sampling

smonitor(3C)															      smonitor(3C)

NAME

       smonitor() - prepare execution profile

SYNOPSIS

DESCRIPTION

       is an interface to sprofil(2) for collecting sampling information for execution profiles.

       To use link in the library by specifying on the linker command line or on the compiler command line.  See gprof(1).

       For  any  application  compiled with the option, the library collects profiling sampling information.  But if an application requires finer
       control over profiling, the library yields control to an application that uses

       To stop the collection of sampling information, use:

       Use gprof(1) to examine the results.

Parameters
       is an array of structures describing the regions to be profiled.  It is defined in header The structure has the following fields:

       The fields are as follows:

	      is the start address of the text segment of the load module.

	      is the end address of the text segment of the load module.

	      is the name of the load module (not the path name).  The name of the load module should be the same as recorded in the executable by

       is the number of elements in the array regions.

       is the starting address a buffer to collect sampling information.

       is the length of is the only memory region used by to collect profiling information, so it should be big enough for all specified  regions.
       does  not initialize With more than one call to in the same process, dumps the sampling information collected with the last call.  does not
       discard the information collected in previous calls if it is present in the buffer passed to last call of

       is unused and kept for future usage.

       is used to choose 16-bit or 32-bit buckets to collect sampling information.  If is set to treats the buffer as an array of 16-bit  buckets;
       if set to treats the buffer as an array of 32-bit buckets.  For more information refer to sprofil(2).

EXTERNAL INFLUENCES

   Environment Variables
       The behavior of is controlled by the environment variable.  See gprof(1).  behaves with different settings of as follows:

       does not set up the buffers to collect sampling information.
	      It is expected that will be called explicitly to collect the sampling information.  So it is the ideal case to call the explicitly.

       sets up the sampling buffer for all the load modules and starts
	      to  collect the sampling information.  Now if is invoked explicitly, is stopped, the buffer allocated by is deallocated, and all the
	      sampling information collected prior to calling is lost.	uses the buffer passed as an argument and starts again.

       sets up the sampling buffer for the load modules
	      ldm1 and ldm2 and starts to collect the sampling information.  Now if is invoked explicitly, is stopped, the buffer allocated by	is
	      deallocated,  and all the sampling information collected prior to calling is lost.  uses the buffer passed as an argument and starts
	      again.

       If is not set, behaves as though

FILES

SEE ALSO

       cc(1), gprof(1), sprofil(2).

																      smonitor(3C)