CPU Timer abbreviation meanings

usercfd · March 2022

hello,

Want to know what are the abbreviations in the beginning of the summary of timers as erported in the Run.out as shown below?

For example this is generated by running the multiphase dam break simulation. Which timer shows the compute time for the nearest neighbor search for the fluid and air phase?

Does dualSphysics use two solvers one for fluid and another one for air?

[CPU Timers]

VA-Init..........................: 0.028072 sec.

NL-Limits........................: 73.264526 sec.

NL-MakeSort......................: 269.665436 sec.

NL-SortData......................: 396.099945 sec.

NL-OutCheck......................: 0.036453 sec.

CF-PreForces.....................: 1903.131592 sec.

CF-Forces........................: 1327.564209 sec.

SU-Shifting......................: 708.186462 sec.

SU-ComputeStep...................: 1974.624268 sec.

SU-Floating......................: 0.000000 sec.

SU-Motion........................: 0.000000 sec.

SU-Periodic......................: 0.000000 sec.

SU-ResizeNp......................: 0.000000 sec.

SU-SavePart......................: 7.051405 sec.

Alex · March 2022

You can find the governing equations of the solvers here: https://github.com/DualSPHysics/DualSPHysics/wiki/3.-SPH-formulation

About times of Neighbour List, you will have to some the times of "NL"

Regards

usercfd · March 2022

Thanks. Seems the github has the explanation of equations but may be not exactly listing out the abbreviations such as SU, CF etc. You have explained what the NL means.

For the SU-ComputeStep (1974.6 sec) , is it the total time taken by the time marching by verlet or simplectic scheme only? and the other cpu times which were listed before that in the CPU timer summary is not adding to that SU-ComputeStep; is that correct?

By the way, does multiphase liqGas dualSphysics use two solvers one for denser fluid and another one for lighter fluid? and two kernel functions deploy separate neighborhood search and collects only the corresponding phase particles in those searches?

usercfd · March 2022

Asalih3d · March 2022

https://forums.dual.sphysics.org/discussion/comment/4998#Comment_4998

I don't recall VA, but SU = System Update, CF = Compute Forces

Kind regards

Alex · March 2022

https://github.com/DualSPHysics/DualSPHysics/wiki/4.-CPU-and-GPU-implementation

Alex · March 2022

https://camo.githubusercontent.com/83d06ae821d065e892a2b35fc81e673992ac05cf6858f6cbdecc23b44dcad66c/68747470733a2f2f692e696d6775722e636f6d2f48734e516d42462e706e67

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CPU Timer abbreviation meanings

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