-XX:ActiveProcessorCount
This HotSpot option is recognized by Eclipse OpenJ9™ for compatibility. Use this option to override the number of CPUs that the VM automatically detects and uses when creating threads for various subsystems.
Syntax
-XX:ActiveProcessorCount=<n>
Where <n> is the number of CPUs.
| Setting | Value | Default |
|---|---|---|
<n> |
1 or greater | There is no default value. This option is not enabled by default. If set to 0, there is no effect. |
When you set this option the following line in a Java dump file is updated to indicate the number of CPUs specified:
2CIACTIVECPU Active CPUs
If this option is not set, the value for this line is 0 Active CPUs.