If there's a large discrepancy between your wall clock time and the sum of your user and system time, it (usually) means something else is being done. It could be that the CPU is given other programs a chance to run as well. It could be that the program is waiting for the disk. It could be it's waiting for the network.
But whatever it is, it's not something that can be determined from here, with the output of the profiler. The profiler just shows the breakdown of how it spend the allotted CPU time - it doesn't given any indication why it didn't get the CPU for 247 seconds.
If you have a real OS, like Solaris or HP-UX, you can use tools like dtrace(1) or glance, which will give you a lot of information.
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