[petsc-users] ERROR: Scalar value must be same on all processes

[Barry Smith]

   This error message is almost always because a Nan or Inf has crept into the numbers and then gotten into a norm or inner product. 
You can run with -fp_trap or run a debugger and have it catch floating point exceptions to see the first point where the Nan or Inf appeared and help track down the cause.  But do all this tracking down using a debug version of the library without all the extra optimization flags you have put into the COPTFLAGS flags etc.

  Barry

> On May 23, 2015, at 12:27 PM, Vijay Gopal Chilkuri <vijay.gopal.c at gmail.com> wrote:
> 
> Hi,
> 
> I'm having problems calculating large number of eigenvalues(nev>400) with SLEPc, i get perfect results with small number of eigenvalues.
> 
> 
> PETSc: Branch: origin/maint ; commit: 2b04bc0
> SLEPc: Branch: origin/maint ; commit: e1f03d9
> 
> This is the error message i get:
> 
> Intel Parallel Studio XE 2013 loaded
> Intel(R) MPI Library 4.1 (4.1.3.049) loaded
> [0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> [0]PETSC ERROR: Invalid argument
> [0]PETSC ERROR: Scalar value must be same on all processes, argument # 3 
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.5.3, unknown¬
> [0]PETSC ERROR: ./ex1 on a arch-linux2-c-opt named eoscomp7 by vijayc Sat May 23 19:04:55 2015
> [0]PETSC ERROR: Configure options --with-64-bit-indices --with-cc=mpiicc --with-fc=mpiifort --with-cxx=mpiicpc --with-debugging=1 --FOPTFLAGS="-O3 -xAV
> X -fno-alias -no-prec-div -no-prec-sqrt -ip " --COPTFLAGS="-O3 -xAVX -fno-alias -no-prec-div -no-prec-sqrt -ip " --CXXOPTFLAGS="-O3 -xAVX -fno-alias -no-prec-div -no-prec-sqrt -ip " --download-fblaslapack --with-x=false
> [0]PETSC ERROR: #1 BVScaleColumn() line 380 in /eos1/p1517/vijayc/slepc_basic/src/sys/classes/bv/interface/bvops.c
> [0]PETSC ERROR: #2 EPSFullLanczos() line 200 in /eos1/p1517/vijayc/slepc_basic/src/eps/impls/krylov/krylov.c
> [0]PETSC ERROR: #3 EPSSolve_KrylovSchur_Symm() line 56 in /eos1/p1517/vijayc/slepc_basic/src/eps/impls/krylov/krylovschur/ks-symm.c
> [0]PETSC ERROR: #4 EPSSolve() line 99 in /eos1/p1517/vijayc/slepc_basic/src/eps/interface/epssolve.c
> [0]PETSC ERROR: #5 main() line 143 in /users/p1517/vijayc/modelization/ntrou3/sites_18/obc_10/isz_0/ex1.c
> [0]PETSC ERROR: ----------------End of Error Message -------send entire error message to petsc-maint at mcs.anl.gov----------
> application called MPI_Abort(MPI_COMM_WORLD, 62) - process 0
> 
> thanks a lot,
>  Vijay