ucc_lib_get_attr doesn't produce output

[marsaev]

After lib handle is created I want to confirm that thread support level is the one that I've requested. However code below:

        ucc_lib_params_t lib_params = {0};
        lib_params.mask = UCC_LIB_PARAM_FIELD_THREAD_MODE;
        lib_params.thread_mode = UCC_THREAD_MULTIPLE;
        CHECK_UCC(ucc_init(&lib_params, lib_config, &lib));

        ucc_lib_attr attrs;
        CHECK_UCC(ucc_lib_get_attr(lib, &attrs));
        printf("UCC thread mode is: %d\n", attrs.thread_mode);
        printf("Available thread modes: UCC_THREAD_SINGLE=%d, UCC_THREAD_FUNNELED=%d, UCC_THREAD_MULTIPLE=%d\n",
            UCC_THREAD_SINGLE, UCC_THREAD_FUNNELED, UCC_THREAD_MULTIPLE);

outputs:

UCC thread mode is: -591294464
Available thread modes: UCC_THREAD_SINGLE=0, UCC_THREAD_FUNNELED=1, UCC_THREAD_MULTIPLE=2

If I initialize attrs with zeros: ucc_lib_attr attrs = {0}; output will be zero, but it feels like ucc_lib_get_attr just doesn't write to ucc_lib_attr output parameter at all.

UCC and UCX versions from HPC-X 2.14

[Sergei-Lebedev]

I think you missed attrs.mask. UCC will skip this field if mask is not set properly.

ucc_lib_attr attrs;
attrs.mask = UCC_LIB_ATTR_FIELD_THREAD_MODE;