source: src/examples/Bench.c @ 77e6fcb

#include <fstream>
#include <stdlib>
#include <threads>

#include <unistd.h>                                     // sysconf
#include <sys/times.h>                                  // times
#include <time.h>

inline unsigned long long int Time() {
    timespec ts;
    clock_gettime(
#if defined( __linux__ )
         CLOCK_THREAD_CPUTIME_ID,
#elif defined( __freebsd__ )
         CLOCK_PROF,
#elif defined( __solaris__ )
         CLOCK_HIGHRES,
#else
    #error uC++ : internal error, unsupported architecture
#endif
         &ts );
    return 1000000000LL * ts.tv_sec + ts.tv_nsec;
} // Time

//=======================================
// time struct
//=======================================

// prevent dead-code removal
struct StructDummy {
        volatile int i;
};

void ?{}(StructDummy * this) __attribute__(( noinline )) {
        this->i = 2;
}

int get_i(StructDummy * this) {
        return this->i;
}

forall( dtype T | { int get_i(T*); } )
int bidirectional( StructDummy * this ) __attribute__(( noinline )) {
        return get_i( this );
}

void BlockStructCreateDelete( int N ) {
    long long int StartTime, EndTime;

    StartTime = Time();
    for ( int i = 0; i < N; i += 1 ) {
        StructDummy dummy;
    }
    EndTime = Time();
    sout | "\t " | ( EndTime - StartTime ) / N;
}

void DynamicStructCreateDelete( int N ) {
    long long int StartTime, EndTime;

    StartTime = Time();
    for ( int i = 0; i < N; i += 1 ) {
        StructDummy *dummy = new();
        delete(dummy);
    }
    EndTime = Time();
    sout | "\t " | ( EndTime - StartTime ) / N;
}

void StructBidirectional( int N ) {
    long long int StartTime, EndTime;
    StructDummy dummy;
    volatile int rv __attribute__(( unused ));

    StartTime = Time();
    for ( int i = 0; i < N; i += 1 ) {
        rv = bidirectional( &dummy ); 
    }
    EndTime = Time();
    sout | "\t " | ( EndTime - StartTime ) / N;
}

//=======================================
// time coroutine
//=======================================

struct CoroutineDummy { coroutine c; };
DECL_COROUTINE(CoroutineDummy);
void main(CoroutineDummy * this) {}

void ?{}(CoroutineDummy * this) {
        prime(this);
}

void BlockCoroutineCreateDelete( int N ) {
    long long int StartTime, EndTime;

    StartTime = Time();
    for ( int i = 0; i < N; i += 1 ) {
        CoroutineDummy dummy;
    }
    EndTime = Time();
    sout | "\t " | ( EndTime - StartTime ) / N;
}

void DynamicCoroutineCreateDelete( int N ) {
    long long int StartTime, EndTime;

    StartTime = Time();
    for ( int i = 0; i < N; i += 1 ) {
        CoroutineDummy * dummy = new();
        delete(dummy);
    }
    EndTime = Time();
    sout | "\t " | ( EndTime - StartTime ) / N;
}

struct CoroutineResume {
    int N;
    coroutine c;
};

DECL_COROUTINE(CoroutineResume);

void ?{}(CoroutineResume* this, int N) {
      this->N = N;
        prime(this);
}

void main(CoroutineResume* this) {
        for ( int i = 1; i <= this->N; i += 1 ) {
                suspend();
        }
}

void resumer(CoroutineResume* this) {
        long long int StartTime, EndTime;

        StartTime = Time();
        for ( int i = 1; i <= this->N; i += 1 ) {
                resume(this);
        }
        EndTime = Time();
        sout | "\t " | ( EndTime - StartTime ) / this->N;
}

//=======================================
// time task
//=======================================

struct ThreadDummy { thread t; };
DECL_THREAD(ThreadDummy);
void main(ThreadDummy * this) {}

void BlockTaskCreateDelete( int N ) {
    long long int StartTime, EndTime;

    StartTime = Time();
    for ( int i = 0; i < N; i += 1 ) {
        scoped(ThreadDummy) dummy;
    }
    EndTime = Time();
    sout | "\t " | ( EndTime - StartTime ) / N;
}

void DynamicTaskCreateDelete( int N ) {
    long long int StartTime, EndTime;

    StartTime = Time();
    for ( int i = 0; i < N; i += 1 ) {
        scoped(ThreadDummy) * dummy = new();
        delete(dummy);
    }
    EndTime = Time();
    sout | "\t " | ( EndTime - StartTime ) / N;
}

struct ContextSwitch {
    int N;
    long long result;
    thread t;
};

DECL_THREAD(ContextSwitch);

void main(ContextSwitch * this) {    
        long long int StartTime, EndTime;

        StartTime = Time();
        for ( int i = 1; i <= this->N; i += 1 ) {
            yield();
        } // for
        EndTime = Time();
        this->result = ( EndTime - StartTime ) / this->N;
}

void ?{}(ContextSwitch * this, int N) {
        this->N = N;
}

void ^?{}(ContextSwitch * this) {
        sout | "\t " | this->result;
}

//=======================================
// benchmark driver
//=======================================


int main() {
        const int NoOfTimes =
#if defined( __U_DEBUG__ )                              // takes longer so run fewer iterations
        100000;
#else
        1000000;
#endif // __U_DEBUG__

        sout | "\t\tcreate\tcreate\tcall/" | endl;
        sout | "(nsecs)";
        sout | "\t\tdelete/\tdelete/\tctx" | endl;
        sout | "\t\tblock\tdynamic\tcycle" | endl;

        sout | "object\t";
        BlockStructCreateDelete( NoOfTimes );
        DynamicStructCreateDelete( NoOfTimes );
        StructBidirectional( NoOfTimes );
        sout | endl;

        sout | "coroutine";
        BlockCoroutineCreateDelete( NoOfTimes );
        DynamicCoroutineCreateDelete( NoOfTimes );
        {
                CoroutineResume resumer = { NoOfTimes };
                resumer(&resumer);
        }
        sout | endl;

        sout | "task\t";
        BlockTaskCreateDelete( NoOfTimes );
        DynamicTaskCreateDelete( NoOfTimes );
        {
                scoped(ContextSwitch) dummy = { (int)NoOfTimes };               // context switch
        }
        sout | "\t" | endl;
}