#include "internal.h"





/****************************************************************************/
void benchmark_lfds611_freelist( void )
{
  unsigned int
    loop,
    thread_count,
    cpu_count;

  struct lfds611_freelist_state
    *fs;

  struct lfds611_freelist_benchmark
    *fb;

  thread_state_t
    *thread_handles;

  lfds611_atom_t
    total_operations_for_full_test_for_all_cpus,
    total_operations_for_full_test_for_all_cpus_for_one_cpu = 0;

  double
    mean_operations_per_second_per_cpu,
    difference_per_second_per_cpu,
    total_difference_per_second_per_cpu,
    std_dev_per_second_per_cpu,
    scalability;

  /* TRD : here we benchmark the freelist

           the benchmark is to have a single freelist
           where a worker thread busy-works popping and then pushing
  */

  cpu_count = abstraction_cpu_count();

  thread_handles = (thread_state_t *) malloc( sizeof(thread_state_t) * cpu_count );

  fb = (struct lfds611_freelist_benchmark *) malloc( sizeof(struct lfds611_freelist_benchmark) * cpu_count );

  // TRD : print the benchmark ID and CSV header
  printf( "\n"
          "Release %s Freelist Benchmark #1\n"
          "CPUs,total ops,mean ops/sec per CPU,standard deviation,scalability\n", LFDS611_RELEASE_NUMBER_STRING );

  // TRD : we run CPU count times for scalability
  for( thread_count = 1 ; thread_count <= cpu_count ; thread_count++ )
  {
    // TRD : initialisation
    lfds611_freelist_new( &fs, 1000, NULL, NULL );

    for( loop = 0 ; loop < cpu_count ; loop++ )
    {
      (fb+loop)->fs = fs;
      (fb+loop)->operation_count = 0;
    }

    // TRD : main test
    for( loop = 0 ; loop < thread_count ; loop++ )
      abstraction_thread_start( &thread_handles[loop], loop, benchmark_lfds611_freelist_thread_pop_and_push, fb+loop );

    for( loop = 0 ; loop < thread_count ; loop++ )
      abstraction_thread_wait( thread_handles[loop] );

    // TRD : post test math
    total_operations_for_full_test_for_all_cpus = 0;
    total_difference_per_second_per_cpu = 0;

    for( loop = 0 ; loop < thread_count ; loop++ )
      total_operations_for_full_test_for_all_cpus += (fb+loop)->operation_count;

    mean_operations_per_second_per_cpu = ((double) total_operations_for_full_test_for_all_cpus / (double) thread_count) / (double) 10;

    if( thread_count == 1 )
      total_operations_for_full_test_for_all_cpus_for_one_cpu = total_operations_for_full_test_for_all_cpus;

    for( loop = 0 ; loop < thread_count ; loop++ )
    {
      difference_per_second_per_cpu = ((double) (fb+loop)->operation_count / (double) 10) - mean_operations_per_second_per_cpu;
      total_difference_per_second_per_cpu += difference_per_second_per_cpu * difference_per_second_per_cpu;
    }

    std_dev_per_second_per_cpu = sqrt( (double) total_difference_per_second_per_cpu );

    scalability = (double) total_operations_for_full_test_for_all_cpus / (double) (total_operations_for_full_test_for_all_cpus_for_one_cpu * thread_count);

    printf( "%u,%u,%.0f,%.0f,%0.2f\n", thread_count, (unsigned int) total_operations_for_full_test_for_all_cpus, mean_operations_per_second_per_cpu, std_dev_per_second_per_cpu, scalability );

    // TRD : cleanup
    lfds611_freelist_delete( fs, NULL, NULL );
  }

  free( fb );

  free( thread_handles );

  return;
}





/****************************************************************************/
thread_return_t CALLING_CONVENTION benchmark_lfds611_freelist_thread_pop_and_push( void *freelist_benchmark )
{
  struct lfds611_freelist_benchmark
    *fb;

  struct lfds611_freelist_element
    *fe;

  time_t
    start_time;

  assert( freelist_benchmark != NULL );

  fb = (struct lfds611_freelist_benchmark *) freelist_benchmark;

  time( &start_time );

  while( time(NULL) < start_time + 10 )
  {
    lfds611_freelist_pop( fb->fs, &fe );
    lfds611_freelist_push( fb->fs, fe );

    fb->operation_count += 2;
  }

  return( (thread_return_t) EXIT_SUCCESS );
}