Protocol Benchmarking - OSI-Pi

The numbers in the tables below represent the ideal throughput for the data pump use case (data traveling from a protocol adapter to the Predix Edge MQTT Broker to the Cloud Gateway to Time Series).

The tests were executed in a controlled environment with one adapter running at a time, under ideal network conditions with a local time series simulator. The rate was deemed successful if there was less than a 1 percent loss rate over the course of a multi-hour test. Based on the testing, data loss rates dramatically increase as tag counts pass these thresholds.

The tested VMs were configured as follows (with a 2GHz vCPU):

Table 1. Tested VM Configurations
VM	Processors	RAM (GB)	Disk Space (GB)
VM (small)	1	1	5
VM (medium)	2	4	20
VM (large)	4	8	20

Table 2. OSI-Pi Poll
Environment	Period (seconds)	Acceptable Tag Rate
VM (small)	1	150
VM (small)	10	2000*
VM (medium)	1	TBD
VM (medium)	10	TBD
VM (large)	1	TBD
VM (large)	10	TBD
Predix Edge Gateway 3002	1	525
Predix Edge Gateway 3002	10	2000*

* This value represents the limit to which testing was conducted, rather than a limit that indicates increased tag counts would result in a 1 percent loss rate.

The number of tags per adapter does not scale with the device’s performance characteristics. It is recommended to add new adapters to support higher tag counts along with corresponding physical hardware to support the additional applications.