[one-users] VM is always using a single CPU

[Ondrej Hamada]

Hi Olivier,
as far as I know, the CPU attribute in One is used by scheduler only in order to decide how much CPU is consumed on hosts. It has no effect on VM unless you are using cgroups.
The vCPU sets how many threads could be used by the VM. The number of vCPU in Nebula determines the number of sockets in '-smp' option of KVM.

Ad setting number of CPU:
Let's look on following example: my hypervisor has two quad-core CPUs with hyperthreadig giving me 16 threads in total. In such case Nebula presents the CPU value of 1600 for the hypervisor. Now I decide that I do not want to run more than 20 VMs on such hyperviso, so 1600/20=80. But because Nebula divides these values by 100, you get 80/100 = 0.8. So if you want to run no more than 20 VMs on 16 threads, you shoud set the CPU value of the templates to 0.8.

Ondra

On 08/01/2014 05:07 PM, Olivier Sallou wrote:

On 08/01/2014 03:44 PM, Steffen Claus wrote:
Did you configure the value for "vCPU" as well?
It was not set at all.
Adding it indeed add some core to the VM, but this is a little misleading....

But should CPU be equal to VCPU for full CPU usage? (I want to really use 2 cores => CPU = 2, VCPU = 2)

Thanks

________________________________
Hi,
I have an issue with CPUs, all my VMs have a single CPU whatever is set in my sunstone template.

Executed command is:
/usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 ....


while in my template in sunstone I see :
CPU     2
I expect to have here 2 CPUs.

The generated deployment file is below:

<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
    <name>one-984</name>
    <cputune>
        <shares>2048</shares>
    </cputune>
    <memory>2097152</memory>
    <os>
        <type arch='x86_64'>hvm</type>
        <boot dev='hd'/>
    </os>
    <devices>
        <emulator>/usr/bin/kvm</emulator>
        <disk type='file' device='disk'>
            <source file='/var/lib/one//datastores/0/984/disk.0'/>
            <target dev='vda'/>
            <driver name='qemu' type='raw' cache='none'/>
        </disk>
        <disk type='file' device='cdrom'>
            <source file='/var/lib/one//datastores/0/984/disk.1'/>
            <target dev='hda'/>
            <readonly/>
            <driver name='qemu' type='raw'/>
        </disk>
        <interface type='bridge'>
            <source bridge='br0'/>
            <mac address='00:04:c0:a8:02:40'/>
        </interface>
        <graphics type='vnc' listen='0.0.0.0' port='6884' keymap='fr'/>
    </devices>
    <features>
        <acpi/>
    </features>
</domain>



Could you explain what is wrong ?

I am using OpenNebula 4.2  (expecting an upgrade soon...)

Thanks

Olivier

--


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--
Steffen Claus

Fraunhofer-Institut für Algorithmen und Wissenschaftliches Rechnen (SCAI)
Schloss Birlinghoven
D-53754 Sankt Augustin
Tel: +49 2241 14-2511
steffen.claus at scai.fraunhofer.de<mailto:steffen.claus at scai.fraunhofer.de>
http://www.scai.fraunhofer.de


--
Olivier Sallou
IRISA / University of Rennes 1
Campus de Beaulieu, 35000 RENNES - FRANCE
Tel: 02.99.84.71.95

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Key fingerprint = 5FB4 6F83 D3B9 5204 6335  D26D 78DC 68DB 326D 8438





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