On the ESRI page for shared instance pools, it says:
"If most or all of your site's services use the shared instance pool, consider setting the number of service instances in the shared pool to twice the number of physical CPU cores on the individual machines in your ArcGIS Server site (for example, if you're using 4-core machines, consider setting the pool size to eight instances).
Note:
If you are using hyperthreading, vCPUs, or logical cores (for example, if your site is in a virtual or cloud environment), consider each logical core equal to one-half of a physical core."
Out of curiosity:
- How is this formula determined and why?
- What's the consequence if this recommendation is exceeded?
- Why are VM cores equal to half a physical?
