![]() ![]() Comparison of platform virtualization software. Platform virtualization software, specifically emulators and hypervisors, are software packages that emulate the whole physical computer machine, often providing multiple virtual machines on one physical platform. The table below compares basic information about platform virtualization hypervisors. General. Without Oracle support: Linux, Free. BSDProprietary. OVPsim. OVP . VM/ESA running in z/VM 4. VM 5. 2 in z/VM 5. Linux on z. Series, z/OS, z/VSE, z/TPF, z/VM, VM/CMS, MUSIC/SP, Open. Solaris for System z, predecessors. Proprietaryz LPARs. IBMz/Architecturez/Architecture. Integrated in firmware of System z mainframes. ![]() ![]() Freeware Files.com - Download free Virtual CD/DVD, hard drive programs. ![]() Linux on z. Series, z/OS, z/VSE, z/TPF, z/VM, MUSIC/SP, and predecessors. Integrated in firmware of System z mainframes. Name. Creator. Host CPUGuest CPUHost OS(s)Guest OS(s)License. Features. Runs at near- native speeds for x. VT- x, cross- simulation of other architectures can be faster or slower than real- time depending on how fast the target is and how big the target is (number of processors, number of target machines, and how much the simulation can be parallelized)Yes. Sun x. VM Server. ![]() ![]() Yes. Yes. Yes. Paravirtualization and porting or hardware virtualization. Servers, Development. Up to near native. Xen powers most public cloud services and many hosting services, such as Amazon Web Services, Rackspace Hosting and Linode. Up to native. Xen powers most public cloud services and many hosting services, such as Amazon Web Services, Rackspace Hosting and Linode. Up to native. Native usually means that the virtualization technique does not do any CPU level virtualization (like Bochs), which executes code more slowly than when it is directly executed by a CPU. Some other products such as VMWare and Virtual PC use similar approaches to Bochs and QEMU, however they use a number of advanced techniques to shortcut most of the calls directly to the CPU (similar to the process that JIT compiler uses) to bring the speed to near native in most cases. However, some products such as co. Linux, Xen, z/VM (in real mode) do not suffer the cost of CPU- level slowdowns as the CPU- level instructions are not proxied or executing against an emulated architecture since the guest OS or hardware is providing the environment for the applications to run under. However access to many of the other resources on the system, such as devices and memory may be proxied or emulated in order to broker those shared services out to all the guests, which may cause some slow downs as compared to running outside of virtualization.^ OS- level virtualization is described as . ![]() TheINQUIRER publishes daily news, reviews on the latest gadgets and devices, and INQdepth articles for tech buffs and hobbyists.Xen) with OS- level virtualization^ Requires patches/recompiling.^ Exceptional for lightweight, paravirtualized, single- user VM/CMS interactive shell: largest customers run several thousand users on even single prior models. For multiprogramming OSes like Linux on z. Series and z/OS that make heavy use of native supervisor state instructions, performance will vary depending on nature of workload but is near native. Hundreds into the low thousands of Linux guests are possible on a single machine for certain workloads. Image type compatibility. For example, a VM with 1 TB of memory cannot fit in a host with only 8 GB memory and no memory swap disk, so it will have a limit of 8 GB physically.
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