Run-TIme Optimizations

Shabirmean · November 13, 2014, 01:58

What Optimizations can I do to reduce the runtime without effecting the correctness of the numerical values of a solved case?

Where are places I need to look into?
What should I be changing and consider making changes to?

sbaffini · November 14, 2014, 13:20

How could we answer without any detail? Programming Language, application, etc.

At this level the only obvious answer is: use a profiler, it will tell you.

Shabirmean · November 14, 2014, 13:35

I am sorry. It is a case run in OpenFOAM which is written in C.

Software used: OpenFOAM CFD

Case: I am trying to solve the Shallow Water Equations using the OpenFOAM built in solver shallowWaterFoam.

Grid size: 70 x 40 square meters.

Iv started with a fine mesh with 20 cells per meter and have reduced it to 5 cells per meter for run-time reduction. Reducing it further may affect the accuracy of the output!!!

Current Hardware: Intel Core i7-3770 ---> 3.4 Ghz x 8

Graphics: Gallium 0.4 on NVE7 Cache: 3MB

Can you suggest some best choices for profiling packages?

Thanks

November 13, 2014, 01:58	Run-TIme Optimizations	#1
Shabirmean New Member Shabir Mohamed Join Date: Jun 2014 Posts: 20 Rep Power: 12	What Optimizations can I do to reduce the runtime without effecting the correctness of the numerical values of a solved case? Where are places I need to look into? What should I be changing and consider making changes to?

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November 14, 2014, 13:20		#2
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,192 Blog Entries: 29 Rep Power: 39	How could we answer without any detail? Programming Language, application, etc. At this level the only obvious answer is: use a profiler, it will tell you.

November 14, 2014, 13:35		#3
Shabirmean New Member Shabir Mohamed Join Date: Jun 2014 Posts: 20 Rep Power: 12	I am sorry. It is a case run in OpenFOAM which is written in C. Software used: OpenFOAM CFD Case: I am trying to solve the Shallow Water Equations using the OpenFOAM built in solver shallowWaterFoam. Grid size: 70 x 40 square meters. Iv started with a fine mesh with 20 cells per meter and have reduced it to 5 cells per meter for run-time reduction. Reducing it further may affect the accuracy of the output!!! Current Hardware: Intel Core i7-3770 ---> 3.4 Ghz x 8 Graphics: Gallium 0.4 on NVE7 Cache: 3MB Can you suggest some best choices for profiling packages? Thanks