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Memory leakage in leastSquaresVolPointInterpolation

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Old   January 30, 2020, 07:47
Post Memory leakage in leastSquaresVolPointInterpolation
Emad Tandis
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Hello All,

This post aims at sharing an experience about leastSquaresVolPointInterpolation class which is used to interpolate variables from cells to points.
Actually, I faced a problem, called "memory leakage", in the past years for two of my solvers for which the memory is increasing as the simulation goes on. Recently, I faced this again in a my modified version of icoFsiNonLinElasticULSolidFoam, in which I had to use small time step (1e-10) and therefore, the the simulation needed many time steps to reach steady state solution. However, the process in Linux was killed after 2 days for several times. By delving into the process log, I noticed that memory was increasing from 200 MB to 20 GB throughout the simulation!

The reason for this was because of using too many pointers in the class of leastSquaresVolPointInterpolation. By changing the pointer type type to autoPtr<T>, which allows for automatic release of memory, and also some modification according to this type, the problem of memory leakage was eliminated and the memory usage stayed at 200 MB for seven days.

You might find some useful tips on "memory leakage" in the below link:

I hope this helps especially for those working in solid solvers.
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