text: /* 
   * -- High Performance Computing Linpack Benchmark (HPL)                
   *    HPL - 2.0 - September 10, 2008                          
   *    Antoine P. Petitet                                                
   *    University of Tennessee, Knoxville                                
   *    Innovative Computing Laboratory                                 
   *    (C) Copyright 2000-2008 All Rights Reserved                       
   *                                                                      
   * -- Copyright notice and Licensing terms:                             
   *                                                                      
   * Redistribution  and  use in  source and binary forms, with or without
   * modification, are  permitted provided  that the following  conditions
   * are met:                                                             
   *                                                                      
   * 1. Redistributions  of  source  code  must retain the above copyright
   * notice, this list of conditions and the following disclaimer.        
   *                                                                      
   * 2. Redistributions in binary form must reproduce  the above copyright
   * notice, this list of conditions,  and the following disclaimer in the
   * documentation and/or other materials provided with the distribution. 
   *                                                                      
   * 3. All  advertising  materials  mentioning  features  or  use of this
   * software must display the following acknowledgement:                 
   * This  product  includes  software  developed  at  the  University  of
   * Tennessee, Knoxville, Innovative Computing Laboratory.             
   *                                                                      
   * 4. The name of the  University,  the name of the  Laboratory,  or the
   * names  of  its  contributors  may  not  be used to endorse or promote
   * products  derived   from   this  software  without  specific  written
   * permission.                                                          
   *                                                                      
   * -- Disclaimer:                                                       
   *                                                                      
   * THIS  SOFTWARE  IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,  INCLUDING,  BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY
   * OR  CONTRIBUTORS  BE  LIABLE FOR ANY  DIRECT,  INDIRECT,  INCIDENTAL,
   * SPECIAL,  EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES  (INCLUDING,  BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT,  STRICT LIABILITY,  OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
   * ---------------------------------------------------------------------
   */ 
  /*
   * Include files
   */
  #include "hpl.h"
   
  /* 
   * Purpose
   * =======
   *
   * HPL_timer_walltime returns the elapsed (wall-clock) time.
   * 
   *
   * ---------------------------------------------------------------------
   */ 
  
  #if defined( HPL_USE_GETTIMEOFDAY )
  
  #include <sys/time.h>
  #include <sys/resource.h>
  
  #ifdef HPL_STDC_HEADERS
  double HPL_timer_walltime( void )
  #else
  double HPL_timer_walltime()
  #endif
  {
     struct timeval             tp;
     static long                start=0, startu;
  
     if( !start )
     {
        (void) gettimeofday( &tp, NULL );
        start  = tp.tv_sec;
        startu = tp.tv_usec;
        return( HPL_rzero );
     }
     (void) gettimeofday( &tp, NULL );
  
     return( (double)( tp.tv_sec - start ) +
             ( (double)( tp.tv_usec-startu ) / 1000000.0 ) );
  }
  
  #else
  
  #ifdef HPL_STDC_HEADERS
  double HPL_timer_walltime( void )
  #else
  double HPL_timer_walltime()
  #endif
  {
     return( MPI_Wtime() );
  }
   
  #endif
  /*
   * End of HPL_timer_walltime
   */
  