Fix multi-node hang issue

[litaotju]

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[litaotju]

@lfr-0531 @yuxianq the mpi barrier on the weights prefetch is causing multi-node to hang, we need to remove this.

[yuxianq]

the mpi barrier on the weights prefetch is causing multi-node to hang, we need to remove this.

@litaotju How about using local barrier instead to avoid multi-gpu hang? Since each node need to prefetch the whole checkpoint, using local barrier is enough. Here is the PR: #12

[litaotju]

the mpi barrier on the weights prefetch is causing multi-node to hang, we need to remove this.

@litaotju How about using local barrier instead to avoid multi-gpu hang? Since each node need to prefetch the whole checkpoint, using local barrier is enough. Here is the PR: #12

Would there be issues if we don't do this barrier at all? The prefetch is only affecting the current process right?