The intention of this talk is to provide an introduction together with
usage examples to the IHK/McKernel lightweight multi-kernel operating
system on Oakforest-PACS. The presentation starts with a brief introduction
to McKernel, which runs Linux and a lightweight kernel side-by-side on
compute nodes. The basic idea of this OS structure is to provide
light-weight kernel scalability and Linux compatibility at the same time.
To demonstrate McKernel's performance characteristics, we provide results
on a number of mini-applications running on full-scale OFP. This is
followed by a users' guide to the configuration knobs of the system with
explicitly focusing on the details of job execution on Oakforest-PACS. Towards
the end, the talk will provide a more throughout discussion on operating
systems research in high-performance computing (HPC) with a historical overview
of the forces that shaped HPC OS research, including lightweight kernels
and multi-kernels. Finally, we discuss some of the implementation details
of IHK/McKernel.