info specific to sutton, rondeau, pelee

A CFI proposal by Profs. Stastna, Poulin, and Lamb resulted in acquisition of new servers in late 2023.

Hostnames and Hardware

• sutton.math.private.uwaterloo.ca (Dell R7625)
  • 2 AMD EPYC 9454 2.75 GHz 48-core CPUs, 768 GB RAM, ~90 TB storage
• pelee.math.private.uwaterloo.ca (Dell XE8545)
  • 2x AMD EPYC 7713 2.0 GHz 64-core CPUs, 1 TB RAM, four NVIDIA A100 40 GB GPUs
• rondeau.math.private.uwaterloo.ca (Dell XE8545)
  • same as pelee

Operating System Software and vendor add-ons

• Ubuntu 22.04 LTS

System Administration

• MFCF administers these machines. Users do not have root access.
• System management is done by SaltStack software, unlike hood which is managed using MFCF's XHier
  • this means things will be different
  • applications are not under the /software directory anymore
  • default PATH does not have everything in it
  • details below

File Systems

• home directories are NFS-mounted from sutton
  • that's where you are when you log in
  • do not run models from your home directory: it's too small
• the old /fsys2, /fsys3, /fsys4, /fsys5, /fsys6, /fsys7 file systems are NFS-mounted from hood.math
  • these are under /mnt/autofs/hood.math/
• /fsys1 and /fsys2 are large file systems on sutton exported by NFS to the others
  • if you don't have a personal drectory here, ask MFCF

Application Software, Development Environment

Wherever satisfactory versions are provided by the OS distribution, things like library and include files are installed at default locations such as /usr/lib64 and /usr/include.

Third party applications are installed as modules under /opt. Run the command module avail to see what's available.

Login shell environment

• the recommended .cshrc and .profile files set up your environment automatically with recommended compilers, libraries, etc. mentioned below to work with the configuration files included with models such as SPINS, MITgcm, IGW
  • see the Login script wiki page for details
• some optional software comes in "module" format (see man module)
  • to see a list of available modules, run module avail
    • this also shows which ones you have loaded already
  • load one using its exact name as shown in the list e.g. MATLAB, module load matlab/2017a-research
  • use module unload modulename to unload a module, e.g. if you want to switch to an alternative one

Compilers

• gcc 11.4 is in standard search rules, no need to load it with a module command

MPI environments

Choose from MPICH, OpenMPI,

• MPICH ???

• OpenMPI 4.1.2

MATLAB

• version 2202b
• module load matlab/2022b-research
• check module avail to see available versions

Python

• default python3 is 3.10.x
• NumPY, SciPY, etc. are installed
• you can install other packages, such as matplotlib, via: pip3 install --user matplotlib

Models

• MIT GCM - NOT PREPARED YET - OLD NOTES
  • see config file called bow_mpt in the MITgcm section of the main Models page in this wiki
  • first need to load an MPI module, such as mpt/2.16 or hmpt/2.25
  • ensure you call genmake2 with the -mpi flag
  • GNU Fortran compiler seems pickier about some things than Intel compiler so you may see new complaints about previously-working code
  • here is a sample SLURM MITgcm script. See more SLURM information below.

• NCL NCARG version 6.4.0, without OPeNDAP - NOT PREPARED YET - OLD NOTES
  • set environment variable NCARG_ROOT to /opt/ncl-6.4.0 and add $NCARG_ROOT/bin to your $PATH
  • optionally, make a .hluresfile in your home directory if you want to customize your NCL graphical environment

• SPINS - NOT PREPARED YET - OLD NOTES
  • so far we have one system configuration file
    • bow.gcc.mpt.blas.sh
    • with symbolic link to that called bow.sh, since it's the only one we have so far
  • as the name suggests, it is set up to expect GCC, SGI/HPE MPT, and default BLAS and LAPACK
    • so you need to load the MPT module first
  • we expect to develop alternative configuration files for other compilers, MPI implementations, and numerical libraries for comparison to find an optimum set-up
  • the spins2netcdf SPINS to NetCDF converter is available in standard search rules at /usr/local/bin/spins2netcdf (Version 2.0.0.0 from April 2018)

Visualization

• ParaView 5.4.1 - NOT DONE YET
  • installed at /opt/paraview/

• VisIT 2.13.0 - NOT DONE YET
  • installed at /opt/visit/

• FFMPEG 4.4.x
  • in standard search rules

• the ImageMagick suite
  • commands such as 'display' and 'convert'; see "man imagemagick"

Scheduler - NOT UPDATED FOR THESE MACHINES YET

These machines use SLURM to schedule jobs. This means that instead of running jobs live, they need to be submitted to a queue. See the Submitting Jobs section of the Graham Tips page for more about SLURM

Expected use of SLURM

• SLURM head node is fluids-pr1-01.math.private.uwaterloo.ca, alias fluidssubmit.math.private.uwaterloo.ca
  • runs a different OS from compute nodes
  • can't compile there, only submit jobs there
• need SLURM module in your environment
  • recommended .cshrc and .profile do that for you (see the Login script page)
• must include #SBATCH --partition=<partition_name> flag in your submit script
  • use partition name fluids_short for jobs under 8 hours
  • use partition name fluids_long for jobs up to 40 days

MPI jobs that span the machines: The easy way (but not recommended)

When you want to span an MPI job across multiple machines, performance should be better if you force the use of the private 40 Gb network that the three machines share. This is a bit awkward with SLURM (see next section). As long as there is no contention for resources, you may run such jobs outside of SLURM. With the mpirun command, use "-a mountainlakes" to specify the machine-spanning array, and comma-separated special hostnames with -np for number of processes. The special hostnames have "-pn" (for "private network") appended to identify the dedicated high-speed network interfaces. For example (assuming you are using HPE/SGI MPT, not OpenMPI or MPICH):

% mpirun -a mountainlakes waterton-pn -np 2, minnewanka-pn -np 2 ./a.out
Hello, world! I am 2 of 4 on host minnewanka.
Hello, world! I am 0 of 4 on host waterton.
Hello, world! I am 3 of 4 on host minnewanka.
Hello, world! I am 1 of 4 on host waterton.

See "man array" for ways you can inspect activities across the array of machines.

MPI jobs that span the machines: The awkward way (recommended)

If there is any contention for resources, use SLURM. Special steps are needed to force it to use the private high-speed network because the SLURM head node cannot see that network itself. By using the --nodelist option, the SLURM_JOB_NODELIST environment variable, and some list manipulation, we can pass the special private network hostnames (suffix "-pn") through to the mpirun command. Here is an example sbatch script:

 #!/bin/bash
#SBATCH --mail-user=<userid>@uwaterloo.ca
#SBATCH --mail-type=BEGIN,END,FAIL
#SBATCH --job-name="mpi_job"
#SBATCH --account=igw_acct       #<== your slurm account
#SBATCH --partition=fluids_long  #<== partition: fluids_long or fluids_short
#SBATCH --time=00:01:00
#SBATCH --nodelist=waterton,minnewanka  #<== specify machines
#SBATCH --ntasks=16
#SBATCH --ntasks-per-node=8
#SBATCH --mem-per-cpu=1GB
#SBATCH --output=%j.out
#SBATCH --error=%j.err

# Your code below this line
# First set the environment for using  mpt
module load mpt

# compile your code
make clean
make

# create an array of nodes list from  SLURM_JOB_NODELIST env. variable
nodes=($(echo $SLURM_JOB_NODELIST | tr "," " "))

# debugging  messages
echo "=========================================="
echo "slurm ntasks      = $SLURM_NTASKS         "
echo "slurm ntasks/Node = $SLURM_NTASKS_PER_NODE"
echo "slurm Nodes = $SLURM_JOB_NODELIST"
echo "slurm Node[0] = ${nodes[0]}"
echo "slurm Nodes[1] = ${nodes[1]}"
echo "=========================================="
echo
echo
set -x

mpirun -a mountainlakes ${nodes[0]}-pn -np $SLURM_NTASKS_PER_NODE, ${nodes[1]}-pn -np  $SLURM_NTASKS_PER_NODE ./my_mpi_program