21. + 24. P2P (21.4.+28.4.) - ole unibz
... • Special case: peer with the file located behind a firewall/NAT gateway the downloading peer – cannot initiate a TCP/HTTP connection • can instead send the PUSH message asking the other peer to initiate a TCP/HTTP connection to it and then transfer (push) the file via it • does not work if both pee ...
... • Special case: peer with the file located behind a firewall/NAT gateway the downloading peer – cannot initiate a TCP/HTTP connection • can instead send the PUSH message asking the other peer to initiate a TCP/HTTP connection to it and then transfer (push) the file via it • does not work if both pee ...
Operating Systems, 082
... Processes - a key concept Resource container for “program in execution” Timesharing, process suspension/preemption Process Table Process Groups Signals ...
... Processes - a key concept Resource container for “program in execution” Timesharing, process suspension/preemption Process Table Process Groups Signals ...
Harshita Deshpande - Computer Science
... WebOS provides OS services to wide-area applications, including mechanisms for resource discovery, a global namespace, remote process execution, resource management, authentication, and security. On a single machine, application developers can rely on the local operating system to provide these abst ...
... WebOS provides OS services to wide-area applications, including mechanisms for resource discovery, a global namespace, remote process execution, resource management, authentication, and security. On a single machine, application developers can rely on the local operating system to provide these abst ...
General-Purpose Timing: The Failure of Periodic Timers
... which goes to sleep between successive operations (frames display) while leaving the system idle (and therefore opportunity-less) in between. A basic OS principle suggested by Finkel is that events at a high level are actually polling at a lower level [4]. For over 30 years OSs have used polling. It ...
... which goes to sleep between successive operations (frames display) while leaving the system idle (and therefore opportunity-less) in between. A basic OS principle suggested by Finkel is that events at a high level are actually polling at a lower level [4]. For over 30 years OSs have used polling. It ...
Yield Dave Eckhardt 1
... save registers on stack tcb->sp = &localvar; tcb->pc = &there; tcb = findtcb(user-thread-3); stackpointer = tcb->sp; /* asm(...) */ jump(tcb->pc); /* asm(...) */ ...
... save registers on stack tcb->sp = &localvar; tcb->pc = &there; tcb = findtcb(user-thread-3); stackpointer = tcb->sp; /* asm(...) */ jump(tcb->pc); /* asm(...) */ ...
NFV_SDN - Computer Networks
... • Optimize traffic across multiple infrastructures • Ensure service level agreement (SLA) compliance • Load balance between functions for optimal application performance ...
... • Optimize traffic across multiple infrastructures • Ensure service level agreement (SLA) compliance • Load balance between functions for optimal application performance ...
Emulating an Embedded Firewall Clifford Neuman, Deepak Dayama, and Arun Viswanathan
... We were provided with an initial version of the rule set language used by the Adventium Labs conversation manager for representing permitted communication through their embedded firewall. In the initial version, EFW rules were retrieved and in most cases, the firewall policies were readily converted ...
... We were provided with an initial version of the rule set language used by the Adventium Labs conversation manager for representing permitted communication through their embedded firewall. In the initial version, EFW rules were retrieved and in most cases, the firewall policies were readily converted ...
Dynamic Reconfiguration of Network Applications and Middleware
... amount, and unit cost of resources (e.g. CPU cycles and memory space) available on both a local and neighboring platforms. Each platform determines the unit cost of resources provided on that platform based on their availability. Cyber-entities have their own policies for each behavior. Each behavio ...
... amount, and unit cost of resources (e.g. CPU cycles and memory space) available on both a local and neighboring platforms. Each platform determines the unit cost of resources provided on that platform based on their availability. Cyber-entities have their own policies for each behavior. Each behavio ...
Chapter 2 Computer-System Structures 2
... interrupt vector and the interrupt service routines. • In order to have memory protection, add two registers that determine the range of legal addresses a program may access: – base register – holds the smallest legal physical memory address. – Limit register – contains the size of the range ...
... interrupt vector and the interrupt service routines. • In order to have memory protection, add two registers that determine the range of legal addresses a program may access: – base register – holds the smallest legal physical memory address. – Limit register – contains the size of the range ...
Processes
... – Processes can communicate only if they share a mailbox • Properties of communication link – Link established only if processes share a common mailbox – A link may be associated with many processes – Each pair of processes may share several communication links – Link may be unidirectional or bi-dir ...
... – Processes can communicate only if they share a mailbox • Properties of communication link – Link established only if processes share a common mailbox – A link may be associated with many processes – Each pair of processes may share several communication links – Link may be unidirectional or bi-dir ...
ppt
... Communications may be via shared memory or through message passing (packets moved by the OS) ...
... Communications may be via shared memory or through message passing (packets moved by the OS) ...
pdf
... So, multi-threading is useful even on a uni processor. But, threads, even when supported separately from processes in the kernel, are too slow. ...
... So, multi-threading is useful even on a uni processor. But, threads, even when supported separately from processes in the kernel, are too slow. ...
architectural study of littoral zone sensing using
... 1) Does not mention about maintaining and managing the cluster with respect to node mobility. 2) Large number of message passing between CHs and nodes. 3) Silent about how cluster is formed. 2.5 Scalable Localization with Mobility Prediction Architecture This architecture [4] is developed with the h ...
... 1) Does not mention about maintaining and managing the cluster with respect to node mobility. 2) Large number of message passing between CHs and nodes. 3) Silent about how cluster is formed. 2.5 Scalable Localization with Mobility Prediction Architecture This architecture [4] is developed with the h ...
powerpoint 97
... – via clusters of network-attached, computationallyenhanced storage nodes running distributed code – via hardware and software introspection – we are currently performing application studies to investigate and compare techniques ...
... – via clusters of network-attached, computationallyenhanced storage nodes running distributed code – via hardware and software introspection – we are currently performing application studies to investigate and compare techniques ...
W_Chapter_6
... • If a kernel-level thread is blocked, then all user-level threads assigned to it are also prevented from running. ...
... • If a kernel-level thread is blocked, then all user-level threads assigned to it are also prevented from running. ...
Monitoring, Alerting, DevOps, SLAs, and all that
... • Only alert on critical conditions – e.g. don’t email on a network port going dark (node reboot) – e.g. don’t email on a single disk failure in a RAID6 pool ...
... • Only alert on critical conditions – e.g. don’t email on a network port going dark (node reboot) – e.g. don’t email on a single disk failure in a RAID6 pool ...
Kernel Modules - Northern Kentucky University
... Which goal is most important? Depends on the target audience: Desktop: interactivity But kernel shouldn’t spend all its time in context switch. ...
... Which goal is most important? Depends on the target audience: Desktop: interactivity But kernel shouldn’t spend all its time in context switch. ...
Scheduling
... Which goal is most important? Depends on the target audience: Desktop: interactivity But kernel shouldn’t spend all its time in context switch. ...
... Which goal is most important? Depends on the target audience: Desktop: interactivity But kernel shouldn’t spend all its time in context switch. ...
Processes
... Part two: Process management A process can be thought of as a program in execution. ...
... Part two: Process management A process can be thought of as a program in execution. ...
Slide 1
... 2x2 subgraphs into supernodes Now we have 4 edges sticking out of each supernode 4-regular random graph! ...
... 2x2 subgraphs into supernodes Now we have 4 edges sticking out of each supernode 4-regular random graph! ...
pdf
... During the week of IEEE Infocom 2005, we distributed 50 iMotes (“intel motes”, which may be compared to the Berkeley Mote, and which contain a small processor, RAM and Bluetooth communication support) to a group of students attending the conference. Participants may be spanned across different socia ...
... During the week of IEEE Infocom 2005, we distributed 50 iMotes (“intel motes”, which may be compared to the Berkeley Mote, and which contain a small processor, RAM and Bluetooth communication support) to a group of students attending the conference. Participants may be spanned across different socia ...
Distributed operating system
A distributed operating system is a software over a collection of independent, networked, communicating, and physically separate computational nodes. Each individual node holds a specific software subset of the global aggregate operating system. Each subset is a composite of two distinct service provisioners. The first is a ubiquitous minimal kernel, or microkernel, that directly controls that node’s hardware. Second is a higher-level collection of system management components that coordinate the node's individual and collaborative activities. These components abstract microkernel functions and support user applications.The microkernel and the management components collection work together. They support the system’s goal of integrating multiple resources and processing functionality into an efficient and stable system. This seamless integration of individual nodes into a global system is referred to as transparency, or single system image; describing the illusion provided to users of the global system’s appearance as a single computational entity.