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Comparison of Distributed Operating Systems

Comparison of Distributed Operating Systems. Systems Discussed. Plan 9 AgentOS Clouds E1 MOSIX. Plan9 - 1. History Bell Labs 1984 – 2002 (and on) “Plan 9 from Bell Labs” based on “Plan 9 from Outer Space.” Replaced Unix as primary research platform. Based on 9P protocol.

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Comparison of Distributed Operating Systems

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  1. Comparison of Distributed Operating Systems

  2. Systems Discussed • Plan 9 • AgentOS • Clouds • E1 • MOSIX

  3. Plan9 - 1 • History • Bell Labs 1984 – 2002 (and on) • “Plan 9 from Bell Labs” based on “Plan 9 from Outer Space.” • Replaced Unix as primary research platform. • Based on 9P protocol. • Accesses all resources, local and remote.

  4. Plan9 - 2 • Notable architecture: • All system interfaces through file system. (pre-Linux) • Workstation - independent working environment • “Workstation” – aggregated resources, remote and local.

  5. Plan9 - 3 • /proc • All processes are visible as files • /net • All network traffic read/written through file system • Can import posix apps, emulate Berkeley socket interface through APE (ANSI/POSIX Environment)

  6. AgentOS - 1 • Originally designed by Harry Chen at UC, Irvine (1998) • Subsumed by The Bio-Networking Architecture project • Grants from NSF, DARPA, and AFOSR(Air Force Office of Scientific Research)

  7. AgentOS - 2 • Goal: Ubiquitous Access • Nomadic and mobile users • Based on Java VM • Agent based vs. RPC • Adaptive vs. dummy communication • Byte code inefficiency • Just In Time Compilers with caching

  8. Clouds - 1 • History • Clouds is actually 2 separate operating systems • Clouds V1, based on VAX kernel 1986 • Clouds V2, based on Ra kernel ~1989 • Purpose • Support distributed research at Georgia Institute of Technology

  9. Clouds - 2 • Clouds based on the object/thread paradigm • At OS level there is only one type of object, clouds • Ra kernel implements persistent virtual memory • Threads travel through objects • Entry points

  10. E1 • E1 first distributed commercially in 2005. • Very much like clouds • Object/thread paradigm • Difference: Threads outside of objects • Objects replicated and synchronized • Redundancy vs. loss of efficiency in replication

  11. MOSIX - 1 • Version 0 (1977) – research project on process migration • based on Unix 6 • tested on PDP 11/45 and diskless 11/10 connected by parallel I/O • Named: UNIX with satellite processors. • Current Version, 10 (2006) [MOSIX2] • Supporting Linux Kernel 2.6 • Generic Solution – dynamic management of resources.

  12. MOSIX - 2 • Core – • adaptive sharing algorithms • Preemptive process migration • Load balancing • Process placement • System structure • Compatibility: • Connect with any Linux, only one MOSIX hub required

  13. MOSIX - 3 • Cluster – collection of computers • Grid – collection of clusters • Partition • Limited to 256 nodes (by IP addressing) • Highly secure • Infinitely scalable

  14. Impact on Current Systems • Impact on current systems • Plan9 file system in Linux • Clouds RPC model in later UNIX and windows • AgentOS theory behind Google Docs

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