Now you will use information in the Performance Profile viewer to determine if you can improve performance in the UMTS base station code.
To locate and improve performance issues:
Select the Performance Profile tab.
Within the table, left-click the column title Function Time in order to sort the table by this column.
For this exercise you have sorted by the Function Time - that is, you're looking at functions that take the longest time, overall, to execute. This is isn't the only potential type of bottleneck in an application - for example, perhaps it is the number of times one function calls its descendants that is the problem - but for this exercise, you will look here.
As the developer of this UMTS base station, you would know that the method read_string() takes a fair amount of time to execute - so you won't look here first (although feel free to have a look if you wish). Instead look at the second function in the table.
Select the link for the method checkLog().
A quick look at the source code shows you that the developer has added an inexplicable loop - perhaps a dummy function to act as a "time-waster". Simply comment out the line.
Change the code from
for (x=1,y=100000;x<=100000;x++) y=y/x;
to
// for (x=1,y=100000;x<=100000;x++) y=y/x;
Select the menu item File->Save.
Right-click the tab for the source file you have just modified and select Close.
You have now eliminated a loop that was adding significant execution time to the checkLog() method.