New start, status, stop scripts

Redesign of the startup, stop scripts.

This script serves as an easy way to launch the GekkoFS daemon on multiple nodes via srun.

Script will feature the following functionality:

• A configuration file allowing to set various environment variables and more (e.g., log level or log locations)
• A gkfs shell script which has the following functions:
  • start
  • status
  • stop

Script optional arguments

Most commonly used arguments are used to overwrite default values of config file. Values in < > are default values. (NOT FINAL):

• [-h, --help] help page
• [-r/--rootdir <config>] rootdir path
• [-m/--mountdir <config>] mountdir path
• [--srun <true>] should srun be used to launch on multiple nodes?
• [-n/--numnodes <jobsize>] number of nodes. If not given, reads srun environment. --srun must be true.
• [-a/--auto-sm <false>] toggle Mercury's auto-sm
• [-l/--listen <ib0>] used network device
• [--cpuspertask <64>] number of allowed cpus used by Slurm task. (This can severely impact daemon performance)
• [-v/--verbose <false>] increase verbosity level of script
• [-p/--protocol <config>] used network protocol
• [-c/--config <./gkfs_runtime.conf> config file location if not in the same directory

Script positional arguments

• start: TODO requirements
  • run in foreground
  • run in background
  • run several instances on one node
• status: TODO requirements no longer needed. can be added later
• stop: TODO requirements
  • stop slurm task gracefully

Configuration file

The current configuration file contents are hosted here and can be collaboratively modified to meet our requirements: https://hedgedoc.lefthy.de/s/gkfs_config

Current issues

• Script takes CPUs per process from script launching node and not the deployment node