On Tue, Nov 20, 2012 at 1:08 AM, Fande Kong <fd.kong at siat.ac.cn> wrote:
> It seems to be a good idea. I have another related question. If all > processors read the same file at the same time, would it be very slow for > conflicting access? Yes, though it's much better if you use MPI-IO collective IO. The worst is if every process reads a different file. > > > On Mon, Nov 19, 2012 at 4:52 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote: > >> On Tue, Nov 20, 2012 at 12:38 AM, Fande Kong <fd.kong at siat.ac.cn> wrote: >> >>> I want to try very 'large' mesh. I guess it should be bottleneck. >> >> >> It's really worth profiling. Having every process read directly is no >> more scalable (frequently less, actually) than having rank 1 read >> incrementally and send to whoever should own it. You can do full parallel >> IO, but the code depends on the mesh format. >> > > > > -- > Fande Kong > ShenZhen Institutes of Advanced Technology > Chinese Academy of Sciences > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20121120/4e078cd0/attachment.html>
