Significantly improve configuration file format

[marcusmueller]

RFC 2119 applies.

• file format SHOULD document what version of VOLK and compiler information for each benchmark entry
• file format MUST include version number
• file format SHOULD allow for multiple, separate configurations based on matching either machine identifier (/etc/machine-id) or regex against a CPU identifier

[jdemel]

A couple of entries:

• MUST include a volk_config_version field (at the top-level)
• MUST include a configurations entry that is a list of configurations
  • The configurations list SHOULD contain at least one configuration
• A configuration MUST include the following fields
  • volk_version that was used to create the configuration
  • volk_machine that was used to create the configuration
• A configuration SHOULD include the following fields
  • exact CPU identifier that was used to create the configuration
  • an architecture entry [x86, aarch64, armv7, riscv, ppc64le, ...]
  • A compiler entry with name and version, e.g., gcc 13.1
  • A list kernels that contains the following entries
    • name
    • aligned
    • unaligned

These are the entries that would improve the VOLK configuration. Also, it would make this file exchangeable and usable on multiple machines.

[DhanashreePetare]

I would like to work on the issue. Can you please assign it to me.

[jdemel]

Happy new year! Sure.