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Environment Variables

  • ARK_ROOT (Default: /usr/local/ark)

    The installation directory of ARK. For C++, defaults to /usr/local/ark when unset. For Python, defaults to the ARK Python module's path.

  • ARK_LOG_LEVEL (Default: INFO; Options: DEBUG, INFO, WARN, ERROR)

    The log level of ARK. Use DEBUG for verbose debugging information and use ERROR for quiet execution.

  • ARK_TMP (Default: /tmp/ark)

    A directory to store temporal files that ARK generates.

  • ARK_KEEP_TMP (Default: 1; Options: 0, 1)

    If set to 1, do not remove temporal files in the ARK_TMP directory, vice versa.

  • ARK_HOSTFILE (Default: ${ARK_ROOT}/hostfile)

    Path to a hostfile. Need to set for multi-node execution. Ranks will be assigned in the order that hosts appear in the hostfile (ARK_NUM_RANKS_PER_HOST ranks per host).

  • ARK_NUM_RANKS_PER_HOST (Default: 8)

    The number of ranks that each host runs. The behavior is undefined if the total number of ranks is not a multiple of ARK_NUM_RANKS_PER_HOST.

  • ARK_DISABLE_IB (Default: 0; Options: 0, 1)

    If set to 1, disable ibverbs networking (i.e., disable multi-node execution).