[petsc-users] Installation question

[Satish Balay]

Presumably your cluster already has a recommended MPI to use [which is
already installed. So you should use that - instead of
--download-mpich=1

Satish

On Wed, 19 Apr 2017, Pham Pham wrote:

> Hi,
> 
> I just installed petsc-3.7.5 into my university cluster. When evaluating
> the computer system, PETSc reports "It appears you have 1 node(s)", I donot
> understand this, since the system is a multinodes system. Could you please
> explain this to me?
> 
> Thank you very much.
> 
> S.
> 
> Output:
> =========================================
> Now to evaluate the computer systems you plan use - do:
> make PETSC_DIR=/home/svu/mpepvs/petsc/petsc-3.7.5
> PETSC_ARCH=arch-linux-cxx-opt streams
> [mpepvs at atlas7-c10 petsc-3.7.5]$ make
> PETSC_DIR=/home/svu/mpepvs/petsc/petsc-3.7.5 PETSC_ARCH=arch-linux-cxx-opt
> streams
> cd src/benchmarks/streams; /usr/bin/gmake  --no-print-directory
> PETSC_DIR=/home/svu/mpepvs/petsc/petsc-3.7.5 PETSC_ARCH=arch-linux-cxx-opt
> streams
> /home/svu/mpepvs/petsc/petsc-3.7.5/arch-linux-cxx-opt/bin/mpicxx -o
> MPIVersion.o -c -Wall -Wwrite-strings -Wno-strict-aliasing
> -Wno-unknown-pragmas -fvisibility=hidden -g -O
> -I/home/svu/mpepvs/petsc/petsc-3.7.5/include
> -I/home/svu/mpepvs/petsc/petsc-3.7.5/arch-linux-cxx-opt/include
> `pwd`/MPIVersion.c
> Running streams with
> '/home/svu/mpepvs/petsc/petsc-3.7.5/arch-linux-cxx-opt/bin/mpiexec ' using
> 'NPMAX=12'
> Number of MPI processes 1 Processor names  atlas7-c10
> Triad:         9137.5025   Rate (MB/s)
> Number of MPI processes 2 Processor names  atlas7-c10 atlas7-c10
> Triad:         9707.2815   Rate (MB/s)
> Number of MPI processes 3 Processor names  atlas7-c10 atlas7-c10 atlas7-c10
> Triad:        13559.5275   Rate (MB/s)
> Number of MPI processes 4 Processor names  atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10
> Triad:        14193.0597   Rate (MB/s)
> Number of MPI processes 5 Processor names  atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10
> Triad:        14492.9234   Rate (MB/s)
> Number of MPI processes 6 Processor names  atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10
> Triad:        15476.5912   Rate (MB/s)
> Number of MPI processes 7 Processor names  atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10
> Triad:        15148.7388   Rate (MB/s)
> Number of MPI processes 8 Processor names  atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10
> Triad:        15799.1290   Rate (MB/s)
> Number of MPI processes 9 Processor names  atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10
> Triad:        15671.3104   Rate (MB/s)
> Number of MPI processes 10 Processor names  atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10
> Triad:        15601.4754   Rate (MB/s)
> Number of MPI processes 11 Processor names  atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10
> Triad:        15434.5790   Rate (MB/s)
> Number of MPI processes 12 Processor names  atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10
> atlas7-c10 atlas7-c10 atlas7-c10 atlas7-c10
> Triad:        15134.1263   Rate (MB/s)
> ------------------------------------------------
> np  speedup
> 1 1.0
> 2 1.06
> 3 1.48
> 4 1.55
> 5 1.59
> 6 1.69
> 7 1.66
> 8 1.73
> 9 1.72
> 10 1.71
> 11 1.69
> 12 1.66
> Estimation of possible speedup of MPI programs based on Streams benchmark.
> It appears you have 1 node(s)
> Unable to plot speedup to a file
> Unable to open matplotlib to plot speedup
> [mpepvs at atlas7-c10 petsc-3.7.5]$
> [mpepvs at atlas7-c10 petsc-3.7.5]$
>