What is CPU topology?

What is CPU topology?

In this context, CPU topology refers to the number of sockets, cores per socket and threads per core for a given guest VM. Up until this point, when you requested an n vCPU VM through OpenStack, the resulting VM would be created with a CPU topology of n sockets, each with one single-thread core.

What is the use of virt-manager?

virt-manager , also known as Virtual Machine Manager, is a graphical tool for creating and managing guest virtual machines. Start virt-manager . Launch the Virtual Machine Manager application from the Applications menu and System Tools submenu. Alternatively, run the virt-manager command as root.

Is virt-manager better than virtualbox?

libvirt/qemu/kvm is much better. IMO, virtualbox has fallen behind everything else and has taken a step back since version 6. The only advantages virtualbox has in my experience are: Slightly better host/guest integration depending on which features you need.

What is qemu virtual CPU?

QEMU is a free and open-source emulator. It emulates the machine’s processor through dynamic binary translation and provides a set of different hardware and device models for the machine, enabling it to run a variety of guest operating systems.

What is NUMA and CPU pinning?

The NUMA topology and CPU pinning features in OpenStack provide high-level control over how instances run on hypervisor CPUs and the topology of virtual CPUs available to instances. These features help minimize latency and maximize performance.

What is NUMA node CPU?

NUMA is an alternative approach that links several small, cost-effective nodes using a high-performance connection. Each node contains processors and memory, much like a small SMP system. However, an advanced memory controller allows a node to use memory on all other nodes, creating a single system image.

What does virt mean?

the virtual size of a process
VIRT stands for the virtual size of a process, which is the sum of memory it is actually using, memory it has mapped into itself (for instance the video card’s RAM for the X server), files on disk that have been mapped into it (most notably shared libraries), and memory shared with other processes.

Where is virt-manager?

/var/log/libvirt/qemu
Log files for QEMU running under libvirt or virt-manager are found in /var/log/libvirt/qemu .

What is virt-manager Linux?

The virt-manager application is a desktop user interface for managing virtual machines through libvirt. It primarily targets KVM VMs, but also manages Xen and LXC (linux containers). It presents a summary view of running domains, their live performance & resource utilization statistics.

What is the purpose of QEMU?

Qemu is a machine emulator that can run operating systems and programs for one machine on a different machine. Mostly it is not used as emulator but as virtualizer in collaboration with KVM kernel components. In that case it utilizes the virtualization technology of the hardware to virtualize guests.

Is QEMU safe?

QEMU is a fast processor emulator using dynamic translation to achieve good emulation speed. It is a free open-source alternative to VMware. As QEMU requires no host kernel patches to run, it is very safe and easy to use.

Why do you need CPU pinning?

Processor affinity or CPU pinning enables applications to bind or unbind a process or a thread to a specific core or to a range of cores or CPUs. The operating system ensures that a given thread executes only on the assigned core(s) or CPU(s) each time it is scheduled, if it was pinned to a core.

Is NUMA node a socket?

A socket can contain one or more NUMA nodes with its cores and memory. A NUMA node will contain a set of cores and threads and memory which is local to the NUMA node. A core may have 0 or more threads. A socket refers to the physical location where a processor package plugs into a motherboard.

What is NUMA topology?

Non-uniform memory access (NUMA) NUMA is a derivative of the SMP design that is found in many multi-socket systems. In a NUMA system, system memory is divided into cells or nodes that are associated with particular CPUs. Requests for memory on other nodes are possible through an interconnect bus.

What is NUMA and vNUMA?

Under NUMA, a processor can access its own local memory faster than non-local memory, that is, memory local to another processor or memory shared between processors. Now what is vNUMA? vNUMA removes the transparency between the VM and the OS and presents the NUMA architecture directly to the VM’s operating system.

What does Virt mean in top command?

VIRT stands for the virtual size of a process, which is the sum of memory it is actually using, memory it has mapped into itself (for instance the video card’s RAM for the X server), files on disk that have been mapped into it (most notably shared libraries), and memory shared with other processes.

Where does virt-manager store connections?

The default location for most uses of virt-manager is /var/lib/libvirt/images , which is created by libvirt and has the expected selinux labelling and permission to run QEMU/KVM VMs. Behind the scenes, virt-manager is using a libvirt storage pool for creating disk images.