gpu驱动持久化及nvlink检查

转载：

https://blog.csdn.net/weixin_54757969/article/details/131960450

操作系统及NVlink桥接及gpu驱动持久化

我最熟悉的linux操作系统是Ubuntu，起初想装23.04，它的内核是6.2。最终选择了装Ubuntu22.04，考虑就是这个版本支持较好。基本上所有的支持linux软件，都有Ubuntu22.04的安装方法。我没装server版，直接上了桌面版本，显卡驱动版本530.41.03。（注：后来我为了安装cuda11.7.1及cudnn8.6，把驱动降至515.65.01,2023.7.26）

然后是让NVlink工作，需要开启驱动持久化模式：

1
2
3

nvidia-smi -pm 1
sudo reboot

检查方法：

nvidia-smi topo -m

	GPU0	GPU1	CPU Affinity	NUMA Affinity
GPU0	 X 	NV4	0-23		N/A
GPU1	NV4	 X 	0-23		N/A

这里有一个事项要说明，NVlink插好时，会发现咔哒一声。起初我插完后，持久化重启，用检查命令查不到nvlink工作。后来断电关机，重新插了一次NVlink，听到咔哒一声。然后再开机，一切正常了。测试一下桥接速度，不知道为何14GB，快吗？

allonx@x299:~/qmx_projects/langchain-ChatGLM$ nvidia-smi nvlink -s
GPU 0: NVIDIA GeForce RTX 3090 (UUID: GPU-9cca89b5-8627-6cff-7cb4-d8fae8dfadbe)
	 Link 0: 14.062 GB/s
	 Link 1: 14.062 GB/s
	 Link 2: 14.062 GB/s
	 Link 3: 14.062 GB/s
GPU 1: NVIDIA GeForce RTX 3090 (UUID: GPU-f3fc3749-f793-189f-b592-5af6bb39a569)
	 Link 0: 14.062 GB/s
	 Link 1: 14.062 GB/s
	 Link 2: 14.062 GB/s
	 Link 3: 14.062 GB/s

再查一下详细情况：

allonx@x299:~/qmx_projects/langchain-ChatGLM$ nvidia-smi nvlink -c
GPU 0: NVIDIA GeForce RTX 3090 (UUID: GPU-9cca89b5-8627-6cff-7cb4-d8fae8dfadbe)
	 Link 0, P2P is supported: true
	 Link 0, Access to system memory supported: true
	 Link 0, P2P atomics supported: true
	 Link 0, System memory atomics supported: true
	 Link 0, SLI is supported: true
	 Link 0, Link is supported: false
	 Link 1, P2P is supported: true
	 Link 1, Access to system memory supported: true
	 Link 1, P2P atomics supported: true
	 Link 1, System memory atomics supported: true
	 Link 1, SLI is supported: true
	 Link 1, Link is supported: false
	 Link 2, P2P is supported: true
	 Link 2, Access to system memory supported: true
	 Link 2, P2P atomics supported: true
	 Link 2, System memory atomics supported: true
	 Link 2, SLI is supported: true
	 Link 2, Link is supported: false
	 Link 3, P2P is supported: true
	 Link 3, Access to system memory supported: true
	 Link 3, P2P atomics supported: true
	 Link 3, System memory atomics supported: true
	 Link 3, SLI is supported: true
	 Link 3, Link is supported: false
GPU 1: NVIDIA GeForce RTX 3090 (UUID: GPU-f3fc3749-f793-189f-b592-5af6bb39a569)
	 Link 0, P2P is supported: true
	 Link 0, Access to system memory supported: true
	 Link 0, P2P atomics supported: true
	 Link 0, System memory atomics supported: true
	 Link 0, SLI is supported: true
	 Link 0, Link is supported: false
	 Link 1, P2P is supported: true
	 Link 1, Access to system memory supported: true
	 Link 1, P2P atomics supported: true
	 Link 1, System memory atomics supported: true
	 Link 1, SLI is supported: true
	 Link 1, Link is supported: false
	 Link 2, P2P is supported: true
	 Link 2, Access to system memory supported: true
	 Link 2, P2P atomics supported: true
	 Link 2, System memory atomics supported: true
	 Link 2, SLI is supported: true
	 Link 2, Link is supported: false
	 Link 3, P2P is supported: true
	 Link 3, Access to system memory supported: true
	 Link 3, P2P atomics supported: true
	 Link 3, System memory atomics supported: true
	 Link 3, SLI is supported: true
	 Link 3, Link is supported: false

其中有提示“Link is supported: false”，不明就里，上网查了一下，有一个人与我一样的情况，回复说是正常。

总体来说，这个主机方案接近完美，为了省钱，我没选择水冷，采用了经济实惠的风冷方案。

装机之后，我先装了一个windows系统测试。可能是这块主板有些古老（2017年生产），试了几次我都没法成功安装win11，只能安装win10。用cup-z、gpu-z、鲁大师、3dmark都进行了测试。也许是华硕tuf 3090都这样，3dmark稳定度测试最高都只达到97%-98%之间，算是勉强通过了测试。

另有一个小小的缺憾，就是这台工作站的主机上面缺少了档板，不知道是不是长期运行主机会进入大量灰尘。而且x299 gaming7的档板很难配，偶尔有卖的，一块档板竟要价近300元。实在没必要。