[ovirt-users] Need some help understanding memory allocation

[Fabrice Bacchella]

What does /proc/meminfo says ?

Memory usage is a complex thing.

> Le 10 août 2017 à 23:23, Wesley Stewart <wstewart3 at gmail.com> a écrit :
> 
> I am a little confused on why my CentOS box is using so much RAM.  I currently have a small test setup which only has 12GB of ram total.
> 
> When I log into the administrative interface it tells me:
> 
> Memory
> 
> 4.3
> Available
> of 15.5 GiB 
> Over commit: 39% (allocated 45%)
> 
> 11.1 GB Used
> 
> Currently I am only running 3 VMs with memory allocations as follows:
> 
> Defined Memory:
> 1024 MB
> Physical Memory Guaranteed:
> 1024 MB
> 
> Defined Memory:
> 3072 MB
> Physical Memory Guaranteed:
> 3072 MB
> 
> Defined Memory:
> 2048 MB
> Physical Memory Guaranteed:
> 2048 MB
> Or 6144MB used by VM
> 
> If I SSH into my ovirt host, and run TOP and sort by memory, the top usage items are:
> 31896 qemu      21.5% 727:21.44 qemu-kvm
>  6008 qemu        14.6% 190:33.70 qemu-kvm
>  3019 ovirt            13.6%  35:47.64 java
>  5800 qemu         8.5% 784:26.88 qemu-kvm
>  2565 ovirt            3.9%  62:58.00 java
> 
> Everything else is pretty small compared, but for the OVIRT/QEMU we roughly get
> Total: 62% = 7.45GB
> 
> So I am a bit confused as to the Ram being reported to me by the system (15.5GGB, but the system only has 12GB), and assuming OVIRT is using around 7-8GB, does a bare minimal install of CentOS really need 4-5GB of Ram to run?
> 
> This is a bare minimal install of CentOS7 running only Webmin and oVirt.  I think there are several things I don't understand here, and I am quite new to oVirt and would like to learn, so please excuse my inexperience if this is a silly question!
> 
> Thanks either way, I am really happy I ditched my ESXi box :D
> 
> 
> 
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