Performance system values: Machine memory pool size
The Machine memory pool size system value is also known as QMCHPOOL. You can use this system value to specify the size of the machine memory pool.
| Quick reference | |
|---|---|
| Location | From IBM® Navigator for i, select . Right-click on Performance and click Properties, then select the Memory Pools tab. |
| Special authority | None. |
| Default value | 20. |
| Changes take effect | Immediately. |
| Lockable | No. |
What can I do with this system value?
You can specify the size of the machine memory pool in megabytes (MB). A memory pool is a logical division of memory (storage) that is reserved for processing a job or group of jobs. The machine memory pool contains highly shared machine and operating system programs. Be careful when you change the size for this memory pool because system performance might be impaired if the memory pool is too small.
The machine-enforced minimum value varies depending on the memory size of the machine. The system automatically increases the actual size of the machine memory pool to the machine-enforced minimum value if you specify a smaller value.
If the system has increased the actual size of the machine memory pool, you can determine the actual machine-enforced minimum value for the machine disk pool (pool 1). To view the minimum value for this disk pool in IBM Navigator for i, expand .