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Topic: Resource starvation


In the News (Fri 17 Feb 12)

  
  Resource starvation - Wikipedia, the free encyclopedia
Starvation occurs when one program holds resources the other needs, but is unwilling to give them up.
Starvation is illustrated by Edsger Dijkstra's dining philosophers problem.
The scheduling algorithm, which is part of the kernel, is supposed to allocate resources equitably; that is, the algorithm should allocate resources so that no process perpetually lacks necessary resources.
en.wikipedia.org /wiki/Resource_starvation   (129 words)

  
 Starvation - Open Encyclopedia   (Site not responding. Last check: 2007-10-09)
In living organisms, starvation is a severe reduction in vitamin, nutrient, and energy intake, and is the most extreme form of malnutrition.
In humans, prolonged starvation (in excess of 1-2 months) causes permanent organ damage, and may eventually result in death.
Starvation is usually treated by slowly increasing food intake until no nutrient deficiencies remain.
open-encyclopedia.com /Starvation   (153 words)

  
 Resource starvation -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-09)
In (The branch of engineering science that studies (with the aid of computers) computable processes and structures) computer science, starvation is a (additional info and facts about multitasking) multitasking-related problem, where a (A natural prolongation or projection from a part of an organism either animal or plant) process is perpetually denied necessary resources.
Starvation is related to (A situation in which no progress can be made or no advancement is possible) deadlock.
Starvation is illustrated by (additional info and facts about Edsger Dijkstra) Edsger Dijkstra's (additional info and facts about dining philosophers problem) dining philosophers problem.
www.absoluteastronomy.com /encyclopedia/r/re/resource_starvation.htm   (210 words)

  
  Monitors
Starvation occurs when a process waits for a resource that becomes available but is never assigned to that process.
In a starvation situation, the required resource is in continuous use and that is why the process is starved.
The absence of a knot in a general resource graph does not imply the absence of a deadlock in the corresponding system state since a knot is not a necessary condition for deadlock.
www.nvc.cs.vt.edu /~cyrus/f00/ch3.html   (879 words)

  
 The SHARP Resource Coordination Protocol
Centrally managed resources are controlled by a particular agent which is often the agent responsible for producing the resource.
In contrast, unmanaged or decentralized resources, e.g., noise or electricity, are not coordinated by a central entity and the consumers of the resource must coordinate with each other in a decentralized or unmoderated fashion.
When this happens, agents holding resource confirmations for the time slot may be requested to release their reservation or may simply be told that their reservation is canceled (in the centralized version).
dis.cs.umass.edu /research/ihome/papers/AA-99/node5.html   (1140 words)

  
 An HP UX-11i Performance Management Methodology   (Site not responding. Last check: 2007-10-09)
Resource queue growth over time is a strong indicator of a bottleneck, in conjunction with the utilization metric.
The queue for a resource tends to grow when demand increases and when there is not enough resource available to keep up with the requests.
Resource starvation can occur when one resource is saturated and another resource depends upon it.
www.informit.com /articles/article.asp?p=336267&seqNum=4   (649 words)

  
 CERT Advisory CA-96.20 - Sendmail Vulnerabilities
The first vulnerability is a resource starvation problem and the second is a buffer overflow problem.
Resource Starvation ------------------- When email is forwarded to a program using a.forward file or an :include: statement within a.forward or alias file, that program is executed as the owner of the.forward file or the file referenced by the :include: statement.
Linux ===== [For the resource starvation problem:] Debian Linux: not vulnerable (uses smail) Red Hat and derivatives: ftp://ftp.redhat.com/pub/redhat-3.0.3/i386/updates/RPMS/sendmail* Open Software Foundation ======================== OSF's OSF/1 R1.3.2 is not vulnerable to these types of attacks described in the resource starvation sections of the advisory.
www.elec.ucl.ac.be /CERT/1996/msg00028.html   (2415 words)

  
 59.305 Course Notes
If a process that is holding some resources requests another resource that cannot be immediately allocated to it, then all resources currently being held are released.
When a resource is released by a process, assignment edge reconverts to a claim edge.
Starvation - same process may always be picked as victim; include number of rollback in cost factor.
www.massey.ac.nz /~mjjohnso/notes/59305/mod7.html   (1454 words)

  
 Starvation   (Site not responding. Last check: 2007-10-09)
Starvation is the most severe form of malnutrition...
They claim that starvation and dehydration are not painful or discomforting for her or anyone undergoing...
Starvation results from the inadequate intake of nutrients or the inability to metabolize or absorb...
www.all-diet.net /directory/starvation.html   (707 words)

  
 DEADLOCK OVERVIEW   (Site not responding. Last check: 2007-10-09)
A set of processes is permanently blocked because each is waiting for resources held by other processes in the set.
Starvation occurs when a process waits for a resource that repeatedly becomes available, but is always assigned to another process.
The resources are not being used because the owning processes are blocked.
www.cs.uah.edu /~weisskop/cs690_deadlockrev.htm   (417 words)

  
 [No title]
Starvation -- thread waits indefinitely, because some other threads are using resource.
Hold and wait: A process is both holding a resource and waiting for another resource to become free.
General idea: Require information about what resources are going to be requested (or may be requested) and deny requests that will lead to deadlock.
www.cs.utah.edu /classes/cs5460-sam/lectures/lecture11.f99.txt   (973 words)

  
 kbAlertz: (817230) - A resource starvation issue may occur when you running multiple XLANG schedule instances that fail ...
kbAlertz: (817230) - A resource starvation issue may occur when you running multiple XLANG schedule instances that fail with a 0x8004e007 error.
A resource starvation issue may occur when you running multiple XLANG schedule instances that fail with a 0x8004e007 error.
The lack of system resources may cause an access violation in a custom component.
www.kbalertz.com /kb_817230.aspx   (477 words)

  
 Dell Power Solutions
Resource management software can increase server utilization by giving administrators control over the system resources available to individual applications, services, and processes within the operating system (OS).
Although resource allocations between the two applications were made based on average workloads, at certain times heavier loads on the Web server existed while the database requests were less than average.
After resources have been allocated to a group of processes, the WSRM service monitors the resource usage of each managed process in the group.
www1.us.dell.com /content/topics/global.aspx/power/en/ps2q03se_purush?c=us&l=en&s=esg   (2136 words)

  
 [No title]   (Site not responding. Last check: 2007-10-09)
Starvation: A condition in which a process is indefinitely delayed because other processes are always given preference.
Starvation is possible if more than one process is waiting to enter CS.
Preempt for the requester New allocation is never denied, if a requested resource is currently in use, preempt it from its owner.
www.cse.msu.edu /~ahmadfa1/CSE410CheatSheet2.doc   (832 words)

  
 An HP UX-11i Performance Management Methodology   (Site not responding. Last check: 2007-10-09)
End-of-month processing will usually consume a very large amount of system resources, making it necessary to either keep the interactive users off the system while it is being run, or to run it in off-hours.
For instance, it is often mentioned that resource utilization in an office environment peaks at 11:00 a.m.
The Information Technology (IT) department (also called Information Systems in some organizations) may be trying to allocate computing resources fairly, and it may not be possible to make changes that improve the situation for only one group.
www.informit.com /articles/article.asp?p=336267&seqNum=4   (2501 words)

  
 Section 107 Notes
Mutual exclusion:  at least 1 resource in consideration has to be nonsharable, so that only 1 process at a time can use it.
This looks for a thread that has not “finished” in this simulation and whose need is less than the currently available amount of resource for this simulation, in other words it’s looking for a thread that hasn’t “finished” but whose future requests we can support.
If we got here that means either all processes can finish, or that we were unable to supply the need for at least one process (even after “finishing” as many other processes as we could and “returning” those resources).
www.ocf.berkeley.edu /~jerylkat/cs162/010227.html   (1426 words)

  
 Vulnerabilities in Sendmail
The first vulnerability is a resource starvation and the second is a buffer overflow problem.
By starving sendmail of specific resources, sendmail will create files owned by the default user.
Resource Starvation ------------------- Eric Allman, the author of sendmail, has provided the following workaround to the resource starvation vulnerability.
ciac.llnl.gov /ciac/bulletins/g-43a.shtml   (3094 words)

  
 [No title]
IO port starvation is fairly uncommon, but sometimes happens with cards that require large, contiguous, aligned regions of IO port space, or that only recognize a few specific IO port positions.
Find out what resources the card is using (from the system log), and try excluding these in /etc/pcmcia/config.opts to force the card to use something different.
Resource allocation for PCMCIA devices In theory, it should not really matter which interrupt is allocated to which device, as long as two devices are not configured to use the same interrupt.
pcmcia-cs.sourceforge.net /ftp/PCMCIA-HOWTO   (20235 words)

  
 [Beowulf] SGE + policy
Your need to *stop* a long running job to let a shorter one in is a bit harder as graceful job premption/supension is something that normally takes a bit of configuring (both of the app and of Grid Engine).
The SGE mailing list users at gridengine.sunsource.net (I think you must be a member to post) or the searchable mailing list archives at http://gridengine.sunsource.net may be very helpful.
Equal share mode appears to solve a different > resource starvation problem -- that produced by a single user or group > saturating the queue with lots of jobs, little or big, so that others > submitting after they've loaded the queue have to wait days or weeks to > get on.
www.scyld.com /pipermail/beowulf/2004-May/009994.html   (774 words)

  
 [Beowulf] SGE + policy
For i < j, > starvation of the short jobs shouldn't occur too often, save when > there's too many masters' students trying to get their projects done in > time to graduate and the deadline's tomorrow.
The lack of even coarse grained kernel-style job control for a cluster continues to be a source of frustration.
It wouldn't deal with license starvation, since I don't know how a running matlab task can "temporarily relinquish a license" while it is stopped, but it would manage the problem of being able to use a cluster for a mix of prioritized long and short running jobs without resource-starving the short ones.
www.beowulf.org /pipermail/beowulf/2004-May/009979.html   (853 words)

  
 Mac OS X 10.0 - Page 7 - (03/2001)   (Site not responding. Last check: 2007-10-09)
The classic resource starvation "crasher" is the fork bomb, named after the Unix system call that spawns a new process.
The end result is a process that multiplies and gobbles memory and kernel resources until the system is so unresponsive that it can essentially be declared dead.
I also suspect that successful resource starvation attacks from normal users are possible, but I wasn't able to cause any real harm in my brief testing.
arstechnica.com /reviews/01q2/macos-x-final/macos-x-7.html   (1116 words)

  
 Hardware Questions   (Site not responding. Last check: 2007-10-09)
By "resources" I refer to the various component of your computer (such as disk space and memory) that combine together to give your computer "thinking power" or the ability to perform the millions of calculations it does every second.
The more resources are used, the less are left for "thinking" and therefore the slower your computer becomes.
You can check the resources any time, but please realize that what you're looking at is a report taken at the time.
www.mydcms.com /qhardw1.htm   (1791 words)

  
 [No title]
Deadlock vs. Starvation Starvation Starvation occurs when a process waits for a resource that becomes available but is never assigned to that process.
A cycle in the WFG is indicative of a deadlock in the system when there is only one unit of every resource in the system.
Deadlock Prevention Requesting processes are given resources in a way such that the request does not lead to deadlock.
www.nvc.cs.vt.edu /~cyrus/f00/ch3.doc   (1158 words)

  
 A Distributed Solution for Resources Allocation to Overlapping Groups   (Site not responding. Last check: 2007-10-09)
The distributed resource allocation problem is a well known fundamental problem in distributed systems.
With the progress of computer networks, however, distributed cooperative group activities in a network environment have been increasing, so that several groups may compete for some resources in the network environment and deadlock among groups and starvation of a group may happen.
Since previous allocation models are mainly for representation of competition for resources among processes, they cannot reflect clearly the competition for resources among groups of processes.
csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/icpads/2000/0568/00/0568toc.xml&DOI=10.1109/ICPADS.2000.857685   (275 words)

  
 Buffer Underrun
A buffer underrun happens when information cannot be recorded to the CD because of resource starvation.
For example, if your hard drive can only read information at a rate of X and the CD Recording needs information at a rate of X+1, this is referred to resource starvation and a buffer underrun will ensue.
But be forewarned, you might end up burning a bad disc because of resource starvation.
www.infopackets.com /freenewsarticles/buffer+underrun.htm   (782 words)

  
 Techworld.com - Coping with a DoS Attack
Resource starvation is when an end system (usually a server or possibly a router) is targeted, and all of its resources used up so that it can’t process any new, legitimate sessions, thereby denying access, for example an ecommerce server that can’t be used by potential customers.
One of the most common resource starvation attacks is using SYN floods, whereby an attacker launches multiple TCP SYN connection requests at a server.
Because it can be quite tricky for one attacker to over-utilise a corporation’s bandwidth (or use up all processing resources on a large server), with a DDoS attack, an attacker sends information to a group of vulnerable systems, not to attack them, but to make them attack a third, different target.
www.techworld.com /security/features/index.cfm?featureid=813   (1290 words)

  
 Improving Jobsite Efficiency
The answer to time compression and resource starvation isn't working longer hours or working harder.
Plans should provide easy access to the project manager or designate (usually the project engineer) who can be the project decision-maker for the field crews.
When planning, consider your team's capabilities, the resources they will need, other demands on the team, and the relative importance of each task to the whole project.
ecmweb.com /mag/electric_improving_jobsite_efficiency/index.html   (1048 words)

  
 AusCERT - ESB-2003.0682 -- FreeBSD-SA-03:14.arp -- denial of service due to ARP resource starvation
Background The Address Resolution Protocol (ARP) is fundamental to the operation of IP with a variety of network technologies, such as Ethernet and WLAN.
If the reciprocal ARP entry is not in use by an upper layer protocol, the reference count will be zero.
Problem Description Under certain circumstances, it is possible for an attacker to flood a FreeBSD system with spoofed ARP requests, causing resource starvation which eventually results in a system panic.
www.auscert.org.au /render.html?it=3485   (774 words)

  
 [No title]
Figure 8.9 illustrates deadlock; this is an example of a resource allocation graph: Arrows FROM process TO resource indicate a resource request.
VMS uses a timer of 10 seconds after a resource request is started.
If when the timer goes off the request is still not granted then the deadlock detection/recovery algorithm is invoked.
www.cs.fsu.edu /~jtbauer/cop4610/lectures/ch8/ch8.ppt   (941 words)

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