How does JVM calculate the committed heap memory?
Based on the documentation : https://docs.oracle.com/javase/7/docs/api/java/lang/management/MemoryUsage.html
committed - represents the amount of memory (in bytes) that is guaranteed to be available for use by the Java virtual machine. The amount of committed memory may change over time (increase or decrease). The Java virtual machine may release memory to the system and committed could be less than init. committed will always be greater than or equal to used.
but the question is how JVM calculate the committed memory?
java heap-memory
edited Nov 14 '18 at 9:12
Sofo Gial
442515
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
add a comment |
Based on the documentation : https://docs.oracle.com/javase/7/docs/api/java/lang/management/MemoryUsage.html
committed - represents the amount of memory (in bytes) that is guaranteed to be available for use by the Java virtual machine. The amount of committed memory may change over time (increase or decrease). The Java virtual machine may release memory to the system and committed could be less than init. committed will always be greater than or equal to used.
but the question is how JVM calculate the committed memory?
java heap-memory
edited Nov 14 '18 at 9:12
Sofo Gial
442515
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
Closely related to stackoverflow.com/questions/41468670/…
– Raedwald
Nov 14 '18 at 9:40
The strategy heavily relies on the JVM and the GC versions. Different versions give different strategies.
– Sofo Gial
Nov 14 '18 at 9:41
Do you want to know how the JVM calculates the amount of memory that it requests from the OS or the amount that is currently comitted?
– dpr
Nov 14 '18 at 9:42
@dpr, i am aware that amount of committed memory may change over time (increase or decrease). I want to know the basis of increase/decrease of committed memory.
– Andrew
Nov 14 '18 at 10:27
@Andrew You can find some relevant info here: docs.oracle.com/javase/9/gctuning/…
– Sofo Gial
Nov 14 '18 at 11:54
add a comment |
Based on the documentation : https://docs.oracle.com/javase/7/docs/api/java/lang/management/MemoryUsage.html
committed - represents the amount of memory (in bytes) that is guaranteed to be available for use by the Java virtual machine. The amount of committed memory may change over time (increase or decrease). The Java virtual machine may release memory to the system and committed could be less than init. committed will always be greater than or equal to used.
but the question is how JVM calculate the committed memory?
java heap-memory
edited Nov 14 '18 at 9:12
Sofo Gial
442515
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
Based on the documentation : https://docs.oracle.com/javase/7/docs/api/java/lang/management/MemoryUsage.html
committed - represents the amount of memory (in bytes) that is guaranteed to be available for use by the Java virtual machine. The amount of committed memory may change over time (increase or decrease). The Java virtual machine may release memory to the system and committed could be less than init. committed will always be greater than or equal to used.
but the question is how JVM calculate the committed memory?
java heap-memory
java heap-memory
edited Nov 14 '18 at 9:12
Sofo Gial
442515
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
edited Nov 14 '18 at 9:12
Sofo Gial
442515
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
edited Nov 14 '18 at 9:12
Sofo Gial
442515
edited Nov 14 '18 at 9:12
Sofo Gial
442515
edited Nov 14 '18 at 9:12
Sofo Gial
442515
442515
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
asked Nov 14 '18 at 9:08
AndrewAndrew
55041025
55041025
Closely related to stackoverflow.com/questions/41468670/…
– Raedwald
Nov 14 '18 at 9:40
The strategy heavily relies on the JVM and the GC versions. Different versions give different strategies.
– Sofo Gial
Nov 14 '18 at 9:41
Do you want to know how the JVM calculates the amount of memory that it requests from the OS or the amount that is currently comitted?
– dpr
Nov 14 '18 at 9:42
@dpr, i am aware that amount of committed memory may change over time (increase or decrease). I want to know the basis of increase/decrease of committed memory.
– Andrew
Nov 14 '18 at 10:27
@Andrew You can find some relevant info here: docs.oracle.com/javase/9/gctuning/…
– Sofo Gial
Nov 14 '18 at 11:54
add a comment |
Closely related to stackoverflow.com/questions/41468670/…
– Raedwald
Nov 14 '18 at 9:40
The strategy heavily relies on the JVM and the GC versions. Different versions give different strategies.
– Sofo Gial
Nov 14 '18 at 9:41
Do you want to know how the JVM calculates the amount of memory that it requests from the OS or the amount that is currently comitted?
– dpr
Nov 14 '18 at 9:42
@dpr, i am aware that amount of committed memory may change over time (increase or decrease). I want to know the basis of increase/decrease of committed memory.
– Andrew
Nov 14 '18 at 10:27
@Andrew You can find some relevant info here: docs.oracle.com/javase/9/gctuning/…
– Sofo Gial
Nov 14 '18 at 11:54
Closely related to stackoverflow.com/questions/41468670/…
– Raedwald
Nov 14 '18 at 9:40
Closely related to stackoverflow.com/questions/41468670/…
– Raedwald
Nov 14 '18 at 9:40
The strategy heavily relies on the JVM and the GC versions. Different versions give different strategies.
– Sofo Gial
Nov 14 '18 at 9:41
The strategy heavily relies on the JVM and the GC versions. Different versions give different strategies.
– Sofo Gial
Nov 14 '18 at 9:41
Do you want to know how the JVM calculates the amount of memory that it requests from the OS or the amount that is currently comitted?
– dpr
Nov 14 '18 at 9:42
Do you want to know how the JVM calculates the amount of memory that it requests from the OS or the amount that is currently comitted?
– dpr
Nov 14 '18 at 9:42
@dpr, i am aware that amount of committed memory may change over time (increase or decrease). I want to know the basis of increase/decrease of committed memory.
– Andrew
Nov 14 '18 at 10:27
@dpr, i am aware that amount of committed memory may change over time (increase or decrease). I want to know the basis of increase/decrease of committed memory.
– Andrew
Nov 14 '18 at 10:27
@Andrew You can find some relevant info here: docs.oracle.com/javase/9/gctuning/…
– Sofo Gial
Nov 14 '18 at 11:54
@Andrew You can find some relevant info here: docs.oracle.com/javase/9/gctuning/…
– Sofo Gial
Nov 14 '18 at 11:54
add a comment |
1 Answer
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Here you can find a little bit more detail, but it does not explain the exact way how committed heap space is increased:
There is also a committed heap size which acts as a "high water
mark", moving up once the JVM cannot free up space even on old
collection / young collection to make room. In this case, the
committed heap size is increased. This cycle repeats until the
committed heap size matches the maximum heap size, the maximum space
allocatable.
https://support.mulesoft.com/s/article/Java-JVM-memory-allocation-pattern-explained
answered Nov 14 '18 at 12:38
josmafjosmaf
738
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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oldest
votes
Here you can find a little bit more detail, but it does not explain the exact way how committed heap space is increased:
There is also a committed heap size which acts as a "high water
mark", moving up once the JVM cannot free up space even on old
collection / young collection to make room. In this case, the
committed heap size is increased. This cycle repeats until the
committed heap size matches the maximum heap size, the maximum space
allocatable.
https://support.mulesoft.com/s/article/Java-JVM-memory-allocation-pattern-explained
answered Nov 14 '18 at 12:38
josmafjosmaf
738
add a comment |
Here you can find a little bit more detail, but it does not explain the exact way how committed heap space is increased:
There is also a committed heap size which acts as a "high water
mark", moving up once the JVM cannot free up space even on old
collection / young collection to make room. In this case, the
committed heap size is increased. This cycle repeats until the
committed heap size matches the maximum heap size, the maximum space
allocatable.
https://support.mulesoft.com/s/article/Java-JVM-memory-allocation-pattern-explained
answered Nov 14 '18 at 12:38
josmafjosmaf
738
add a comment |
Here you can find a little bit more detail, but it does not explain the exact way how committed heap space is increased:
There is also a committed heap size which acts as a "high water
mark", moving up once the JVM cannot free up space even on old
collection / young collection to make room. In this case, the
committed heap size is increased. This cycle repeats until the
committed heap size matches the maximum heap size, the maximum space
allocatable.
https://support.mulesoft.com/s/article/Java-JVM-memory-allocation-pattern-explained
answered Nov 14 '18 at 12:38
josmafjosmaf
738
Here you can find a little bit more detail, but it does not explain the exact way how committed heap space is increased:
There is also a committed heap size which acts as a "high water
mark", moving up once the JVM cannot free up space even on old
collection / young collection to make room. In this case, the
committed heap size is increased. This cycle repeats until the
committed heap size matches the maximum heap size, the maximum space
allocatable.
https://support.mulesoft.com/s/article/Java-JVM-memory-allocation-pattern-explained
answered Nov 14 '18 at 12:38
josmafjosmaf
738
answered Nov 14 '18 at 12:38
josmafjosmaf
738
answered Nov 14 '18 at 12:38
josmafjosmaf
738
answered Nov 14 '18 at 12:38
josmafjosmaf
738
738
add a comment |
add a comment |
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Closely related to stackoverflow.com/questions/41468670/…
– Raedwald
Nov 14 '18 at 9:40
The strategy heavily relies on the JVM and the GC versions. Different versions give different strategies.
– Sofo Gial
Nov 14 '18 at 9:41
Do you want to know how the JVM calculates the amount of memory that it requests from the OS or the amount that is currently comitted?
– dpr
Nov 14 '18 at 9:42
@dpr, i am aware that amount of committed memory may change over time (increase or decrease). I want to know the basis of increase/decrease of committed memory.
– Andrew
Nov 14 '18 at 10:27
@Andrew You can find some relevant info here: docs.oracle.com/javase/9/gctuning/…
– Sofo Gial
Nov 14 '18 at 11:54