$ mpirun -np 4 pirules Process number 0 on processor voyager.umsl.edu Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule Process number 1 on processor compute-0-0.local Process number 2 on processor compute-0-1.local Process number 3 on processor compute-0-2.local 1 Please input the number of intervals(0 quits). 10000000 pi is approximately 3.1415927535898307, Relative Error is 3.18310006e-06 wall clock time = 0.116112 Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule 2 Please input the number of intervals(0 quits). 10000000 pi is approximately 3.1415926535897607, Relative Error is -1.03191330e-12 wall clock time = 0.163527 Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule 3 Please input the number of intervals(0 quits). 10000000 pi is approximately 3.1415926535897611, Relative Error is -1.01777750e-12 wall clock time = 0.328525 Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule 3 Please input the number of intervals(0 quits). 1000 pi is approximately 3.1415926535897931, Relative Error is 0.00000000e+00 wall clock time = 0.000408 Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule 0 [siegelj@voyager solidcode]$ mpirun -np 8 pirules Process number 0 on processor voyager.umsl.edu Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule Process number 6 on processor compute-0-1.local Process number 5 on processor compute-0-0.local Process number 4 on processor compute-0-3.local Process number 7 on processor compute-0-2.local Process number 2 on processor compute-0-1.local Process number 3 on processor compute-0-2.local Process number 1 on processor compute-0-0.local 1 Please input the number of intervals(0 quits). 10000000 pi is approximately 3.1415927535897907, Relative Error is 3.18309879e-06 wall clock time = 0.115095 Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule 0 $ mpirun -np 2 pirules Process number 0 on processor voyager.umsl.edu Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule Process number 1 on processor compute-0-0.local 1 Please input the number of intervals(0 quits). 10000000 pi is approximately 3.1415927535897517, Relative Error is 3.18309754e-06 wall clock time = 0.230361 Which rule do you want to use? 0= done 1=rectangular rule 2=mid point rule 3=simpsons rule 0 $