MOM6 OpenMP support not working (ocean_only benchmark)

[puneet336]

Hi,
I had compiled MOM6 by setting OPENMP = on in the config template files using intel compilers (2019u5).
while trying the launch config of 28 ranks x 2 threads per rank i noticed that the threads are not being launched (monitored processes for entire duration of run using top), here is the snapshot of what i observed -

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND

872167 user1    20   0 4916068 496352 135928 R 100.0   0.3   1:19.43 MOM6

872168 user1    20   0 4910696 485280 134636 R 100.0   0.2   1:19.45 MOM6

872171 user1    20   0 4920744 494296 137556 R 100.0   0.3   1:19.52 MOM6

872174 user1    20   0 4922224 497292 137500 R 100.0   0.3   1:19.51 MOM6

872183 user1    20   0 4904688 489716 134632 R 100.0   0.2   1:19.55 MOM6

872184 user1    20   0 4916528 493556 134332 R 100.0   0.3   1:19.48 MOM6

872162 user1    20   0 4993096 569064 207580 R  99.7   0.3   1:16.86 MOM6

872163 user1    20   0 4930392 497904 136572 R  99.7   0.3   1:19.50 MOM6

872164 user1    20   0 4944180 496488 135184 R  99.7   0.3   1:19.42 MOM6

872165 user1    20   0 4936960 490484 135308 R  99.7   0.2   1:19.45 MOM6

872166 user1    20   0 4915968 497968 135960 R  99.7   0.3   1:19.46 MOM6

872169 user1    20   0 4920508 493160 137136 R  99.7   0.3   1:19.44 MOM6

872172 user1    20   0 4917964 491684 136776 R  99.7   0.3   1:19.52 MOM6

872173 user1    20   0 4920084 498832 138652 R  99.7   0.3   1:19.45 MOM6

872175 user1    20   0 4920440 497424 135300 R  99.7   0.3   1:19.46 MOM6

872177 user1    20   0 4920572 498236 135900 R  99.7   0.3   1:19.54 MOM6

872178 user1    20   0 4920744 494464 136588 R  99.7   0.3   1:19.54 MOM6

872179 user1    20   0 4899664 484792 135700 R  99.7   0.2   1:19.52 MOM6

872180 user1    20   0 4918696 490188 134212 R  99.7   0.2   1:19.47 MOM6

872181 user1    20   0 4922620 495444 137224 R  99.7   0.3   1:19.53 MOM6

872182 user1    20   0 4920572 495668 133368 R  99.7   0.3   1:19.57 MOM6

872185 user1    20   0 4919600 494836 136044 R  99.7   0.3   1:19.54 MOM6

872186 user1    20   0 4902864 480148 134468 R  99.7   0.2   1:19.53 MOM6

872187 user1    20   0 4919600 491800 134604 R  99.7   0.3   1:19.53 MOM6

872188 user1    20   0 4922808 495000 134556 R  99.7   0.3   1:19.52 MOM6

872189 user1    20   0 4902192 486496 134724 R  99.7   0.2   1:19.49 MOM6

872170 user1    20   0 4924668 501076 136768 R  99.3   0.3   1:19.46 MOM6

872176 user1    20   0 4920176 499420 137552 R  99.3   0.3   1:19.46 MOM6

I am able to see following in the stdout, so i assume that OpenMP support has been enabled in the code -

NOTE from PE     0: fms_affinity_set: OCEAN affinity assumes hyper-threading hardware disabled
MOM_domains_mod OMPthreading 22 0 1

Do i need to carry out any modification in the input file to get the Hybrid (OpenMP + MPI) runs to work correctly?
please advice.