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Thanks a lot. Actually, I am little bit confused with REAL TIME (Or WALL CLOCK TIME) vs ELAPSED TIME. Are they same, I mean WALL CLOCK TIME and ELAPSED TIME ?
– Arpssss
Commented Jun 21, 2012 at 20:00
@Arpssss I believe they are. Real / elapsed / wall clock time is how long between the start and end of the program, e.g., how long the program took to run (as would be measured by a wall clock, hence the name). This is in contrast to CPU time (user time + system time), which measures how much time the CPU spends actually executing the program, which might be less, since the CPU can sleep while the program is waiting on something, such as user input.
– Darth Android
Commented Jun 21, 2012 at 20:12
1

"the CPU can sleep while the program is waiting on something" - Actually it's the program that sleeps (i.e. the scheduler puts the process on the "sleep" or waiting-for-I/O list) while the CPU schedules another program/process or enters the idle loop. If no other process is ready to run, then the idle loop could allow the CPU to enter somekind of low power state.
– sawdust
Commented Jun 22, 2012 at 6:14
@sawdust +1 Very true. I was thinking about a simplified system which had 1 CPU and 1 process, but forgot to specify the details as such.
– Darth Android
Commented Jun 22, 2012 at 14:06

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