Upgrade to SLURM at 9AM on Dec 2
It is scheduled to have an update to SLURM scheduler at 9AM on Wednesday, December 2nd. The upgrade will have no impact on running jobs and will only make the SLURM scheduler unavailable for user commands for approximately 3 minutes. This update is from 20.02.5 to 20.02.6, and includes a few critical security patches and bug fixes.
owens slurm migration
OSC will be migrating the owens cluster from torque/moab to slurm on Dec. 15, 2020. We encourage users to participate in the early user program from Nov. 23 to Dec. 14 to test their workflows with the new scheduler. No registration needed.
Jobs submitted in the owens early user environment will not be charged.
For more info: https://go.osu.edu/Bzkw
System Downtime December 15 2020
A downtime for all OSC HPC systems is scheduled from 7 a.m. to 9 p.m., Tuesday, December 15, 2020. The downtime will affect the Pitzer and Owens Clusters, web portals, state-wide licenses, and HPC file servers. Login services will not be available during this time, including MyOSC.
In preparation for the downtime, the batch scheduler will begin holding jobs that cannot be completed before 7 a.m., December 15, 2020.
Environment changes in Slurm migration
As we migrate to Slurm from Torque/Moab, there will be necessary software environment changes.
Decommissioning old MVAPICH2 versions
Old MVAPICH2 including mvapich2/2.1, mvapich2/2.2 and its variants do not support Slurm very well due to its life span, so we will remove the following versions:
- mvapich2/2.1
- mvapich2/2.2, 2.2rc1, 2.2ddn1.3, 2.2ddn1.4, 2.2-debug, 2.2-gpu
As a result, the following dependent software will not be available anymore.
HOWTO: Deploy your own endpoint on a server
OSC clients who are affiliated with Ohio State can deploy their own endpoint on a server using OSU subscriptions. Please follow the steps below:
HOWTO: Tune VASP Memory Usage
This article discusses memory tuning strategies for VASP.
Data Distribution
Typically the first approach for memory sensitive VASP issues is to tweak the data distribution (via NCORE or NPAR). The information at https://www.vasp.at/wiki/index.php/NPAR covers a variety of machines. OSC has fast communications via Infiniband.
HOWTO: Debugging Tips
This article focuses on debugging strategies for C/C++ codes, but many are applicable to other languages as well.
Rubber Duck Debugging
This approach is a great starting point. Say you have written some code, and it does not do what you expect it to do. You have stared at it for a few minutes, but you cannot seem to spot the problem.