working set size (WSS) of the Dgraph process

The working set of the Dgraph process is a collection of pages in the virtual address space of the process that is resident in physical memory. The pages in the working set have been most recently and frequently referenced. In other words, the Dgraph working set is the amount of memory a Dgraph process is consuming now. This is the amount of memory that is needed to avoid paging.

The following statements describe the working set size (WSS):

The WSS cannot be computed, although it is always less than or equal to the amount of virtual process size for the MDEX Engine.
Determine the WSS experimentally: if you notice that increasing RSS (by adding RAM or subtracting competing processes) improves performance of the MDEX Engine, this means that the WSS was previously larger than the RSS. This was likely the cause of the performance degradation.
If the size of the WSS grows too close to the amount of RAM, or starts to exceed it, paging to disk begins and you will notice rapid decreases in performance.

For more information, see the MDEX Engine Performance Tuning Guide.