[petsc-dev] [petsc-users] Bad memory scaling with PETSc 3.10

Zhang, Hong hzhang at mcs.anl.gov
Wed Mar 27 10:34:21 CDT 2019

- PETSc 3.6.4 (reference)
- PETSc 3.10.4 without specific options
- PETSc 3.10.4 with the three scalability options you mentionned
What are the 'three scalability options' here?
What is "MaxMemRSS", the max memory used by a single core? How many cores do you start with?

Do you have 'execution time scalability' plot?

On Wed, Mar 27, 2019 at 8:47 AM Mark Adams via petsc-dev <petsc-dev at mcs.anl.gov<mailto:petsc-dev at mcs.anl.gov>> wrote:
So is this the instructions that I should give him? This grad student is a quick study but he has not computing background. So we don't care what we use, we just want to work (easily).


Do not use "--download-fblaslapack=1". Set it to 0. Same for "--download-mpich=1".

Now do:

> module load mkl

> export BLAS_LAPACK_LOAD=--with-blas-lapack-dir=${MKLROOT}


And use

--with-cc=${MPICH_HOME}/mpicc --with-cxx=${MPICH_HOME}/mpicxx --with-fc=${MPICH_HOME}/mpif90

instead of clang++

On Wed, Mar 27, 2019 at 9:30 AM Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>> wrote:
On Wed, Mar 27, 2019 at 8:55 AM Victor Eijkhout via petsc-dev <petsc-dev at mcs.anl.gov<mailto:petsc-dev at mcs.anl.gov>> wrote:
On Mar 27, 2019, at 7:29 AM, Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>> wrote:

How should he configure to this? remove "--download-fblaslapack=1" and add ....

1. If using gcc

module load mkl

with either compiler:

export BLAS_LAPACK_LOAD=--with-blas-lapack-dir=${MKLROOT}

2.  We define MPICH_HOME for you.

With Intel MPI:

  export PETSC_MPICH_HOME="${MPICH_HOME}/intel64"
  export mpi="--with-mpi-compilers=1 --with-mpi-include=${TACC_IMPI_INC} --with-mpi-lib=${TACC_IMPI_LIB}/release_mt/libmpi.so”

with mvapich:

  export mpi="--with-mpi-compilers=1 --with-mpi-dir=${PETSC_MPICH_HOME}”

(looks like a little redundancy in my script)

I think Satish now prefers

  --with-cc=${MPICH_HOME}/mpicc --with-cxx=${MPICH_HOME}/mpicxx --with-fc=${MPICH_HOME}/mpif90




What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

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