KernProf Sample Output


Symbols loaded: 80400000  ntoskrnl.exe
^               ^         ^- module name
|               +- Base address
+- symbols loaded line (-v)
delaying for 240 seconds... report on values with 100 hits
             ^                                     ^- hit threshold (-t, defaults to 100)
             +- wait time (passed on command line, default is wait for ctrl-C)
end of delay

Processor 0: 240322 Total hits
Processor 1: 238755 Total hits
             ^- number of perf hits registered on each processor (-p)
479077 Total hits
^- total number of perf hits

PROCESSOR 0
^- indicates the following is perf data collected from processor 0 (-p)
   201101 83.68         ntoskrnl.exe --Total Hits-- 
   ^      ^             ^- module name
   |      +- percentage of hits (module hits / total hits) (-n)
   +- number of hits in this module
      115  0.05    54         ntoskrnl.exe ExAcquireResourceExclusiveLite 0x080411ADC 210 4
      ^    ^       ^          ^            ^                              ^           ^   ^- size of bucket (-a)
      |    |       |          |            |                              |           +- code size of function (-a)
      |    |       |          |            |                              +- address of function (-a)
      |    |       |          |            +- Function name (or address if no symbols loaded)
      |    |       |          +- module location
      |    |       +- hit density (hits * 100 / function length) (-d)
      |    +- percentage of hits (-n)
      +- number of hits
0x00000004:    23    45     1     0    20     7    13     0     0     0     0     0     6
^              ^-----^------^-----^----^------^----^------^-----^-----^-----^-----^-----^- hits per bucket (-c)
+- offset into function (-c)


Context Switch Information
    Find any processor             0
    Find last processor            0
    Idle any processor             0
    Idle current processor         0
    Idle last processor            0
    Preempt any processor          0
    Preempt current processor      0
    Preempt last processor         0
    Switch to idle                 0

    Total context switches    139773
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- context switch information (-x)

Sample Output Notes

If -p is specified, module profile information is printed for each processor, otherwise only one report is printed.
"size of bucket" (-a) indicates how many bytes each bucket represents. Each bucket contains 2 "bucket size" bytes. For instance if the bucket size is 4, each bucket represents 24, or 16 bytes.
Specific context switch information may be available only in checked builds.
If symbols aren't available for a component, "Function name" is replaced by the function address.
When outputting data, the profiler skips leading 0 counts, the first number represented is not necessarily the first bucket of the function.
Bucket output occasionally exceeds function size. It is believed that this is due to empty space (data or code) after the function.
if a module recieves less than "hit threshold" (specified by -t lowthreshold) hits, then its data is not displayed.