p par task comp only, no comm, homogeneous

$ simdag/partask/test_comp_only_par simdag/partask/platform_2p_1sl.xml --log=sd_kernel.thres=warning
> 1

p par task comp only, no comm, heterogeneous

$ simdag/partask/test_comp_only_par simdag/partask/platform_2p_1sl_hetero.xml --log=sd_kernel.thres=warning
> 1