Schlagwort: ‘GPU’
GPU TDP reduced on CLAIX 2023 nodes
As of the 30.06.2026 at 11:30 the maximum TDP of the H100 GPUs on CLAIX 2023 nodes has been reduced from the previous value of 700W to 600W.
We implemented this lower TDP to reduce the thermal load on the central cooling system. This central cooling system is operating hotter due to weather and age, causing some specific GPU nodes to trigger thermal protection shutdowns that in turn kill any running jobs on said nodes.
This change is noteworthy for users that perform performance measurements and would like to compare their previous measurements to new ones under the reduced TDP.
For normal usage of the GPUs of CLAIX 2023, this change should not affect validity of results and should provide close to stock times to solution.
Users should not expect longer runtimes in most cases. For extremely intense computations, please recheck if your workflows require more runtime and adjust your batch scripts accordingly. We nevertheless, do not expect this change to affect most users of GPUs and is of no consequence to non-GPU users.
Slurm GPU HPC resource allocation changing on the 01.11.2025
The CLAIX HPC systems will be changing the way GPU resources are requested and allocated starting on the 01.11.2025.
Users submitting Slurm Jobs will no longer be able to request arbitrary amounts of CPU and Memory resources when using GPUs on GPU nodes.
Requesting an entire GPU node’s memory or all CPUs, but only a single GPU will no longer be possible.
Each GPU within a GPU node will have a corresponding strict maximum of CPUs and Memory that can be requested.
To obtain more than the strict maximum of CPUs or Memory per GPU, more GPUs will need to be requested too.
The specific limits per GPU on GPU nodes will be eventually documented separately.
Users are expected to modify their submission scripts or methods accordingly.
This change is driven by our efforts to update the HPC resource billing mechanism to comply with NHR HPC directives.
NHR requires that computing projects apply for CPU and GPU resources independently.
NHR also requires that HPC Centers track the use of these CPU and GPU resources.
The independent resources are then accounted for by Slurm jobs within our CLAIX nodes.
Therefore CPU nodes will only track CPUs (and equivalent memory) and GPU nodes will only track GPUs used.
The quota tools will eventually reflect this too.
