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53 Dell HPC System for Manufacturing—System Architecture and Application Performance
One of the features of the NICE DCV Endstation client is the DCV Console. The console allows the user to
dynamically adjust quality vs network bandwidth utilization by using a slider bar and to monitor the
bandwidth being used by the client. For most uses, the 60% setting provides a good balance between
bandwidth usage and image quality. One of the useful features of the NICE DCV solution is that the final
image delivered to the client after display updates have stopped is always lossless, regardless of the quality
level setting. This ensures that static images are always shown with full quality on the client.
Figure 51 NICE DCV Endstation Console
For testing, the 60% quality setting was used for the client. In a LAN setting, with significant bandwidth and
low latency, the remote application responsiveness and rendering performance was very good. In a WAN
environment, application responsiveness and rendering performance was also very good as long as
network latency remained less than about 150 ms and sufficient network bandwidth was available. When
network latency exceeded about 150 ms, delays in the application response became noticeable, which is
expected. NICE recommends that for these situations, the user can adjust compression on the fly to
accommodate for low bandwidth using the DCV Console.
For typical applications at the 60% quality level, average network bandwidth utilization ranged from 150 to
800 KiBps during display updates and dropped to 0 kb/s for static images. Peak network bandwidth was
approximately 1.0 MiBps for all of the tested applications at the 60% quality setting. At higher quality
settings, average network bandwidth gradually increased, with a significant increase in bandwidth
utilization from the 90% to the Lossless setting.
Overall, the NICE DCV solution performed well and offers a good solution for remote visualization users.