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This shows a huge performance increase over the unoptimized code. What the profiler doesn t tell you directly is when the program is taking the wrong approach to solve a problem. The bubble-sort system doesn t scale and isn t the fastest way to sort a medium-sized list, but it does work well for smaller lists. Instead of investing effort in making the code go faster, the smarter approach is to consider replacing poorly performing sections with code implemented to best handle the expected use cases.

Note Before you accept the agreement, it is a good idea to read it and make sure you are comfortable with

for event in pygame.event.get(): if event.type == QUIT: exit() if event.type == MOUSEMOTION: points.append(event.pos) if len(points)>100: del points[0] screen.fill((255, 255, 255)) if len(points)>1: pygame.draw.lines(screen, (0,255,0), False, points, 2) pygame.display.update()

The previous example shows a few output options for gprof. Table 8-1 contains a complete reference for gprof command-line parameters.

its terms. If you do not agree, however, you cannot use the Remote Access facilities of Windows Home Server.

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Don t include private functions in the output. Exclude output for a function < function >. Use this when there are functions that won t be changed. For example, some sites have source code that s been approved by a regulatory agency, and no matter how inefficient, the code will remain unchanged. Also exclude the time spent in the function from the percentage tables. The opposite of -e: only track time in < function >. Only use the time in < function > when calculating percentages. Don t print the explanatory text. If you re more experienced, you can appreciate this option. Accumulate samples. By running the program several times, it s possible to get a better picture of where time is spent. For example, a slow routine may not be called for all input values, and therefore you maybe mislead reading where to find performance problems.

You may have noticed from the previous line drawing functions that the lines have a jagged appearance. This is because a pixel can only be drawn at a coordinate on a grid, which may not lie directly underneath a line if it is not horizontal or vertical. This effect is called aliasing, something which computer scientists have put a lot of work into avoiding. Any technique that attempts to avoid or reduce aliasing is called antialiasing. Pygame can draw antialiased lines that appear significantly smoother than the lines drawn by pygame.draw.line. The function pygame.draw.aaline has the same parameters as pygame.draw.line but draws smooth lines. The downside of antialiased lines is that they are slower to draw than regular lines, but only marginally so. Use aaline whenever visual quality is important. To see the difference, replace the call to pygame.draw.line in the previous example code with the aaline version.

Most leaks are memory leaks, where a program allocates memory from the heap (or free store) and then never properly releases that memory. Thus the memory can t be reallocated until the process stops running and the operating system then frees all resources. Memory leaks are dangerous because they re latent problems that don t affect a system until it has been running for some time. When a system needs to be running for days or weeks, even a small memory leak can consume all the memory allocated to a process. The concept of leaking can be applied to any limited resource that a program reserves for use and never relinquishes. A program can just as easily leak file handles as memory. The nature of programming usually results in memory being leaked, so tools focus on that problem. All memory-leak tools tell you where the allocation occurred that wasn t released; they don t show you what you d like to find, which is where the memory wasn t released.2

Figure 11-16. You must accept the Privacy Statement and Agreement to continue. 7. Type in the domain name you would like to use in the Domain Name box, as shown in Figure 11-17. The domain name can contain a maximum of 63 characters and can consist of letters, numbers, or hyphens. The name must begin and end with a letter or a number.

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