OccamConnector

The Occam SuperComputer is a High-Performance Computing (HPC) facility designed and managed in collaboration between the University of Torino (UniTO) and the National Institute for Nuclear Physics (INFN).

It is different from standard HPC facilities for two main reasons. First, users can reserve computing nodes for specific time slots instead of relying on a batched interaction orchestrated by a queue manager. Second, the execution model is entirely based on unprivileged Docker containers.

This connector allows StreamFlow to offload computation to multi-container environments deployed on the Occam facility. The deployment unit is a multi-container environment deployed on one or more computing nodes. Multi-container environments are described in a YAML file with a syntax similar to the service section of Docker Compose. Users can pass this file to the connector through the file parameter. The unit of binding is the single top-level entry in the file, while the scheduling unit is the single container instance.

properties
file (required)	Path to the file describing Occam environment
	type	string
sshKey (required)	Path to the SSH key needed to connect with Occam environment
	type	string
username (required)	Username needed to connect with Occam environment
	type	string
hostname	Hostname of Occam facility
	type	string
	default	occam.c3s.unito.it
sshKeyPassphraseFile	Path to a file containing the passphrase protecting the SSH key
	type	string
transferBufferSize	Buffer size allocated for local and remote data transfers
	type	integer
	default	16kiB