python - ipyparallel 异常 : "You have attempted to connect to an IPython Cluster but no Controller could be found"

Question

我刚开始使用 ipyparallel，我正在使用 VS2017 并将其导入为；

import ipyparallel as ipp

然后尝试使用;

def main():
    rc = ipp.Client()


if __name__ == "__main__":

    main()

在 python 窗口中，我收到消息:“等待连接文件:~.ipython\profile_default\security\ipcontroller-client.json”

它卡在 rc = ip.Client() 行并给出问题中的异常。该位置似乎没有任何名为 profile_default 的文件，更不用说 json 文件了。

有人知道如何解决这个问题吗？

Answer 1

如果没有集群在运行，则会出现此错误。

import ipyparallel as ipp
rc = ipp.Client()

这是错误信息:

Waiting for connection file: ~/.ipython/profile_default/security/ipcontroller-client.json

---

OSError Traceback (most recent call last) in ----> 1 rc = ipp.Client() OSError: Connection file '~/.ipython/profile_default/security/ipcontroller-client.json' not found. You have attempted to connect to an IPython Cluster but no Controller could be found. Please double-check your configuration and ensure that a cluster is running.

这是一个显示正在运行的集群的函数:

def show_clusters():
    clusters = ipp.ClusterManager().load_clusters() 
    print("{:15} {:^10} {}".format("cluster_id", "state", "cluster_file")) 
    for c in clusters:
        cd = clusters[c].to_dict()
        cluster_id = cd['cluster']['cluster_id']
        controller_state = cd['controller']['state']['state']
        cluster_file = getattr(clusters[c], '_trait_values')['cluster_file']
        print("{:15} {:^10} {}".format(cluster_id, controller_state, cluster_file))
        

在这种情况下，没有集群在运行。

show_clusters()
# cluster_id        state    cluster_file

在 Jupyter 笔记本中，可以为集群启用一个选项卡(ipcluster nbextension enable)。这是没有集群运行时的样子:

启动集群

cluster = ipp.Cluster(n=4)
await cluster.start_cluster() # or cluster.start_cluster_sync() without await
# Using existing profile dir: '/Users/X/.ipython/profile_default'
# Starting 4 engines with <class 'ipyparallel.cluster.launcher.LocalEngineSetLauncher'>

show_clusters()
# cluster_id        state    cluster_file
# 1648935811-e7r2  running /Users/X/.ipython/profile_default/security/cluster-1648935811-e7r2.json

现在您可以使用集群 ID 定义客户端:

rc = ipp.Client(cluster_id='1648935811-e7r2')

这是启动集群后 Jupyter notebook 集群选项卡的样子:

如果您从 Jupyter notebook 选项卡启动默认集群(不确定如何在命令行上执行此操作)，命令 rc = ipp.Client() 也可以在没有集群的情况下工作编号。