======GPU Nodes on Lengau======


The Lengau cluster at the CHPC includes 9 GPU compute nodes with a total of 30 Nvidia V100 GPU devices.  There are 6 ''gpu200''//n// nodes with 3 GPUs in each, and 3 ''gpu400''//n// nodes with 4 GPUs in each.


^  GPU Node  ^  CPU Cores  ^  GPU Devices  ^  Interface  ^
| ''gpu2001''  |  36 | 3× Nvidia V100 16GB  | PCIe  |
| ''gpu2002''  |  36 | 3× Nvidia V100 16GB  | PCIe  |
| ''gpu2003''  |  36 | 3× Nvidia V100 16GB  | PCIe  |
| ''gpu2004''  |  36 | 3× Nvidia V100 16GB  | PCIe  |
| ''gpu2005''  |  36 | 3× Nvidia V100 **32GB**  | PCIe  |
| ''gpu2006''  |  36 | 3× Nvidia V100 **32GB**  | PCIe  |
| ''gpu4001''  |  40 | 4× Nvidia V100 16GB  | **NVlink**  |
| ''gpu4002''  |  40 | 4× Nvidia V100 16GB  | **NVlink**  |
| ''gpu4003''  |  40 | 4× Nvidia V100 16GB  | **NVlink**  |

> Jobs that require 1, 2 or 3 GPUs can be allocated to any node, and will share the node if the job does not use all the GPU devices on that node.  Jobs that require 4 GPUs can only be allocated to ''gpu4*'' nodes and will not be shared, obviously.

> The GPU nodes have 192GiB so a job script that requests an entire node could access approximately 188GiB (the operating system needs about 4GiB).





=====Policies=====

====Access====

Access to the GPU nodes is by PI application only through the CHPC [[https://users.chpc.ac.za/helpdesk/|Helpdesk]].

[[guide:gpu|More information...]]