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readprofile



SYNOPSIS

       readprofile [ options ]


VERSION

       This manpage documents version 2.0 of the program.


DESCRIPTION

       The readprofile command uses the /proc/profile information
       to print ascii data on standard  output.   The  output  is
       organized  in  three  columns:  the first is the number of
       clock ticks, the second is the name of the C  function  in
       the  kernel where those many ticks occurred, and the third
       is the normalized `load' of the procedure, calculated as a
       ratio  between  the  number of ticks and the length of the
       procedure. The output is filled with blanks to ease  read­
       ability.

       Available command line options are the following:

       -m mapfile
              Specify    a   mapfile,   which   by   default   is
              /usr/src/linux/System.map.  You should specify  the
              map  file  on  cmdline if your current kernel isn't
              the last one you compiled. If the name of  the  map
              file ends with `.gz' it is decompressed on the fly.

       -p pro-file
              Specify a  different  profiling  buffer,  which  by
              default  is  /proc/profile.  Using a different pro-
              file is useful if you want to `freeze'  the  kernel
              profiling  at  some  time  and  read  it later. The
              /proc/profile file can be  copied  using  `cat'  or
              `cp'.  There is no more support for compressed pro­
              file buffers, like in readprofile-1.1, because  the
              program  needs  to  know  the size of the buffer in
              advance.

       -i     Info. This makes readprofile only print the profil­
              ing step used by the kernel.  The profiling step is
              the resolution of the profiling buffer, and is cho­
              sen during kernel configuration (through `make con­
              fig'), or in the kernel's command line.  If the  -t
              (terse)  switch  is  used together with -i only the
              decimal number is printed.


       -M multiplier
              On some architectures it is possible to  alter  the
              frequency  at  which  the kernel delivers profiling
              interrupts to each CPU.  This option allows you  to
              set  the  frequency,  as a multiplier of the system
              clock frequency, HZ.  This is supported on i386-SMP
              (2.2  and  2.4  kernel)  and  also on sparc-SMP and
              sparc64-SMP (2.4 kernel).  This option also  resets
              the profiling buffer, and requires superuser privi­
              leges.

       -v     Verbose. The output is organized  in  four  columns
              and  filled  with  blanks.  The first column is the
              RAM address of a kernel function, the second is the
              name  of  the  function, the third is the number of
              clock ticks and the last is the normalized load.

       -V     Version. This makes readprofile print  its  version
              number and exit.


EXAMPLES

       Browse the profiling buffer ordering by clock ticks:
          readprofile | sort -nr | less

       Print the 20 most loaded procedures:
          readprofile | sort -nr +2 | head -20

       Print only filesystem profile:
          readprofile | grep _ext2

       Look at all the kernel information, with ram addresses"
          readprofile -av | less

       Browse  a  `freezed' profile buffer for a non current ker­
       nel:
          readprofile -p ~/profile.freeze -m /zImage.map.gz

       Request profiling at 2kHz per CPU, and reset the profiling
       buffer
          sudo readprofile -M 20


BUGS

       readprofile  only  works  with  an  1.3.x or newer kernel,
       because /proc/profile changed in the step from 1.2 to 1.3

       re-enabled. Watch out for misleading information.


FILES

       /proc/profile              A binary snapshot of the profiling buffer.
       /usr/src/linux/System.map  The symbol table for the kernel.
       /usr/src/linux/*           The program being profiled :-)

                             May 1996              READPROFILE(1)
  
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