different result from "top"

[zhou r. <zho...@gm...>]

the machine has 24 cores,

"top" shows MY_APPLICATION use about 40% cpu. (Irix mode on)

but from oprofile, it only use 0.8799% cpu?
why?

CPU: Intel Architectural Perfmon, speed 2666.01 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a
unit mask of 0x00 (No unit mask) count 100000
CPU_CLK_UNHALT...|
  samples|      %|
------------------
   656980 40.1202 vmlinux
   473114 28.8919 vmlinux
   298978 18.2579 MY_KERN_DRIVER
   165838 10.1273 ixgbe
    14408  0.8799 MY_APPLICATION
    10443  0.6377 libc-2.11.1.so
     8251  0.5039 processor
     4658  0.2845 oprofiled