Line data    Source code

       1             : //------------------------------------------------------------------------------
       2             : // LAGraph/src/test/test_WallClockTime.c:  test LAGraph_WallClockTime
       3             : //------------------------------------------------------------------------------
       4             : 
       5             : // LAGraph, (c) 2019-2022 by The LAGraph Contributors, All Rights Reserved.
       6             : // SPDX-License-Identifier: BSD-2-Clause
       7             : //
       8             : // For additional details (including references to third party source code and
       9             : // other files) see the LICENSE file or contact permission@sei.cmu.edu. See
      10             : // Contributors.txt for a full list of contributors. Created, in part, with
      11             : // funding and support from the U.S. Government (see Acknowledgments.txt file).
      12             : // DM22-0790
      13             : 
      14             : // Contributed by Timothy A. Davis, Texas A&M University
      15             : 
      16             : //------------------------------------------------------------------------------
      17             : 
      18             : #include "LAGraph_test.h"
      19             : 
      20             : //------------------------------------------------------------------------------
      21             : // global variables
      22             : //------------------------------------------------------------------------------
      23             : 
      24             : double t ;
      25             : char msg [LAGRAPH_MSG_LEN] ;
      26             : 
      27             : //------------------------------------------------------------------------------
      28             : // test_WallClockTime:  test LAGraph_WallClockTime
      29             : //------------------------------------------------------------------------------
      30             : 
      31           1 : void test_WallClockTime (void)
      32             : {
      33             : 
      34           1 :     OK (LAGraph_Init (msg)) ;
      35             : 
      36             :     // start the timer
      37           1 :     double t = LAGraph_WallClockTime ( ) ;
      38             : 
      39             :     // do some useless work
      40           1 :     double x = msg [0] ;
      41       10001 :     for (int64_t k = 0 ; k < 10000 ; k++)
      42             :     {
      43   100010000 :         for (int64_t i = 0 ; i < 10000 ; i++)
      44             :         {
      45   100000000 :             x = x + 1 ;
      46   100000000 :             if (x > 100) x = x/2 ;
      47             :         }
      48             :     }
      49             : 
      50             :     // stop the timer
      51           1 :     t = LAGraph_WallClockTime ( ) - t ;
      52             : 
      53             :     // print the result so the compiler doesn't remove the loops above
      54           1 :     printf ("\nresult: %g, time: %g sec\n", x, t) ;
      55             : 
      56           1 :     OK (LAGraph_Finalize (msg)) ;
      57           1 : }
      58             : 
      59             : //-----------------------------------------------------------------------------
      60             : // TEST_LIST: the list of tasks for this entire test
      61             : //-----------------------------------------------------------------------------
      62             : 
      63             : TEST_LIST =
      64             : {
      65             :     { "WallClockTime", test_WallClockTime },
      66             :     // no brutal test needed
      67             :     { NULL, NULL }
      68             : } ;