Difference between revisions of "Rolling Upgrade from RHEL7 to RHEL8"

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{{Note|The EL7->EL8 migration of compute and login nodes on HiPerGator and HPG-AI is complete. Make sure to remove el7 constraint from your job scripts.|warn}}
 
==HiPerGator OS Upgrade: RHEL-7 → RHEL-8==
 
==HiPerGator OS Upgrade: RHEL-7 → RHEL-8==
  
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HiPerGator is beginning rolling upgrade process from Red Hat Enterprise Linux version 7 (RHEL-7) to version 8 (RHEL-8). The upgraded software environment will include updates to important components including, but not limited to, NVIDIA GPU drivers, CUDA (12.x), communication libraries, compilers (gcc/12 and intel/2023), and OpenMPI (4.1.5).   
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HiPerGator has gone through a rolling upgrade process from Red Hat Enterprise Linux version 7 (RHEL-7) to version 8 (RHEL-8). The upgraded software environment includes updates to important components including, but not limited to, NVIDIA GPU drivers, CUDA (12.2), communication libraries, compilers (gcc/12 and intel/2023), and OpenMPI (4.1.5).   
  
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Some programs/workflows will run in the updated software environment without any modification, and some will require recompilation or adaptation.
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Some programs/workflows run in the updated software environment without any modification, and some require recompilation or adaptation.
  
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==What will happen==
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==Rebuilding Code for EL8==
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'''Note:''' PMIX v2 is no longer supported in EL8.
  
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On August 16, 2023, a subset of HiPerGator compute resources will go online with the updated software environment.  On the same day, a new login node pool will be introduced as <code>hpg-el8.rc.ufl.edu</code> that runs the updated software environment.  If you need to rebuild your application, you can do it here.
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If you see an error regarding pmix v2, such as "''error while loading shared libraries: libpmix.so.2: cannot open shared object file: No such file or directory''", we recommend using the following environment modules to rebuild your code for EL8:
  
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Over the next 6-7 weeks, additional compute resources will be upgraded at a steady rate until they are all upgraded. Once more than half of the compute resources are upgraded, the new login nodes will become default as <code>hpg.rc.ufl.edu</code>.
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* gcc/12.2.0 openmpi/4.1.5
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* cuda/12.2.2 gcc/12.2.0 openmpi/4.1.5
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We recommend moving to RHEL-8 at your earliest convenience.
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* intel/2020 openmpi/4.1.5
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==Choosing RHEL-7 or RHEL-8==
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* cuda/12.2.2 intel/2020 openmpi/4.1.5
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* nvhpc/23.7 openmpi/4.1.5
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Using the '--constraint' SLURM directive, it is possible to submit jobs specifically targeting RHEL-7 with '--constraint=el7' or RHEL-8 with '--constraint=el8'. If neither is specified, the scheduler will not consider operating system in placing your jobs and  you may get either or a mix depending on the number of requested nodes.
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* cuda/12.2.2 nvhpc/23.7 openmpi/4.1.5
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#SBATCH --constraint=el8
 
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or
 
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#SBATCH --constraint=el7
 
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==How long will RHEL-7 systems remain available on HiPerGator?==
 
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At this time, we expect to complete the upgrade process on September 20, 2023.  If you have concerns about access to RHEL-7 systems on HiPerGator after September 20, 2023, please [https://support.rc.ufl.edu/ contact us] as soon as possible to discuss.
 
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==The 'module' command is missing==
 
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If you see an error in the job log about missing 'module' command make sure to
 
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* Submit the job from the appropriate login environment.  
 
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** To use EL7 resources connect to hpg.rc.ufl.edu or ssh into login 1 through 6 within HPG.
 
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** To use EL8 resources connect to hpg-el8.rc.ufl.edu or ssh into login 7 through 12 within HPG.
 
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==Known Issues==
 
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===Missing PMIX_V2===
 
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If you see an error similar to the following
 
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srun: error: Couldn't find the specified plugin name for mpi/pmix_v2 looking at all files
 
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or
 
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error while loading shared libraries: libpmix.so.2: cannot open shared object file: No such file or directory
 
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Then, your job likely landed on en el8 node, which doesn't have pmix v2. Make sure to rebuild your code against a modern OpenMPI stack (openmpi/4.1.5 or later) to work on EL8 before the end of the transition. Until the code is rebuilt please use the el7 SLURM constraint to continue running your analyses.
 
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===Missing libcrypto or libssl 1.0===
 
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The system libcrypto and libssl libraries have been upgraded from version 1.0 (shown as version 10 in some errors) to version 1.1 in EL8. If your code is built against the old libraries it will have to be rebuilt before the end of the transition.
 

Latest revision as of 16:06, 28 September 2023

The EL7->EL8 migration of compute and login nodes on HiPerGator and HPG-AI is complete. Make sure to remove el7 constraint from your job scripts.

HiPerGator OS Upgrade: RHEL-7 → RHEL-8

HiPerGator has gone through a rolling upgrade process from Red Hat Enterprise Linux version 7 (RHEL-7) to version 8 (RHEL-8). The upgraded software environment includes updates to important components including, but not limited to, NVIDIA GPU drivers, CUDA (12.2), communication libraries, compilers (gcc/12 and intel/2023), and OpenMPI (4.1.5).

Some programs/workflows run in the updated software environment without any modification, and some require recompilation or adaptation.

Rebuilding Code for EL8

Note: PMIX v2 is no longer supported in EL8.

If you see an error regarding pmix v2, such as "error while loading shared libraries: libpmix.so.2: cannot open shared object file: No such file or directory", we recommend using the following environment modules to rebuild your code for EL8:

  • gcc/12.2.0 openmpi/4.1.5
  • cuda/12.2.2 gcc/12.2.0 openmpi/4.1.5
  • intel/2020 openmpi/4.1.5
  • cuda/12.2.2 intel/2020 openmpi/4.1.5
  • nvhpc/23.7 openmpi/4.1.5
  • cuda/12.2.2 nvhpc/23.7 openmpi/4.1.5
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