progress bar code in vb net 2010 12: Monitoring, Analysis, and Performance Tools in Objective-C

Painting DataMatrix in Objective-C 12: Monitoring, Analysis, and Performance Tools

CHAPTER 12: Monitoring, Analysis, and Performance Tools
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Figure 12 6. The Leaked Objects Block View
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Luckily, there is a more useful view. At the bottom of the window, click on the Call Tree View button (second from left). Open up the call tree all the way down see Figure 12 7.
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Figure 12 7. The Call Tree View
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Here you can track through the application events: the purple- and pink-labeled entries show where the leak has been detected (the figure shows only black and white, but you will see the colors on your display). So what do you know now First, the leak is something to do with a string. Second, things start to go awry near a statement containing initWithFormat. So let s take a look back at the code to see what is occurring there. There is only one occurrence of initWithFormat, and that is in the code shown in Listing 12 3:
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Listing 12 3. Tracking Down the Source of the Leak Where Are We Using initWithFormat for (int i=2; i < 90; i++) { fibValues[i] = fibValues[i-2] + fibValues[i-1]; NSString *thisFibString; thisFibString = [[NSString alloc] initWithFormat:@"%lli, ",fibValues[i]]; outputString = [outputString stringByAppendingFormat:@"%@", thisFibString]; }
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CHAPTER 12: Monitoring, Analysis, and Performance Tools
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Is there a problem with thisFibString Well, no. It s being created and populated quite correctly. Each time around the loop you are creating a new instance of thisFibString. OK... the problem is becoming clearer. You are creating these instances but never disposing of them. In Objective-C, good memory management involves keeping track of your objects and making sure that you get rid of them using the release command when they are no longer needed. But this function uses an NSAutoreleasePool shouldn t that take care of releasing objects It turns out that objects that are created using init are not managed by the autorelease pool. So you do have to explicitly release the memory for such objects. There are two things you could do about this. First, you could create the thisFibString object differently, without using initWithFormat. Second, you could explicitly release the object s memory. Let s take the second option. Modify the code so that it looks like Listing 12 4:
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Listing 12 4. Releasing the thisFibString Object -(IBAction)startCalculation:(id)sender { NSAutoreleasePool *fibPool = [[NSAutoreleasePool alloc] init]; NSString *outputString; outputString = @"1: "; for (int x=1; x < 11; x++) { long long int fibValues[90]; fibValues[0] = 0; fibValues[1] = 1; for (int i=2; i < 90; i++) { fibValues[i] = fibValues[i-2] + fibValues[i-1]; NSString *thisFibString; thisFibString = [[NSString alloc] initWithFormat:@"%lli, ",fibValues[i]]; outputString = [outputString stringByAppendingFormat:@"%@", thisFibString]; // we're done with thisFibString now, so release [thisFibString release]; } outputString = [outputString stringByAppendingFormat:@"\n\n%i: ", x+1]; [outputField setStringValue:outputString]; } [fibPool drain]; }
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Tracking File Activity
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For the second example of monitoring using Instruments, open up the Text Pal application from 3. This is a Document-based application that can read and write files. With the project open, choose Run Run with Performance Tool File Activity. You will see the Instruments window along with the Text Pal program document window (you may also see a password dialog to authorize Instruments to use admin privileges for some instruments). Add some text to the document, save it, close it, read it in again, modify it,
CHAPTER 12: Monitoring, Analysis, and Performance Tools
and save again. Once you have done this, click on the Record button in the Instruments timeline. Text Pal will close and leave you the Instruments window, which will look like Figure 12 8.
Figure 12 8. Looking at Text Pal with the File Activity instrument
There is a wealth of information here, but let s just focus on a couple of items. Click on the Directory I/O instrument. First, as with many of the instruments, events are timestamped, so you can get a good idea of the progress of your program. The second item to look at here provides an interesting insight into the process of saving a file. Take a closer look at the three lines highlighted in the figure: Event: 13 Caller: +[NSFileWrapper(NSInternal) _temporaryDirectoryURLForWritingToURL:error:] Function: mkdir Path: /private/var/folders/QW/QWESFte3FhWdBYEpGcMlAU+++TI/TemporaryIt ems/(A Document Being Saved By Text Pal) Event: 14 Caller: -[NSFilesystemItemMoveOperation main]
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