synchronous I / O can be substantial Threads are wasted (space), and performance degrades (time) Sometimes this is just inherent in the problem; there isn't any work to do while the I/O happens In other cases, I / O is so short and the latency so predictable that synchro nous I / O is more efficient (not to mention easier to program) For many cases, however, the Windows platform's deep support for asynchronous I / O can be used to achieve better results Asynchronous I / O masks latency by eschewing waiting while an asynchronous I / O is in process This chapter will review asynchronous I / O in depth These capabilities are surfaced through various asynchronous file and socket APls in addition to 1/0 completion ports, a scalable I / O completion mechanism We'll see how this works from both native and managed code We'll then look into 1/0 cancellation, which allows cancellation of runaway I / O requests This, as noted above, is particularly useful when building responsive GUls

Asynchronous I / O on Windows is generally referred to as overlapped 110 While the name is a little funny sounding, conceptually it allows you to overlap one or more I / O requests with other useful work While there are many details and a few different modes of how asynchronous I / O is used in the programming model, they all work very similarly First, you must initiate an I / O operation, much like you would an ordinary syn chronous I / O The difference is that the request returns right away so the caller can continue doing other work The OS will keep track of all out standing asynchronous I / O requests, manage them, and ensure each even tually executes by using interrupts and working directly with the I / O device driver Notice from this description that no thread is needed for the I / O as it executes This is a tremendous benefit, given the overheads that threads imply You can effectively have an unlimited number of outstanding I/Os running at any given time for a single thread