cleanup: more compact code; rem_marker is contained in host_os_dict
cleanup: more compact code; rem_marker is contained in host_os_dict

ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env,ctuning/ck-env