i'm looking for some assistance in execution of Jmeter distributed test runs using Jenkins hosted on Windows platform.
I need to know how to
A hint: if you don't "stop the above process once the test run completes" you won't have to "start" them.
If you want to control everything from Jenkins you need to install Jenkins agent process on each machine you intend to use as JMeter slave, see Step by step guide to set up master and agent machines on Windows Jenkins wiki page for more details.
Once done you can create a job which will start JMeter processes using simple "Execute windows batch command" step on the agent machines
With regards to your point 2 - it's sufficient to set server.exitaftertest JMeter property to true on slave machines in any convenient way, i.e. by adding -J command-line argument like:
jmeter-server.bat -Jserver.exitaftertest=true
For any Distributed Load Run via Jmeter, the pre-requisite is to get the Jmeter-server.bat running to support and enable master-slave communications by Jmeter between Load agents. Initially i had a struggle how to get this executed as first step in Jenkins and then followed execution of Jmeter commands for load test using Remote distributed run. Hence instead of running the pre-requisite condition of running Jmeter-server.bat from jenkins i made it as a Windows service (as load agents are windows machines) which is running all time and whenever Load test starts from Jenkins, the Jmeter-server running in background which will allow distributed run to go.