Shuangshuang If you do want to keep multiple versions of MPI/Compilers/Libs etc. then use the environment modules package. It is a simple one time install that will make your life easy.
http://modules.sourceforge.net/ T On Apr 16, 2013, at 1:29 PM, Jed Brown wrote: > "Jin, Shuangshuang" <Shuangshuang.Jin at pnnl.gov> writes: > >> Hello, everyone, I'm trying to run the following example: >> http://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/examples/tutorials/ex12.c.html >> >> It is said that this example solves a linear system in parallel with >> KSP. >> >> However, when I ran it on my clusters, I always got the same copy >> running multiple times. I printed the Istart and Iend numbers right >> after the MatGetOwnershipRange, and noticed that the index on each >> processor are all the same, which is [0, 56]. > > Your mpiexec does not match the MPI library you compiled with.
