Hehe... John... do you remember that you and I already did this once back when I was working on my thesis? I was seeing the same problem of writing from every node... and we dug down there and put a bunch of those statements in. I guess it never actually got checked in though.... and I'm not even sure I still have that code around.
This is why I'm not committing my stuff a lot more often... don't want to lose it. Derek On Nov 26, 2007 11:15 AM, John Peterson <[EMAIL PROTECTED]> wrote: > OK, so it's not an n^2 algorithm, but XdrIO::write() currently gets > called on all CPUs, and so all of them try to write to the same file > at the same time. Turns out this is a lot more noticeable on 128 CPUs > than it is on 4... > > The fix should be to wrap the call to write in if (processor_id==0) > as is done for GMVIO. I'll try to check this fix in today. > > -John > > > John Peterson writes: > > Benjamin Kirk writes: > > > > I haven't had a chance to look into this closely yet, but I just > wanted to > > > > post something here so I would remember to. In writing out some > relatively > > > > large (36x36x36 Hex27's) meshes recently, mesh.write() apparently > took 1268 > > > > seconds!! > > > > > > I'm guessing it was an xdr file?? I've never seen anything that slow, > but > > > certainly it is worth looking in to. I'm guessing writing a cube > should be > > > able to reproduce the problem? > > > > I can't reproduce this error in the CFDLab... writing the same size > > mesh takes about 4 seconds there. TACC has been having some troubles > > with their $WORK filesystem lately, so maybe that was it. It'd be nice > > not to have to wait 20 minutes at the end of a run for the mesh to be > > written, though ;-) > > > > -J > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Libmesh-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/libmesh-devel > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Libmesh-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-devel
