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Adds bandwidth.yml playbook for NVIDIA nvbandwidth #834

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Adds bandwidth.yml playbook for NVIDIA nvbandwidth #834

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cc61ed3
Adds bandwidth.yml playbook to download, build, and run nvbandwidth.
claudia-lola Oct 22, 2025
abb3185
Adds bandwidth.yml playbook for NVIDIA nvbandwidth and
claudia-lola Oct 28, 2025
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7 changes: 4 additions & 3 deletions ansible/adhoc/cudatests.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,9 @@
- hosts: cuda
become: true
gather_facts: true
tags: cuda_samples
tags: cuda_bandwidth
tasks:
- ansible.builtin.import_role:
- name: Run CUDA bandwidth tasks
ansible.builtin.import_role:
name: cuda
tasks_from: samples.yml
tasks_from: bandwidth.yml
4 changes: 4 additions & 0 deletions ansible/roles/cuda/defaults/main.yml
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Expand Up @@ -16,3 +16,7 @@ cuda_samples_programs:
- bandwidthTest
# cuda_devices: # discovered from deviceQuery run
cuda_persistenced_state: started
# variables for nvbandwidth (for bandwidth.yml tasks run in cudatests.yml)
cuda_bandwidth_version: 'v0.8'
cuda_bandwidth_path: "/var/lib/{{ ansible_user }}/cuda_bandwidth"
cuda_bandwidth_release_url: "https://github.com/NVIDIA/nvbandwidth/archive/refs/tags/{{ cuda_bandwidth_version }}.tar.gz"
58 changes: 58 additions & 0 deletions ansible/roles/cuda/tasks/bandwidth.yml
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@@ -0,0 +1,58 @@
---
- name: Ensure CUDA bandwidth path exists
ansible.builtin.file:
state: directory
path: "{{ cuda_bandwidth_path }}"
owner: "{{ ansible_user }}"
group: "{{ ansible_user }}"
mode: "0755"

- name: Download CUDA bandwith test release
ansible.builtin.unarchive:
remote_src: true
src: "{{ cuda_bandwidth_release_url }}"
dest: "{{ cuda_bandwidth_path }}"
owner: "{{ ansible_user }}"
group: "{{ ansible_user }}"
creates: "{{ cuda_bandwidth_path }}/nvbandwidth-0.8"

- name: Creates CUDA bandwidth test build directory
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Can you make the name: consistent with the name: on the first task please?

ansible.builtin.file:
state: directory
path: "{{ cuda_bandwidth_path }}/nvbandwidth-0.8/build"
mode: "0755"

- name: Ensure cudatests directory exists
ansible.builtin.file:
path: "{{ appliances_environment_root }}/cudatests"
state: directory
mode: '0755'
delegate_to: localhost

- name: Build CUDA bandwidth test
ansible.builtin.shell:
cmd: >
source /cvmfs/software.eessi.io/versions/2023.06/init/bash &&
module load buildenv/default-foss-2023b &&
module load Boost/1.82.0-GCC-12.3.0 &&
. /etc/profile.d/sh.local &&
cmake .. &&
make -j {{ ansible_processor_vcpus }}
chdir: "{{ cuda_bandwidth_path }}/nvbandwidth-0.8/build"
creates: "{{ cuda_bandwidth_path }}/nvbandwidth-0.8/build/nvbandwidth"
changed_when: true

- name: Run CUDA bandwidth test
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I think this needs changed_when: true to subdue the check error

ansible.builtin.shell: |
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So:

  1. Rather than using export you can use the environment keyword - docs
  2. Why do we have to mess with LD_LIBRARY_PATH?
  3. If we really do, this approach won't work b/c it is e.g. hardcoding the microarch (zen4), which will definitely break (e.g. when using an Intel processor), and versions, which doesn't seem robust.

Is it not sufficent to just activate eessi again? And maybe load some eeesi modules?

./nvbandwidth
args:
chdir: "{{ cuda_bandwidth_path }}/nvbandwidth-0.8/build/"
register: cuda_bandwidth_output
changed_when: true

- name: Save CUDA bandwidth output to bandwidth_results.txt
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Is there no useful summary we can do here?

ansible.builtin.copy:
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Given this is fetching a file, why does this not use ansible.builtin.fetch?

content: "{{ cuda_bandwidth_output.stdout }}"
dest: "{{ appliances_environment_root }}/cudatests/{{ inventory_hostname }}bandwidth_results.txt"
mode: '0644'
delegate_to: localhost
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