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thesis was titled “Linux: A Portable Operating System” and ..
VMware ESX Server enables a physical computer to be available as a pool of secure virtual servers, on which operating systems can be run. This is an example of dynamic, logical partitioning. Moreover, ESX Server does not need a host operating system (like VMware workstation) - it runs directly on hardware (in that sense, it is the host operating system). ESX server was inspired by work on Disco and Cellular Disco, which virtualized shared memory multiprocessor servers to run multiple instances of IRIX. As mentioned earlier, the IA-32 architecture is not naturally virtualizable. Certain "sensitive" instructions must be handled by the VMM, and cannot be simply executed in non-privileged mode because they don't cause a General Protection exception. ESX Server solves this problem by dynamically rewriting portions of an operating system kernel's code to insert traps at appropriate places - in order to catch such sensitive instructions. ESX Server can run multiple virtual CPUs per physical CPU. Multiple physical network interface cards can be logically grouped into a single, high-capacity, virtual network device.
The base model 5150 came with only 16 kilobytes of RAM, but could be expanded to 640k using the expansion slots. Each 5 1/4 inch floppy drive held 360 kilobytes of information. My IBM 5150 was purchased for $61.50 in October 2004. It has only 64k of RAM. It is in generally good working and cosmetic condition, except the trim around the monitor is cracked. It has one floppy drive and a hard drive which currently does not work. It is running on PC DOS 2.1. It also boots to Microsoft Basic if DOS is not installed. My computer is apparently the post April 1983 version. As shown, it came with a DOS guide and a BASIC guide. The base model started at $1,600 but this was with no drives or monitor. As I recall in 1983 a decent setup with drives, monitor and printer was about $5,000!
thesis was titled Linux: A Portable Operating System
is an operating system that extends Linux to support quality of service. It was a result of joint work by the Universities of Massachusetts (Amherst) and Texas (Austin). QLinux includes a hierarchical start-time fair queueing (H-SFQ) CPU scheduler, an H-SFQ packet scheduler for network, the Cello disk scheduler, and Lazy Receiver Processing to incorporate fairer accounting of protocol processing overheads.
Programming languages are often implemented using virtual machines. Benefits of doing this include isolation (the virtual machine is a sandbox) and portability. The UCSD P-System was very popular in the 70s and the early 80s. It was a virtual machine running p-code (akin to bytecode), with UCSD PASCAL being the most popular programming language. The operating system itself was written in PASCAL.
to the detailed structure of the LINUX operating system and its ..
Hive is an internally distributed system consisting of multiple independent kernels, or cells. The idea is to improve reliability by containing faults within a cell, thus not affecting processes running on other cells. Each memory page in hive has a small write permission bitmap, which allows the system to discard corrupt page upon fault detection.
In light of the problem described above, ECLIPSE also included Signaled Receiver Processing (SRP) to alleviate a certain set of issues: protocol processing of received packets in BSD Unix is interrupt-driven and may cause scheduling anomalies that are unacceptable in systems that provide QoS guarantees. SRP is an alternate mechanism that generates a signal to the receiving process when a packet arrives. The default action of this signal is to perform protocol processing asynchronously. However, a receiving process may catch, block or ignore the signal and defer protocol processing until a subsequent receive call. In any case, protocol processing occurs in the context of the receiving process and is correctly charged. Therefore, SRP allows the system to enforce and honor QoS guarantees. Note that this is not the same as Lazy Receiver Processing (LRP).
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He started working on his thesis titled Linux: A Portable Operating
Other server families, such as the iSeries, and other IBM operating systems, such as OS/400, also support logical partitioning. There is a primary OS/400 partition, that loads a hypervisor (known as "the Hypervisor"), which provides partition control, mediation, and isolation. You can then have further OS/400 partitions, as well as Linux partitions.
Linux is a operating system that is referred to a ..
IBM's Logical Partitioning (LPAR) allows you to run multiple, independent operating system images of AIX and Linux on a single server (that supports such partitioning, such as the pSeries family). The minimum resources needed for a pSeries partition are: one processor, 256 MB memory, an I/O slot and its attached devices. The AIX Workload Manager (WLM) is used for resource management.
for maintaining Linux operating system configuration changes
IBM has a number of server offerings. The zSeries is IBM's mainframe range that can run operating systems such as z/OS, z/OS.e, z/VM, VSE/ESA, a transaction processing OS (TPF), and Linux. The iSeries are midrange servers running OS/400 and Linux. The pSeries exist in various ranges, and run AIX and Linux. There are other server solutions for clustering, storage, etc.
Unikernels: The Rise of the Virtual Library Operating System
While retrofitting QoS in an existing operating system (such as FreeBSD) is a good idea, one cannot deny that it cannot be perfect due to the architecture of the existing system. Typically you associate resource guarantees (or weights) with an execution context (say, a "domain", in which processes can run). One now needs to tag processes that belong to this domain, which is great except there is plenty of activity in the kernel that doesn't traditionally have access to process context. Modifying data structures to propagate the tags is unclean, and may break compatibility (say, because you changed the size of the structure). Thus, unless you design an operating system with QoS in mind, interactions in the system are complex enough that it is extremely difficult to charge all activity to its rightful owner.
Which parts of the Linux operating system did each provide
In 1998-99, I worked on the ECLIPSE operating system at Bell Labs. There was a great interest in Quality of Service then. ECLIPSE was derived from FreeBSD and included support both for quality of service (even for legacy applications), and a layer to manage it. ECLIPSE had fair-share schedulers for CPU, network, and disk. Protocols like NFS, WWW, and FTP were QoS aware. A pseudo filesystem (the reservation filesystem) was used to provide the user-level API for managing resources.
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