On Tue, Sep 28, 2010 at 09:12:47PM -0000, cutejeff wrote: > New question #127219 on DOLFIN: > https://answers.launchpad.net/dolfin/+question/127219 > > I have been doing the mesh refinement convergence study. The simulations > worked very well for meshes Rectangle(0,0,5,5,50,50) and > Rectangle(0,0,5,5,50,100). But if I use a finer mesh > Rectangle(0,0,5,5,100,100), it caused the "out of memory" error. > > I have 10G memory on my computer and I looked at the hardinfo, I still have > about 5-6g memory left when Fenics was running. So I guess there are some > limitations on memory allocation in Fenics. Is there a way to allocate more > memory for Fenics? > > What should I do in my case? Because I have a high order equation(4th), and > it's kind of complicated, I split it into 4 mixed equations. Therefore, it > requires V*V*V*V function spaces and makes the linear system size (161604 x > 161604) much bigger than a single equation. > > I am considering to make less mixed equations. But I don't know how to do it. > Isn't mixed-equations the only way for high order PDE? > For example in 1D case, du/dt+ d/dx(u+u''')=0, what all I know to do this is > that, split it into 3 equations > du/dt+dT=0 > T=u+dK/dx > K=u'' > > Then I can make weak form for equation3, and it works. But I have to have 3 > mixed equations. Is this the only way to do it? I couldn't find any examples > in demos. > > Any suggestions would help a lot. Thank you.
Do you have a 64bit operating system? Otherwise, I expect you will not be able to allocate more than 4GB with any single program. -- Anders _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : dolfin@lists.launchpad.net Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
