An SSH connection is created for each input file to be copied to the VM

[NicholasMy]

In the current design, a new SSH connection is established for each file being copied into the VM.

Tango/vmms/distDocker.py

Lines 205 to 218 in 34c6ca7

	for file in inputFiles:
	ret = timeout(["scp"] + DistDocker._SSH_FLAGS + vm.ssh_flags +
	DistDocker._SSH_AUTH_FLAGS + [file.localFile] +
	["%s@%s:%s/%s" % \
	(self.hostUser, vm.domain_name, volumePath, file.destFile)],
	config.Config.COPYIN_TIMEOUT)
	if ret == 0:
	self.log.debug('Copied in file %s to %s' %
	(file.localFile, volumePath + file.destFile))
	else:
	self.log.error(
	"Error: failed to copy file %s to VM %s with status %s" %
	(file.localFile, vm.domain_name, str(ret)))
	return ret

Grading could be greatly sped up if multiple files were copied with one connection rather than wasting time closing and reopening the connection.