"Kong, Fande" <[email protected]> writes: >> Correct. The hash needs to be converted to a matrix so the maximum >> memory usage is about double that of precise preallocation in advance. >> > > > Will the memory be released in the hash after assembling the matrix?
Of course. >> But this is only the first assembly, which is usually done before >> setting up preconditioners and Krylov spaces so in most cases would not >> significantly affect the maximum memory usage of the application. >> > > If the nonzero structure changes over Newton iterations, and the maximum > memory usage of the application may be larger than that with the precise > preallocation. That qualifies as a "not usual" use case, and yes, that's why precise preallocation is better when you have it.
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