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z/VM is the current version in IBM's VM family of virtual machine operating systems. First released in October 2000, [ 2 ] z/VM remains in active use and development as of 2024 [update] . [ 3 ]
[citation needed] z/VM 4.4 was the last version that could run in ESA/390 mode; subsequent versions only run in z/Architecture mode. [ 12 ] The CMS in the name refers to the Conversational Monitor System, a component of the product that is a single-user operating system that runs in a virtual machine and provides conversational time-sharing in VM.
^ 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 IBM Z and z/OS that make heavy use of native supervisor state instructions, performance will vary depending on nature of workload but is near native.
The application program interfaces of IBM's mainframe operating systems is defined as a set of assembly language "macro" instructions, that typically invoke Supervisor Call (SVC) [e.g., on z/OS] or Diagnose (DIAG) [on, e.g., z/VM] instructions to invoke operating system routines. It is possible to use operating system services from programs ...
It took some time for a single OS to fully utilize the z990, as the z/OS and z/VM only gained support for 24 processors in September 2004, and for 32 processors in June 2005 for the z/OS and June 2007 for the z/VM. [45] [46] In May 2004, the z800 was succeeded by the z890. The memory capacity and the core count were left unchanged from the z800 ...
But the company's well-known reputation for preferring proven technology has generally given potential users the confidence to adopt new IBM systems fairly quickly. IBM's current mainframe operating systems, z/OS, z/VM, z/VSE, and z/TPF, are backward compatible successors to those introduced in the 1960s.