What does "0 MB Free unallocated memory" mean?
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
In the Confluence administration console under the System Information page (/admin/systeminfo.action), you will find JVM Statistics displaying information such as:
Solution
Environment
Confluence Server
Confluence Data Center
What Does This Mean
When you configure both the JVM heap Xmx and Xms with identical values, it will be displayed as '0 MB Free unallocated memory.' This is an expected outcome and does not raise any concerns.
However, if your system has different values for Xmx and Xms, it will be displayed as follows. For example, if Xms is set to 1024 MB and Xmx is set to 2048 MB, it will show as 1024 MB of unallocated memory because 2048 (Xmx) - 1024 (Xms) equals 1024.
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