Fail to run the example

[YaoJiayi]

Running the python example under examples/ will result in "nixl._bindings.nixlBackendError: NIXL_ERR_BACKEND"

Using NIXL Plugins from:
/home/ubuntu/anaconda3/envs/nixl-integration/lib/python3.11/site-packages/.nixl.mesonpy.libs/plugins/
Loaded plugin UCX_MO
Loaded plugin UCX
Traceback (most recent call last):
  File "/home/ubuntu/jiayi/nixl/test/python/nixl_api_test.py", line 32, in <module>
    nixl_agent1 = nixl_agent("target")
                  ^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/anaconda3/envs/nixl-integration/lib/python3.11/site-packages/nixl/_api.py", line 89, in __init__
    self.backends[bknd] = self.agent.createBackend(bknd, init)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
nixl._bindings.nixlBackendError: NIXL_ERR_BACKEND

[tstamler]

Hi @YaoJiayi this issue seems to be rising from just initializing the backend. This example uses the UCX backend by default. How are you building/installing NIXL for this example, and how did you install UCX? Thanks!

[thesues]

I met the similar issue. it could be 'ucx does not support multithread'. You have to follow Dockfile's instructions not the README.md.
build ucx like this:

    ./autogen.sh && ./configure     \
        --enable-shared             \
        --disable-static            \
        --disable-doxygen-doc       \
        --enable-optimizations      \
        --enable-cma                \
        --enable-devel-headers      \
        --with-cuda=/usr/local/cuda \
        --with-verbs                \
        --with-dm                   \
        --with-gdrcopy=/usr/local   \
        --enable-mt &&              \
    make -j &&                      \
    make -j install-strip &&        \
    ldconfig

[mkhazraee]

Hi Jiayi, any updates? Did the ucx rebuild fix the issue?