Re: Unix "time" returns 43.833s. "gprof" returns 438 seconds.

[Nick Clifton]

Hi Jason,

> Unix "time" returns 43.833s. gprof returns 438 seconds. Either I'm going
> crazy or gprof is reporting a 10x increase? What could be causing this?

A bug of some kind.  Presumably in gprof.

> user    0m43.646s

> Each sample counts as 0.01 seconds.
>   %   cumulative   self              self     total
>  time   seconds   seconds    calls   s/call   s/call  name
>  87.46    381.78   381.78      256     1.49     1.49  readMB
>  12.95    438.32    56.53      256     0.22     0.22  writeMB

Suppose that gprof had the wrong period for the sample.  Suppose for 
example that each sample counted as 0.06 seconds.  Then we can deduce 
that the actual cumulative time in seconds would be:

   438.32 * 6 = 2629.92 seconds
or
   2629.92 / 60 = 43.83 minutes

Which is pretty much what you are expecting yes ?

Cheers
  Nick