BwUniCluster2.0/Maintenance/2020-10: Difference between revisions

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= Operating system =
= Operating system =


* The operating system version is upgraded to Red Hat Enterprise Linux (RHEL) 8.2. We recommend to re-compile all applications after the upgrade.
* The operating system version will be upgraded to Red Hat Enterprise Linux (RHEL) 8.2. We recommend to re-compile all applications after the upgrade.


* The Linux kernel version is upgraded to 4.18 (from 3.10).
* The Linux kernel version will be upgraded to 4.18 (from 3.10).


* The Mellanox OFED InfiniBand Stack is upgraded to version 4.9 (from 4.7). If you maintain libraries which directly link against OFED libraried (e.g. MPI or PGAS libraries compiled in your $HOME directory) we recommend to re-compile these libraries after the upgrade.
* The Mellanox OFED InfiniBand Stack will be upgraded to version 4.9 (from 4.7). If you maintain libraries which directly link against OFED libraried (e.g. MPI or PGAS libraries compiled in your $HOME directory) we recommend to re-compile these libraries after the upgrade.


= Compilers, Libaries and Runtime Environments =
= Compilers, Libaries and Runtime Environments =


* The GNU C Library (glibc) is upgraded to version 2.28 (from 2.17). This version will no longer automatically print backtraces after stack checking failures due to security hardening, which might affect the debugging of applications.
* The GNU C Library (glibc) will be upgraded to version 2.28 (from 2.17). This version will no longer automatically print backtraces after stack checking failures due to security hardening, which might affect the debugging of applications.


* The default system compiler is upgraded to GCC version 8.3.1 (from 4.8.5).
* The default system compiler will be upgraded to GCC version 8.3.1 (from 4.8.5).


* The Intel compiler modules will not change.
* The Intel compiler module versions will not change.


* The Clang 8 module will probably be replaced in favor of Clang 10. The final decision has not been made yet. Clang 9 will continue to be available in any case.
* The Clang 8 module will probably be replaced in favor of Clang 10. The final decision has not been made yet. Clang 9 will continue to be available in any case.


* The system ''Python'' version is upgraded to 3.6. If no other Python module is loaded, the ''python'' command will default to Python 3.6, while Python 2.7 can be used with the ''python2'' command.
* The system ''Python'' version will be upgraded to 3.6. If no other Python module is loaded, the ''python'' command will default to Python 3.6, while Python 2.7 can be still used with the ''python2'' command.


* The system ''Perl'' version is upgraded to 5.26.
* The system ''Perl'' version will be upgraded to 5.26.


= Development tools =
= Development tools =


* The default system version of the ''GNU Make'' build utility is upgraded to 4.2.1. Please note the new ''--output-sync'' command line option that allows better debugging of parallel builds.
* The default system version of the ''GNU Make'' build utility will be upgraded to 4.2.1. Please note the new ''--output-sync'' command line option that allows better debugging of parallel builds.


* The default system version of the ''CMake'' build system is upgraded to 3.11.
* The default system version of the ''CMake'' build system will be upgraded to 3.11.


* The default system version of the ''Git'' version control utility is upgraded to 2.18.
* The default system version of the ''Git'' version control utility will be upgraded to 2.18.


= Userspace tools =
= Userspace tools =


* The ''screen'' utility is no longer supported. The recommended replacement is ''tmux''.
* The ''screen'' utility will no longer be supported. The recommended replacement is ''tmux''.


= Batch system =
= Batch system =

Revision as of 12:21, 10 September 2020

The following changes are planned for the maintenance interval starting on 06.10.2020 (Tuesday) and ending on 13.10.2020 (Tuesday).

This information is still preliminary and subjected to change.

Operating system

  • The operating system version will be upgraded to Red Hat Enterprise Linux (RHEL) 8.2. We recommend to re-compile all applications after the upgrade.
  • The Linux kernel version will be upgraded to 4.18 (from 3.10).
  • The Mellanox OFED InfiniBand Stack will be upgraded to version 4.9 (from 4.7). If you maintain libraries which directly link against OFED libraried (e.g. MPI or PGAS libraries compiled in your $HOME directory) we recommend to re-compile these libraries after the upgrade.

Compilers, Libaries and Runtime Environments

  • The GNU C Library (glibc) will be upgraded to version 2.28 (from 2.17). This version will no longer automatically print backtraces after stack checking failures due to security hardening, which might affect the debugging of applications.
  • The default system compiler will be upgraded to GCC version 8.3.1 (from 4.8.5).
  • The Intel compiler module versions will not change.
  • The Clang 8 module will probably be replaced in favor of Clang 10. The final decision has not been made yet. Clang 9 will continue to be available in any case.
  • The system Python version will be upgraded to 3.6. If no other Python module is loaded, the python command will default to Python 3.6, while Python 2.7 can be still used with the python2 command.
  • The system Perl version will be upgraded to 5.26.

Development tools

  • The default system version of the GNU Make build utility will be upgraded to 4.2.1. Please note the new --output-sync command line option that allows better debugging of parallel builds.
  • The default system version of the CMake build system will be upgraded to 3.11.
  • The default system version of the Git version control utility will be upgraded to 2.18.

Userspace tools

  • The screen utility will no longer be supported. The recommended replacement is tmux.

Batch system

  • The maximum total number of jobs of a single user in all queues (running and waiting) will be reduced to 100 (from 200).

Graphics stack

  • The K Desktop Environment (KDE) is no longer supported. start_vnc_desktop will default to GNOME 3.28 instead.
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