Summary of results
The following table summarizes the host utilization metrics for the different Login VSI workloads that we tested, and the user density derived from Login VSI performance testing:
|Server configuration||Workload||Operating system||User density||Average CPU||Average memory active (GB)||Average IOPS per user||Average net Mbps per user|
|Density Optimized||Task Worker||Server 2019, 1809||397||84.87%||124||1.7||0.58|
|Density Optimized||Knowledge Worker||Windows 10, 21H2||312||82.79%||370||11||1.93|
The host utilization metrics mentioned in the table are defined as follows:
- User density—The number of users per compute host that successfully completed the workload test within the acceptable resource limits for the host. For clusters, this number reflects the average of the density achieved for all compute hosts in the cluster.
- Average CPU—The average CPU usage over the steady-state phase. For clusters, this number represents the combined average CPU usage of all compute hosts. On the latest Intel processors, the ESXi host CPU metrics exceed the rated 100 percent for the host if Turbo Boost is enabled, which is the default setting. An additional 35 percent of CPU is available from the Turbo Boost feature, but this additional CPU headroom is not reflected in the VMware vSphere metrics where the performance data is gathered.
- Average active memory—For ESXi hosts, the amount of memory that is actively used, as estimated by the VMKernel based on recently touched memory pages. For clusters, this is the average amount of physical guest memory that is actively used across all compute hosts over the steady state period.
- Average IOPS per user—IOPS calculated from the average cluster disk IOPS over the steady state period divided by the number of users.
- Average network usage per user—Average network usage on all hosts calculated over the steady state period divided by the number of users.
We conducted PAAC testing on this solution using the Login VSI load-generation tool. Login VSI is an industry-standard tool for benchmarking VDI workloads. It uses a carefully designed, holistic methodology that monitors both hardware resource utilization parameters and EUE during load testing.