source: doc/theses/colby_parsons_MMAth/benchmarks/actors/caf/CAFExecutor.cpp

#include <iostream>
using namespace std;
#include <chrono>
using namespace chrono;

#include "caf/actor_ostream.hpp"
#include "caf/caf_main.hpp"
#include "caf/event_based_actor.hpp"
using namespace caf;

int Actors = 40'000, Set = 100, Rounds = 400, Processors = 1, Batch = 1, Factor = 40; // ' default values
time_point<steady_clock> starttime;
actor * actors;
int actorCnt = 0;

class Executor : public event_based_actor {
        static int ids;                                                                         // unique actor id generator
        actor * gstart;
        int id, rounds, group, recs = 0, sends = 0;

        behavior make_behavior() override {
                return {
                        [=]( int & ) -> void {
                                if ( recs == rounds ) {
                                        if ( __atomic_add_fetch( &actorCnt, 1, __ATOMIC_SEQ_CST ) == Actors ) {
                                                aout(this) << (steady_clock::now() - starttime).count() * Factor / 1'000'000'000.0 << endl;
                                        } // if
                                        this->quit();
                                        return;
                                } // if
                                if ( recs % Batch == 0 ) {
                                        for ( int i = 0; i < Batch; i += 1 ) {
                                                this->send( gstart[sends % Set], 0 ); // cycle through group
                                                sends += 1;
                                        }
                                }
                                //aout(this) << id << " " << cnt << endl;
                                recs += 1;
                        }
                };
        }
  public:
        Executor( caf::actor_config & cfg ) : event_based_actor( cfg ) {
                id = ids++;                                                                             // unique actor id, and start point for cycle
                gstart = &actors[id / Set * Set];                               // remember group-start array-element
                rounds = Set * Rounds;                                                  // send at least one message to each group member
                // aout(this) << "id " << id << " rounds " << rounds << " group " << group << endl;
        }
}; // Executor
int Executor::ids = 0;

void caf_main( actor_system & sys ) {
        for ( int i = 0; i < Actors; i += 1 ) {                         // create actors
                actors[i] = sys.spawn<Executor>();
        } // for
        starttime = steady_clock::now();
        for ( int i = 0; i < Actors; i += 1 ) {                         // start actors
                caf::anon_send( actors[i], 0 );
        } // for
} // caf_main

int main( int argc, char * argv[] ) {
        switch ( argc ) {
      case 7:
                if ( strcmp( argv[6], "d" ) != 0 ) {                    // default ?
                        Factor = stoi( argv[6] );
                        if ( Factor < 1 ) goto Usage;
                } // if
          case 6:
                if ( strcmp( argv[5], "d" ) != 0 ) {                    // default ?
                        Batch = stoi( argv[5] );
                        if ( Batch < 1 ) goto Usage;
                } // if
          case 5:
                if ( strcmp( argv[4], "d" ) != 0 ) {                    // default ?
                        Processors = stoi( argv[4] );
                        if ( Processors < 1 ) goto Usage;
                } // if
          case 4:
                if ( strcmp( argv[3], "d" ) != 0 ) {                    // default ?
                        Rounds = stoi( argv[3] );
                        if ( Rounds < 1 ) goto Usage;
                } // if
          case 3:
                if ( strcmp( argv[2], "d" ) != 0 ) {                    // default ?
                        Set = stoi( argv[2] );
                        if ( Set < 1 ) goto Usage;
                } // if
          case 2:
                if ( strcmp( argv[1], "d" ) != 0 ) {                    // default ?
                        Actors = stoi( argv[1] );
                        if ( Actors < 1 || Actors <= Set || Actors % Set != 0 ) goto Usage;
                } // if
          case 1:                                                                                       // use defaults
                break;
          default:
          Usage:
                cerr << "Usage: " << argv[0]
                         << " [ actors (> 0 && > set && actors % set == 0 ) | 'd' (default " << Actors
                         << ") ] [ set (> 0) | 'd' (default " << Set
                         << ") ] [ rounds (> 0) | 'd' (default " << Rounds
                         << ") ] [ processors (> 0) | 'd' (default " << Processors
                         << ") ] [ batch (> 0) | 'd' (default " << Batch
                         << ") ]" << endl;
                exit( EXIT_FAILURE );
        } // switch

    Rounds = Rounds / Factor;

        //cout << Actors << " " << Set << " " << Rounds << " " << Processors << endl;
        actors = new actor[Actors];

        caf::core::init_global_meta_objects();
        caf::exec_main_init_meta_objects<>();

        caf::actor_system_config cfg;
        cfg.set( "caf.scheduler.max-threads", Processors );
        caf::actor_system system { cfg };

        return caf::exec_main<>(caf_main, argc, argv);
} // main
//CAF_MAIN()

// /usr/bin/time -f "%Uu %Ss %Er %Mkb" a.out

// Local Variables: //
// compile-command: "g++-10 -Wall -O3 -std=c++17 -ICAF/actor-framework/libcaf_core -ICAF/actor-framework/libcaf_core/caf -ICAF/actor-framework/build/libcaf_core -LCAF/actor-framework/build/libcaf_core -LCAF/actor-framework/build/libcaf_io CAFExecutor.cpp -lcaf_io -lcaf_core -Wl,-rpath=CAF/actor-framework/build/libcaf_core" //
// End: //