About: Memory overcommitment

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Memory overcommitment is a concept in computing that covers the assignment of more memory to virtual computing devices (or processes) than the physical machine they are hosted, or running on, actually has. This is possible because virtual machines (or processes) do not necessarily use as much memory at any one point as they are assigned, creating a buffer. If four virtual machines each have 1 GB of memory on a physical machine with 4 GB of memory, but those virtual machines are only using 500 MB, it is possible to create additional virtual machines that take advantage of the 500 MB each existing machine is leaving free. Memory swapping is then used to handle spikes in memory usage. The disadvantage of this approach is that memory swap files are slower to read from than 'actual' memory, whi

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rdf:type	yago:WikicatVirtualMachines yago:Artifact100021939 yago:Device103183080 yago:Instrumentality103575240 yago:Machine103699975 yago:Object100002684 yago:PhysicalEntity100001930 yago:Whole100003553
rdfs:label	Memory overcommitment (en)
rdfs:comment	Memory overcommitment is a concept in computing that covers the assignment of more memory to virtual computing devices (or processes) than the physical machine they are hosted, or running on, actually has. This is possible because virtual machines (or processes) do not necessarily use as much memory at any one point as they are assigned, creating a buffer. If four virtual machines each have 1 GB of memory on a physical machine with 4 GB of memory, but those virtual machines are only using 500 MB, it is possible to create additional virtual machines that take advantage of the 500 MB each existing machine is leaving free. Memory swapping is then used to handle spikes in memory usage. The disadvantage of this approach is that memory swap files are slower to read from than 'actual' memory, whi (en)
dcterms:subject	Hardware virtualization Virtual machines
Wikipage page ID	41961615 (xsd:integer)
Wikipage revision ID	1080188966 (xsd:integer)
Link from a Wikipage to another Wikipage	Linux kernel Computing Memory ballooning Windows NT Hardware virtualization Virtual machines Random-access memory Virtual machine Virtualization Memory swapping
sameAs	Memory overcommitment Memory overcommitment Memory overcommitment Memory overcommitment
dbp:wikiPageUsesTemplate	dbt:Compsci-stub dbt:Reflist
has abstract	Memory overcommitment is a concept in computing that covers the assignment of more memory to virtual computing devices (or processes) than the physical machine they are hosted, or running on, actually has. This is possible because virtual machines (or processes) do not necessarily use as much memory at any one point as they are assigned, creating a buffer. If four virtual machines each have 1 GB of memory on a physical machine with 4 GB of memory, but those virtual machines are only using 500 MB, it is possible to create additional virtual machines that take advantage of the 500 MB each existing machine is leaving free. Memory swapping is then used to handle spikes in memory usage. The disadvantage of this approach is that memory swap files are slower to read from than 'actual' memory, which can lead to performance drops. While memory overcommitment is usually talked about in the context of virtualization, it is actually a generalised concept; Windows NT contained overcommitment features, as do most modern generalised operating systems, including the Linux kernel. (en)
gold:hypernym	Concept
prov:wasDerivedFrom	wikipedia-en:Memory_overcommitment?oldid=1080188966&ns=0
page length (characters) of wiki page	2468 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Memory_overcommitment
is Link from a Wikipage to another Wikipage of	Memory management (operating systems) Memory virtualization Memory paging Memory ballooning Bin packing problem Memory overcommit OVirt Virtual machine System virtual machine Overcommit Overcommitment
is Wikipage redirect of	Memory overcommit Overcommit Overcommitment
is foaf:primaryTopic of	wikipedia-en:Memory_overcommitment

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