We've looked at this several times and it's very difficult to estimate memory growth for complex C++ software. Each data structure that's spread throughout the code uses their own memory allocator to store information as needed. Even if you know things like the sizes of individual nodes in a node based container or the sizes of items and the number of items in a vector, it's still difficult to capture the amount of memory in use everywhere as the code changes and new data structures are added or removed.
As you run in parallel the amount of overhead can change depending on a lot of factors. Changing out your preconditioner or changing solver strategy can drastically change your memory usage. So like you, we monitor things empirically to figure out the amount of memory to reserve and it's a difficult process. We (MOOSE) have tools that can monitor your memory usage for a given simulation so you can see trends over time to aid in figuring this out, but we've never found a bulletproof solution to this problem. Cody On Thu, Mar 23, 2017 at 9:39 AM Fabio Canesin <fabio.cane...@gmail.com> wrote: > Dear experts, > > Is there a api for computing the memory requirements of a FEMSystem or > EquationSystem ? > In running a navier-stokes 1MM mesh I constantly hit memory errors, even > with ParallelMesh. > > My intent is to compute how much memory I need in each node for each number > of mpi tasks before submitting the job (for now, I'm using a trial-error > empirical relation). > > Regards, > Fábio > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Libmesh-users mailing list > Libmesh-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/libmesh-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
