# Very large ClockTime deviation

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 March 3, 2021, 18:05 Very large ClockTime deviation #1 New Member   NA Join Date: Oct 2015 Posts: 10 Rep Power: 8 OpenFOAM version: v1912 Solver: simpleFOAM Issue: Very large ClockTime deviation between runs Longer explanation: I am really struggling to understand why I can run the same solver a number of times and get so many different ClockTime between them. I can get on one run: Code: ```Time = 1 smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 0.0702223, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0 smoothSolver: Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0 GAMG: Solving for p, Initial residual = 1, Final residual = 0.0524647, No Iterations 5 time step continuity errors : sum local = 0.00152781, global = 6.95405e-06, cumulative = 6.95405e-06 smoothSolver: Solving for epsilon, Initial residual = 0.0515357, Final residual = 0.00306076, No Iterations 2 smoothSolver: Solving for k, Initial residual = 1, Final residual = 0.0609778, No Iterations 2 ExecutionTime = 75.81 s ClockTime = 77 s``` and then another run immediately after Code: ```Time = 1 smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 0.0702223, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0 smoothSolver: Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0 GAMG: Solving for p, Initial residual = 1, Final residual = 0.0524647, No Iterations 5 time step continuity errors : sum local = 0.00152781, global = 6.95405e-06, cumulative = 6.95405e-06 smoothSolver: Solving for epsilon, Initial residual = 0.0515357, Final residual = 0.00306076, No Iterations 2 smoothSolver: Solving for k, Initial residual = 1, Final residual = 0.0609778, No Iterations 2 ExecutionTime = 1.99 s ClockTime = 3 s``` What could be the causing this?

 Tags benchmarking, clocktime, parallel cluster, simplefoam, solver control

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