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The performance adjuster algorithm looks only if the pool is paging but doesn't care if it has already free memory. This causes sometimes that a pool start stealing a lot of memory without using it. The algorithm should look at the unallocated memory in that pool to determine if it needs to keep adding memory.
Many customers needs to turn off Performance Adjuster because some jobs page a lot but they are not using the memory (e.g. interactive jobs or qzrcsrvs prestart jobs).
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