How can i know the model which the simulator is using?

 I am not familiar with gpdk180 (foundry?), but independent on PDK you should be able to see the transistor models by browsing the netlist.

Find the include-line pointing to the model file, open the file and compare the content with the transistor instantiations elsewhere in the netlist.

 Check the model libraies in the model directory of your PDK and look

for the model card

model ModelName ModelIdentifier

e.g.

model nch bsim3v3

 spectre -h in the command line my help to

Bernd

In OCEAN you can extract this after a dc operating point having been run (with spectre as the simulator):

openResults("/path/to/psf")
selectResult('dcOpInfo)
outputs() => will list all the devices in the operating point data
dataType("/I7/M2") => "bsim3v3" (for example)

I don't think there's an interactive way to get this - but then it's a fairly unusual thing to do.

The gpdk180 transistor models are bsim3v3. You can see this (as was suggested by kennethbrun) by looking in the model files, which are at <GPDK180instDir>/models/spectre/*mos*.scs . 

Changing them to EKV will involve you having to provide a different set of model files (you'd have to create these yourself) and reference the models in Setup->Model Libraries in ADE. Given that model files are "characterized" (although in GPDK it's an artificial process, so they're effectively made up), that's not a trivial task unless you have some EKV models from elsewhere.

Regards,

Andrew.