Performance Improvement since Bahmni 0.87

Major changes in Bahmni 0.87:

OpenMRS has been upgraded to major version 2.0
Java has upgraded to version 8

Performance monitoring has been done by running a set of gatling scenarios for a certain period of time, which mimics the realtime scenarios.
The gatling simulation includes scenarios for Clinical flow, Registration flow, Inpatient flow and Atomfeed calls.

The scenarios and configuration can be found here: https://github.com/Bahmni/experiment/tree/master/bahmni-gatling/src/test/scala/org/bahmni/gatling

Environment and Test Configurations:

RAM	8GB
Swap space	4GB
Database used	Anonymised Prod data
Services run	Openmrs
Test Duration	1 hour
Load Configuration	load configuration
Monitoring tool	Newrelic APM tool

Observations:

Before Upgrade:

Average Response time	Throughput
119 ms	1840 rpm

After Upgrade:

Average Response time	Throughput
43 ms	4140 rpm

JVM and CPU has been found stable before and after the upgrade.

Since Java 8, Java's share in CPU time has also been reduced by approximately 10%.

There were number of performance improvements done in OpenMRS as well. One such improvement is enabling hibernate second level cache for entities like Person, Address, PersonName, GlobalProperty, Role, Privilege.