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Reference: default JVM heap calculation #127482

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Reference: default JVM heap calculation
mmahacek Apr 28, 2025
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Update docs/reference/elasticsearch/jvm-settings.md
mmahacek Apr 28, 2025
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Update jvm-settings.md
mmahacek Apr 29, 2025
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Update jvm-settings.md
mmahacek Apr 29, 2025
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12 changes: 12 additions & 0 deletions docs/reference/elasticsearch/jvm-settings.md
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Expand Up @@ -128,6 +128,18 @@ If you are running {{es}} as a Windows service, you can change the heap size usi
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## Default JVM heap sizes [default-jvm-sizes]

If heap sizes are not specifically set, {{es}} will calculate JVM heap sizing based on the total amount of system memory, depending on the node's role.

* Master-only node
* 60% of total system memory, up to a maximum of 31 GB.
* Machine Learning-only node
* 40% of the first 16 gigabytes plus 10% of memory above that when total system memory is more than 16 gigabytes, up to a maximum of 31 GB.
* Data-only node
* 40% of total system memory when less than 1 GB, with a minimum of 128 MB.
* 50% of total system memory when more than 1 GB, with a maximum of 31 GB.


## JVM heap dump path setting [heap-dump-path-setting]

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