Backport zmq leaks fix for MultiKernelManager #555
Merged
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This is a backport of a portion of PR #548. Specifically, we use a shared ZMQ context (by default) from the
MultiKernelManager
that, when enabled, uses the same context across allKernelManager
instances. The portion not backported is the ability to create (and destroy) a ZMQ context perKernelManager
.