pi calculation benchmark

http://fab.cba.mit.edu/classes/MAS.864/text/benchmark.pdf

estimated GFlops	code	description	system	date
71.46	pi.html	JavaScript, 56 workers	Intel 2x E5-2680	Nov 19, 2018
46.96	mpipi.c	C, MPI mpicc mpipi.c -o mpipi -O3 -ffast-math mpirun -np 6 mpipi	Intel i7-8700T	Nov 17, 2018
16.16	pi.html	JavaScript, 6 workers	Intel i7-8700T	Nov 17, 2018
9.371	pi.c	C gcc pi.c -o pi -lm -O3 -ffast-math	Intel i7-8700T	Nov 17, 2018
3.734	pi.html	JavaScript, 1 worker	Intel i7-8700T	Nov 17, 2018
3.472	pi.html	JavaScript, 1 worker	Intel 2x E5-2680	Nov 19, 2018
3.007	clusterpi.js	Node, 12 processes	Intel 2x E5-2680	Nov 24, 2018
0.573	pi.c	C gcc pi.c -o pi -lm	Intel i7-8700T	Nov 17, 2018
0.470	numpi.py	Python, NumPy	Intel i7-8700T	Nov 17, 2018
0.029	pi.py	Python	Intel i7-8700T	Nov 17, 2018
	tfpi.html	JavaScript, TensorFlow.js