openmp - run 2 different functions simultaneously C++ Open MP -

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i want run 2 absolutely different functions simultaneously. tried check if works:

#pragma omp parallel {     #pragma omp single nowait     {     #pragma omp task     {         (unsigned long long i=0; i<numsteps; i++)             sum1 = sum1 + 4.0/(1.+ (i + .5)*step*(i + .5)*step);     }     #pragma omp task     {         (unsigned long long i=0; i<numsteps; i++)             sum2 = sum2 + 4.0/(1.+ (i + .5)*step*(i + .5)*step);     }     #pragma omp taskwait     } }

with 1 cycle ends in 10s , loads cpu on 100%.

with 2 cycles want run simultaneously on 2 different cores ends in 24s , loads cpu on 200% expected near 10s.

without #pragma omp single nowait ends calculations in 138s , loads cpu on 400%.

what doing wrong?


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