Matlab - memory usage after solving a large system -

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i'm trying calculate memory used matlab process before , after solving large sparse matrix. i'm using memory , direct solver a\b.

what want mesaure monitoring in way memory used matlab , calculate difference between memory used after loading file containing sparse matrix , memory used after solving sparse system.

here code i'm using

% load , store sparse matrix a = load('very_large_sparse_matrix.mat');  % store memory used after loading usr = memory; memory_after_load = usr.memusedmatlab;  % solve system % no matter b comes x = a\b  % store memory used after solving usr = memory; memory_after_solve = usr.memusedmatlab;  % print difference disp(memory_after_solve - memory_after_load);

but difference 0 or negative integer. think because matlab pre-allocates memory before running code (am wrong?) , doesn't change allocation dinamically if not emergency.

i expect increase of memory used, because through direct solvers fill-in increase number of non-zero elements.

how can calculate it? have seen whos gives size in bytes of variable, i'm looking memory used process.

thank you.

edit

i've found matlab pre-allocates resources. equivalent question is there method disable pre-allocating system?

thanks @horchler, i've found solution.

even if matlab pre-allocates memory needs before execution, spparams('spunomi', 3) shows peaks inside allocation.

also doing [l,u,p,q,r] = lu(a) , calculating difference between number of nonzero elements in l , number of nonzero elements in a, function whos leads same results!


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