--shm-size=256m should be ok if you running directly from docker. But if you are using kubernetes then you need to do this https://github.com/Uninett/helm-charts/blob/master/repos/stable/deep-learning-tools/templates/deployment.yaml#L41 and then mount it as https://github.com/Uninett/helm-charts/blob/master/repos/stable/deep-learning-tools/templates/deployment.yaml#L171
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