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Adastra (CINES)

The Adastra cluster is located at CINES (France). Each node contains 4 AMD MI250X GPUs, each with 2 Graphics Compute Dies (GCDs) for a total of 8 GCDs per node. You can think of the 8 GCDs as 8 separate GPUs, each having 64 GB of high-bandwidth memory (HBM2E).

Introduction

If you are new to this system, please see the following resources:

  • Adastra user guide
  • Batch system: Slurm
  • Production directories:
    • $SHAREDSCRATCHDIR: meant for short-term data storage, shared with all members of a project, purged every 30 days (17.6 TB default quota)
    • $SCRATCHDIR: meant for short-term data storage, single user, purged every 30 days
    • $SHAREDWORKDIR: meant for mid-term data storage, shared with all members of a project, never purged (4.76 TB default quota)
    • $WORKDIR: meant for mid-term data storage, single user, never purged
    • $STORE : meant for long term storage, single user, never purged, backed up
    • $SHAREDHOMEDIR : meant for scripts and tools, shared with all members of a project, never purged, backed up
    • $HOME : meant for scripts and tools, single user, never purged, backed up

Preparation

Use the following commands to download the WarpX source code:

git clone https://github.com/ECP-WarpX/WarpX.git $HOME/src/warpx

We use system software modules, add environment hints and further dependencies via the file $HOME/adastra_warpx.profile. Create it now:

cp $HOME/src/warpx/Tools/machines/adastra-cines/adastra_warpx.profile.example $HOME/adastra_warpx.profile
.. dropdown:: Script Details
   :color: light
   :icon: info
   :animate: fade-in-slide-down

   .. literalinclude:: ../../../../Tools/machines/adastra-cines/adastra_warpx.profile.example
      :language: bash

Edit the 2nd line of this script, which sets the export proj="" variable using a text editor such as nano, emacs, or vim (all available by default on Adastra login nodes).

Important

Now, and as the first step on future logins to Adastra, activate these environment settings:

source $HOME/adastra_warpx.profile

Finally, since Adastra does not yet provide software modules for some of our dependencies, install them once:

bash $HOME/src/warpx/Tools/machines/adastra-cines/install_dependencies.sh
source $HOME/sw/adastra/gpu/venvs/warpx-adastra/bin/activate
.. dropdown:: Script Details
   :color: light
   :icon: info
   :animate: fade-in-slide-down

   .. literalinclude:: ../../../../Tools/machines/adastra-cines/install_dependencies.sh
      :language: bash

Compilation

Use the following :ref:`cmake commands <building-cmake>` to compile the application executable:

cd $HOME/src/warpx
rm -rf build_adastra

cmake -S . -B build_adastra -DWarpX_COMPUTE=HIP -DWarpX_PSATD=ON -DWarpX_QED_TABLE_GEN=ON -DWarpX_DIMS="1;2;RZ;3"
cmake --build build_adastra -j 16

The WarpX application executables are now in $HOME/src/warpx/build_adastra/bin/. Additionally, the following commands will install WarpX as a Python module:

rm -rf build_adastra_py

cmake -S . -B build_adastra_py -DWarpX_COMPUTE=HIP -DWarpX_PSATD=ON -DWarpX_QED_TABLE_GEN=ON -DWarpX_APP=OFF -DWarpX_PYTHON=ON -DWarpX_DIMS="1;2;RZ;3"
cmake --build build_adastra_py -j 16 --target pip_install

Now, you can :ref:`submit Adstra compute jobs <running-cpp-adastra>` for WarpX :ref:`Python (PICMI) scripts <usage-picmi>` (:ref:`example scripts <usage-examples>`). Or, you can use the WarpX executables to submit Adastra jobs (:ref:`example inputs <usage-examples>`). For executables, you can reference their location in your :ref:`job script <running-cpp-adastra>` .

Update WarpX & Dependencies

If you already installed WarpX in the past and want to update it, start by getting the latest source code:

cd $HOME/src/warpx

# read the output of this command - does it look ok?
git status

# get the latest WarpX source code
git fetch
git pull

# read the output of these commands - do they look ok?
git status
git log     # press q to exit

And, if needed,

As a last step, clean the build directory rm -rf $HOME/src/warpx/build_adastra and rebuild WarpX.

Running

MI250X GPUs (2x64 GB)

In non-interactive runs:

.. literalinclude:: ../../../../Tools/machines/adastra-cines/submit.sh
   :language: bash
   :caption: You can copy this file from ``$HOME/src/warpx/Tools/machines/adastra-cines/submit.sh``.

Post-Processing

Note

TODO: Document any Jupyter or data services.

Known System Issues

Warning

May 16th, 2022: There is a caching bug in Libfabric that causes WarpX simulations to occasionally hang on on more than 1 node.

As a work-around, please export the following environment variable in your job scripts until the issue is fixed:

#export FI_MR_CACHE_MAX_COUNT=0  # libfabric disable caching
# or, less invasive:
export FI_MR_CACHE_MONITOR=memhooks  # alternative cache monitor

Warning

Sep 2nd, 2022: rocFFT in ROCm 5.1-5.3 tries to write to a cache in the home area by default. This does not scale, disable it via:

export ROCFFT_RTC_CACHE_PATH=/dev/null

Warning

January, 2023: We discovered a regression in AMD ROCm, leading to 2x slower current deposition (and other slowdowns) in ROCm 5.3 and 5.4. Reported to AMD and fixed for the next release of ROCm.

Stay with the ROCm 5.2 module to avoid.