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CHAPTER 12: Monitoring, Analysis, and Performance Tools
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Having made that change, Build and Run. Once the program is running (but before you click the button) start up Shark. You will see the initial interface window (see Figure 12 12).
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Figure 12 12. Initial interface for Shark
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You can choose from a variety of analysis types, ranging from Time Profile for the current application through to an entire System Trace. Leave the selection as Time Profile. Similarly, you can choose to analyze a process or a file or everything (which seems a little draconian to me, and I can t envision when you would choose it!). Leave this popup as Process. If the currently selected process is not Fibonacci Fun then use the final popup to select it. Then click the Start button or press Esc (this both starts and stops the analysis). Shark makes a little popping noise when it starts or stops analyzing. As soon as it has started, move to Fibonacci Fun and hit the Run calculation button. You will see the message Sampling... in the Shark window as it does its work. Once the calculation window is populated, you can quit Fibonacci Fun, then click on Stop (or press Esc) in the Shark window. Shark does a brief analysis then shows the Time Profile results window (see Figure 12 13). The most obvious information in this window is that over 90% of the processing time in Fibonacci Fun is spent on handling text data. Open the disclosure arrow for the highest percentage entry (at the top). You can trace the symbols right back up to the start of the program (see Figure 12 14):
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CHAPTER 12: Monitoring, Analysis, and Performance Tools
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Figure 12 13. Time Profile view of Fibonacci Fun in Shark
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Figure 12 14. Expanding the symbol track for Fibonacci Fun
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CHAPTER 12: Monitoring, Analysis, and Performance Tools
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You will see that the highest numbers are from NSNewStringByAppendingStrings onward. Again, this is probably not surprising, since the size of the string being handled is steadily increasing during each trip around the inner loop. You can get some more information out of this analysis. If you double-click on the line in the report for the startCalculation: method it opens a new window enabling you to analyze this method. To get the best from this window, you need to turn on the Advanced Settings option (under the Window menu in Shark) and choose the Show Total Column checkbox (it s surprising that this isn t on by default). Once enabled, this option shows you a line-by-line view of the method with a color-coded performance analysis. If appropriate, you will also see comments and code-tuning advice in the columns to the right. (See Figure 12 15.)
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Figure 12 15. More detailed information on the performance breakdown
Shark also provides a chart interface that shows the same information graphically. You can zoom in the chart to see each sample. (See Figure 12 16.)
CHAPTER 12: Monitoring, Analysis, and Performance Tools
Figure 12 16. Shark Time Profile for Fibonacci Fun
There is a lot more to Shark (the Developer Documentation for it is over 300 pages!) but in my view the average software developer is only rarely going to make use of it. Time spent learning Instruments thoroughly will be more rewarding, especially as some of Shark s functionality is also available in Instruments (take a look at the Time Profile instrument).
BigTop
Unix veterans will instantly recognize BigTop as a graphical version of top. top is a command-line utility that gives you a regularly updated summary of the processes running on your computer. To run it, just type top at the command prompt, and to stop it press Control+C (see Figure 12 17):
CHAPTER 12: Monitoring, Analysis, and Performance Tools
Figure 12 17. The top utility running in the Terminal
The key thing about top is that it lives in the moment. It will tell you how things are now each current process is a row, and each parameter measured is a column but not how things change over a period of time. That s where BigTop scores. You can find BigTop in /Development/Utilities. Start it up and you will see a window like Figure 12 18.
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