Deadlock detectionIf the system does not employ either a deadlock prevention or avoidance algorithm deadlock, the deadlock situation may occur. In this environment, the system must provide:* An algorithm that examines the state of the system to determine whether there has been a deadlock.
* An algorithm to recover from deadlock.If all resources have only one event, then we can define a deadlock detection algorithm which uses a variant of the...
Selasa, 19 Maret 2013
Deadlock avoidance
The caches guarantee that all incoming replies (REPLYs and
COHE_REPLYs) are accepted even if they require further messages to
be sent out. If a REPLY leads to a retry (either because of an RAR
or a NackUpgradeConflictReply), the MSHR originally allocated
by the REQUEST will be used as a resource from which to send
the message to the cache ports. If a REPLY leads to a writeback
or replacement message, its
write-back buffer...
VIRTUAL MEMORY1. The basic concept of virtual memory:Memory management is essentially putting all the parts of a process that will run into memory before the process is run. To that end, it's all part of the process should have its own place in the physical memory.But not all parts of the process will be run, for example:• Statement or the only option will be exercised in certain circumstances. Examples are: error messages only appear if an error...
Senin, 18 Maret 2013
Shortest Job First Algorithm
Shortest Job First (SJF) scheduling is a priority and Non Preventive. Non Preveentive mean here is when the allotted time a processor then the processor can not be taken the other, until the process is completed in the execution. This assumes scheduling time to complete the process known in advance. The mechanism is to...
Algorithm First Come First ServedAlgorithm First Come First Served (FCFS) is also called as the first technique Arriving First Served (PTPD). FCFS is no priority scheduling and without preempsi (see post cpu scheduling). Therefore, this process consists in the queue simultaneously pure.In FCFS, a process that arrives first will be served first. When it arrives at the same time, the services performed by the order they are in the queue. It does not...
DEFINITIONS DEFINITIONS InterruptThe process is performed by the microcontroller Interrupt Service RoutineInterrupt is an event or events that led to the microcontroller interrupt pause to serve them. Programs that run at interrupt minister called Interrupt Service Routine. The analogy is as follows, someone is typing reports, telephone suddenly rang...
Management Processes and ThreadsDefinition of ProcessThe process is a program being executed. According
to Silberschatz process is not just a program code (text section), but
includes several activities in question as the program counter and
stack. A
process also involves a stack that contains temporary data (parameters
of function / method, return address and local variables) and data
section that stores global variables. Tanenbaum
also believes...
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