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what is Execution(/CPU) time when running parallel jobs? |
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May 4, 2016, 15:41 |
what is Execution(/CPU) time when running parallel jobs?
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New Member
Malthe V. Eisum
Join Date: Nov 2015
Location: Nibe, Denmark
Posts: 5
Rep Power: 10 |
I'm doing DNS simulations of a turbulent wave boundary layer, using a slightly modified version of pimpleFOAM (a body force is added to drive the flow).
To estimate the optimal number of processors I want to do a small study of the execution time with increasing no. of processors. I have therefore two questions: 1) The listed execution time is the accumulative time eg. from code example: Code:
ExecutionTime = 1.31 s Code:
1.31-1.24=0.07 s 2) Is the listed execution time an estimate for one processor or a sum of all eg. (for 8 processors) the sum of CPU time is eather Code:
1.31*8 Code:
1.31/8 Code:
Starting time loop Courant Number mean: 0 max: 0 velocity magnitude: 0 deltaT = 0.00107403 Time = 0.00107403 dU0dt = dU0dt [0 1 -2 0 0 0 0] (3.51258e-06 0 0) DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.0074636, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0 GAMG: Solving for p, Initial residual = 3.27377e-09, Final residual = 3.27377e-09, No Iterations 0 time step continuity errors : sum local = 1.65251e-28, global = 3.78285e-29, cumulative = 3.78285e-29 GAMG: Solving for p, Initial residual = 3.15544e-09, Final residual = 3.15544e-09, No Iterations 0 time step continuity errors : sum local = 1.59278e-28, global = 4.38014e-29, cumulative = 8.16298e-29 dU0dt = dU0dt [0 1 -2 0 0 0 0] (3.51258e-06 0 0) DILUPBiCG: Solving for Ux, Initial residual = 0.086718, Final residual = 1.17036e-10, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 7.4425e-11, Final residual = 7.4425e-11, No Iterations 0 GAMG: Solving for p, Initial residual = 3.48381e-09, Final residual = 3.48381e-09, No Iterations 0 time step continuity errors : sum local = 1.75853e-28, global = 4.38014e-29, cumulative = 1.25431e-28 GAMG: Solving for p, Initial residual = 3.59952e-09, Final residual = 3.59952e-09, No Iterations 0 time step continuity errors : sum local = 1.81694e-28, global = 5.37562e-29, cumulative = 1.79187e-28 ExecutionTime = 1.24 s ClockTime = 1 s Courant Number mean: 2.75088e-29 max: 8.27559e-12 velocity magnitude: 4.59998e-10 deltaT = 0.0012803 Time = 0.00235434 dU0dt = dU0dt [0 1 -2 0 0 0 0] (3.52066e-06 0 0) DILUPBiCG: Solving for Ux, Initial residual = 0.999568, Final residual = 0.00876511, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 9.62229e-11, Final residual = 9.62229e-11, No Iterations 0 GAMG: Solving for p, Initial residual = 2.84384e-08, Final residual = 2.84384e-08, No Iterations 0 time step continuity errors : sum local = 1.71118e-27, global = 1.55691e-27, cumulative = 1.7361e-27 GAMG: Solving for p, Initial residual = 3.60149e-08, Final residual = 3.60149e-08, No Iterations 0 time step continuity errors : sum local = 2.16706e-27, global = 1.8607e-27, cumulative = 3.5968e-27 dU0dt = dU0dt [0 1 -2 0 0 0 0] (3.52066e-06 0 0) DILUPBiCG: Solving for Ux, Initial residual = 0.0487339, Final residual = 1.07318e-10, No Iterations 2 DILUPBiCG: Solving for Uy, Initial residual = 1.39588e-10, Final residual = 1.39588e-10, No Iterations 0 GAMG: Solving for p, Initial residual = 3.72728e-08, Final residual = 3.72728e-08, No Iterations 0 time step continuity errors : sum local = 2.24275e-27, global = 1.8607e-27, cumulative = 5.4575e-27 GAMG: Solving for p, Initial residual = 3.09594e-08, Final residual = 3.09594e-08, No Iterations 0 time step continuity errors : sum local = 1.86287e-27, global = 1.70881e-27, cumulative = 7.16631e-27 ExecutionTime = 1.31 s ClockTime = 1 s
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Malthe Eisum |
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cpu time, parallel code |
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