nemesis has this performance degradation issue [when oversubscribing cpu-cores] - so --download-mpich defaults using -download-mpich-device=ch3:sock [this mode doesn't not have performance degradation]
Satish On Mon, 23 Mar 2015, Matthew Knepley wrote: > On Mon, Mar 23, 2015 at 8:21 AM, Lisandro Dalcin <[email protected]> wrote: > > > At least one test for DMDA executes in 32 processes. My desktop > > machine has 8 cores, my laptop just 4. Running testexamples make them > > totally unresponsive for a while. Any ideas about how to improve this? > > > > It should not do that. What MPICH device do you use? Maybe try fork? > > Thanks, > > Matt > > > > mpiexec -n 32 ./ex36 -mx 5 -my 5 -mz 5 -nl 3 -dim 3 -cmap 1 > > -da_refine_x 1 -da_refine_y 3 -da_refine_z 4 > > > > -- > > Lisandro Dalcin > > ============ > > Research Scientist > > Computer, Electrical and Mathematical Sciences & Engineering (CEMSE) > > Numerical Porous Media Center (NumPor) > > King Abdullah University of Science and Technology (KAUST) > > http://numpor.kaust.edu.sa/ > > > > 4700 King Abdullah University of Science and Technology > > al-Khawarizmi Bldg (Bldg 1), Office # 4332 > > Thuwal 23955-6900, Kingdom of Saudi Arabia > > http://www.kaust.edu.sa > > > > Office Phone: +966 12 808-0459 > > > > > >
