Default heap memory size for vCenter Server vsphere-ui service
Article ID: 436095
Updated On:
Products
Issue/Introduction
Clarification regarding the default available memory (heap size) initialization for the vsphere-ui service within the vCenter Server Appliance (vCSA).
Environment
VMware vCenter Server 8.0
Resolution
The initialized memory value configured on the system can be verified by executing the following command:
cloudvm-ram-size -l vsphere-ui
For Tiny deployments (14GB memory), approximately 853 MB is allocated as the initial value.
For Small deployments (21GB memory) and above, a predefined weight is applied to the system memory increment, dynamically calculating and expanding the allocated service memory.
Default values by deployment size in vSphere 8.0 U3
(Note: These values may vary depending on the specific environment and vSphere version):
| Tiny （14GB） | ~853 MB |
| Small （21GB） | ~1113 MB |
| Medium （30GB） | ~1454 MB |
| Large （39GB） | 3256 MB |
| XLarge （58GB） | 3256 MB |
Deployments sized Large or greater set the vsphere-ui memory expansion at 3256 MB.
Additional Information
The actual Java heap size maximum limit (-Xmx) for the Java program is configured as the output value of the above command minus the CompressClassSize limit (256MB).
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