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Can't run Geekbench 6 on @TencentLighthouse 's promotional 1y 2vCPUs 2GB RAM VM
I got a 1-year 2vCPUs Linux VM for 10.08 USD/year [promotional pricing] with the following specs:
2vCPUs2GB, SSD 40GB, Peak Bandwidth 20M, Monthly Traffic 512GB
As listed at: https://www.tencentcloud.com/act/pro/lighthouse
It freezes the system every time I run Geekbench 6 on it. I have no way to do anything but reboot from their console. It won't even let me ssh login from another tab etc.
System information according to the Geekbench 6:
System Information
Operating System Debian GNU/Linux 13 (trixie)
Kernel Linux 6.12.94+deb13-amd64 x86_64
Model Tencent Cloud CVM
Motherboard N/A
BIOS SeaBIOS seabios-1.9.1-qemu-project.org
CPU Information
Name AMD EPYC 9754
Topology 1 Processor, 1 Core, 2 Threads
Identifier AuthenticAMD Family 25 Model 160 Stepping 2
Base Frequency 2.25 GHz
L1 Instruction Cache 64.0 KB
L1 Data Cache 64.0 KB
L2 Cache 512 KB
L3 Cache 256 MB
Instruction Sets sse2 sse3 pclmul fma3 sse41 aesni avx avx2 avx512-f avx512-dq shani avx512-bw avx512-vl vaes avx512-vnni
Memory Information
Size 1.90 GB
So, the CPU looks good to handle this.
Their support is prompt and replied as follows:
Upon checking the logs, we found that the CPU was running at 100% and the system eventually ran out of memory (OOM). The system subsequently killed the geekbench_avx2 business process.
Please note that severe memory shortages can cause excessive disk read operations, leading to I/O bottlenecks and system freezes.
We recommend:
1. Optimizing your application to reduce memory consumption, or
2. Upgrading to a higher-spec instance plan to accommodate your workload. https://www.tencentcloud.com/document/product/1103/41562
Of course a synthetic benchmark will peak the CPU to max for a while but it is the job of the hypervisor to throttle or control it? Isn't it? It should not just freeze, right? or am I wrong?
Can someone explain me why is this happening? I am running Debian 13.5 with no load like VPN, web servers etc. Just sshd server.
@TencentLighthouse Please look into this. Thank you!
Here is the results of @ddps 's 1core 2G RAM VM [1 Core less and same amount of RAM]:
https://browser.geekbench.com/v6/cpu/18569350
Comments
What did their support team say when you contacted them on their website?
I have included it in the post. Basically they want me to upgrade!
Could it be related to disk read operations? Or their hypervisor is not tuned to handle CPU burst loads?
Best Regards
Dont run it in a ssh session, put in a background session. Like; nohup yourbenchscript &
I never had to do this. How would this help please?
Maybe. If you run into a situation where the system doesn't have anything good to swap (assuming you have swap enabled of course) and starts endlessly juggling different chunks in and out of RAM (since it really needs all of them but can't fit everything into RAM at the same time) it's not going to be pretty and can basically feel like a hard lock even on bare metal. Add a virtualized disk shared with X other VMs and blasted cores...
Theoretically 2G should be plenty in my opinion but given how much senseless resource waste modern Linux installations regularly are i wouldn't be surprised if i'm wrong.
Is it the latest version of Geekbench 6? If I recall correctly, there were issues with the previous version of Geekbench 6 failing to run.
if memory and cpu is getting tight some processes (like your ssh session) can be killed by the kernel or hypervisor. If you want your benchmark to finish it shouldnt be run in a ssh session but in the background, so when the ssh session is killed, the child (your benchmark) session isnt killed too.
Yes and the same version ran here:
I have Ghost instance [tech blog], email server, authoritative DNS and what not running on it vs literally nothing on Tencent's VM.
The CPU supports sustained 100% utilization.
So, it worked now, all that was required is a GB of SWAP!!
It was literally running out of memory as I saw this time while doing the test with top running in a separate tab.
Results of 2vCPUs2GB AMD EPYC 9754 instance by @TencentLighthouse with GB6:
https://browser.geekbench.com/v6/cpu/18570622
vs 1vCPU2G AMD Ryzen 9 9900X instance by @ddps:
https://browser.geekbench.com/v6/cpu/18569350
AMD's Desktop CPUs are crazy good for servers? I had similar experience with @gigahost 's AMD Ryzen VMs.
Thank you but a GB of SWAP fixed it
Always add swap to low memory servers. Holy shit. What llm has to say about that?!
Since when 2GB is low for a VPS? They still do 512M VMs, don't they? Apparently 2G without swap is edgy situation if you want to do Geekbench. It may or may not run depending on the installation image.
Yeah, agreed. When you know what your workload requires you can pretty much skip swap. I have a 256mb VM running without swap no problems. I wouldn't try benching that sorry snail though
weird because 2GB physical ram should be enough. but anyway making a swap of 1 or 2 Gb is always handy on those low end chicken
It was almost enough, as only about 40-50M of SWAP was used during the test.
If I got to install Debian from scratch vs provider's image, chances are it would run well without the SWAP. It did on a VM hosted on a friend's server with R9 7900 1core 2GB
Nowadays 8GB DDR5 is normal. 2 and bellow is small plate chicken with no fries.
Does swap change a bit of benchmark, maybe 1-2%?