macOS my C program runs slowly using only 10% CPU, why not more?

[iSee]

Sorry, I misled you with the name "system profiler."

I meant the utility (In Applications/Utilities) that let's you look at CPU usage by process, current memory usage, etc, etc. I got the name for this utility confused with "system profiler."

Anyone remember the real name (I'm not at my Mac now, so I can't find it).

Edit: It's called "Activity Monitor" (heh, again using my faulty memory, but I think I have it right this time).

 

[AlmostThere]

Can't you just run gprof on each platform and see in which function most of the time is spent?

(Have I miss read read something already said? I am assuming Shark is very similar but it is very simple to get some basic comparative data with gprof)

 

[nino65]

thank you, iSee, this is the output of my activity monitor while 2 instances were running

 

[nino65]

AlmostThere... you won't believe that I didn't know about gprof till 5 minutes ago

more or less it seems something like Shark (that i've already used) but I don't know if it can provide some more info about I/O...