Can not start the agen after changing application parameters

After I changed following values in wrapper.config file I can not start the agent. Our build needs a heap size of upto 2.5 GB and this seems achievable only after changing following values. If we leave the default values on then we get the heap out of memory error in the build log.

Current values-

# Initial Java Heap Size (in MB)
wrapper.java.initmemory.2=100

# Maximum Java Heap Size (in MB)
wrapper.java.maxmemory.3=3072

wrapper.app.parameter.3=-Xmx3072m

Default Values-

# Initial Java Heap Size (in MB)
wrapper.java.initmemory.2=3

# Maximum Java Heap Size (in MB)
wrapper.java.maxmemory.3=512

wrapper.app.parameter.3=-Xmx512m

The error that we are getting in launcher.log is as follows:

The error in wrapper.log is ad follows:

2018-10-31 20:43:54,352] INFO - dServer.agent.run.AgentProcess - Agent process finished
[2018-10-31 20:43:54,352] INFO - ldServer.agent.run.AgentRunner - Agent has exited with code: 1
[2018-10-31 20:43:54,352] ERROR - ldServer.agent.run.AgentRunner - Too short run time, most likely there is some installation problem: 0.015 sec.
[2018-10-31 20:43:54,352] INFO - ldServer.agent.run.AgentRunner - Launcher is exiting

Error occurred during initialization of VM
INFO | jvm 1 | 2018/10/31 20:43:54 | Could not reserve enough space for 3145728KB object heap
INFO | jvm 1 | 2018/10/31 20:43:54 | Agent process finished
INFO | jvm 1 | 2018/10/31 20:43:54 | Agent has exited with code: 1
INFO | jvm 1 | 2018/10/31 20:43:54 | Too short run time, most likely there is some installation problem: 0.015 sec.
INFO | jvm 1 | 2018/10/31 20:43:54 | Launcher is exiting
STATUS | wrapper | 2018/10/31 20:43:56 | <-- Wrapper Stopped

Server configuration is :

Windows server 2012 R2 Standard

RAM 8 GB

System-64 bit

Please advice on the same. Huge thanks in advance.