NAME

       dis_cpu_time - cumulated cpu for distributed computations (rheolef-7.2)

SYNOPSIS

       double dis_cpu_time();
       double dis_wall_time();
       double seq_cpu_time();
       double seq_wall_time();

EXAMPLE

           double t_start = dis_wall_time();
           ...stuff to be timed...
           double t_end   = dis_wall_time();
           derr << 'That took ' << t_end - t_start << ' seconds' << endl

           double cpu_start = dis_cpu_time();
           ...stuff to be timed...
           double cpu_end   = dis_cpu_time();
           derr << 'That needs ' << cpu_end - cpu_start << ' CPU seconds' << endl

        See also diststream(2) for derr.

DESCRIPTION

       dis_cpu_time

            Returns the accumulated CPU for all processed linked together via the default
           communicator.

       seq_cpu_time

            It is similar but returns the computing time per user for the current process only.

       dis_wall_time

            Returns a floating-point number of seconds, representing elapsed wall-clock time
           since some time in the past. The time in the past is guaranteed not to change during
           the life of the process. The user is responsible for converting large numbers of
           seconds to other units if they are preferred. This function is portable (it returns
           seconds, not ticks), it allows high resolution, and carries no unnecessary baggage. In
           a distributed environment, dis_wall_time clocks are synchronized: different nodes
           return the same time value at the same instant.

       seq_wall_time

            It is similar but the time returned is local to the node that called them and clocks
           are not synchronized: in a distributed environment, different nodes can return
           different local times, at different instant when the call to seq_wall_time is reached.

IMPLEMENTATION

       This documentation has been generated from file linalg/lib/dis_cpu_time.h

AUTHOR

       Pierre  Saramito  <Pierre.Saramito@imag.fr>

COPYRIGHT

       Copyright   (C)  2000-2018  Pierre  Saramito  <Pierre.Saramito@imag.fr> GPLv3+: GNU GPL
       version 3 or later  <http://gnu.org/licenses/gpl.html>.  This  is  free  software:  you
       are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by
       law.