Allow setting existing parameters from the command line

[vkarak]

That's a current limitation. You cannot reset a parameter from the command line. It would be nice to be able to do:

class my_test(...):
    x = parameter(range(10))

reframe --parametrise my_test.x=1,4,5

and change the parameterisation of my_test.

[casparvl]

+1, we'd be interested in that. I'd like to have e.g. a test that by default parametrizes over all GROMACS modules find by find_modules. But sometimes, I may want to run the test just with one particular GROMACS. It would be great if we can then overwrite on command line like this.

[ekouts]

But sometimes, I may want to run the test just with one particular GROMACS

The parameterize option that @vkarak suggests would still be useful if the new values are not included in the test's parameters, but for many cases selecting the test you like with the -n option may be enough, right?

[vkarak]

Yes, the idea is to be able to override the parameter values completely. That's a superset of what @casparvl requests, but it would still make his scenario much faster if we supported this option. :-) Currently, also what you suggest @ekouts would work fine, and it's much more convenient now with the test hashes as that you can quickly select a test with -n /<hash>. But you still have to pay the cost of creating all the test variants, which can be significant using the find_modules() that interacts with the modules system.