A research on general puropose parallel operating systems for 
distributed or parallel multiprocessor environment,
such as NUMA multiprosessor or workstation clustered systems, is done.
The aim is to achieve the efficeint concurrent execution of
multiple parallel applications in such systems.

2-level scheduling, in which scheduling is divided into user-level and
kernel-level, is useful in multiple parallel environment.
It is so powerful and allocating resources without violating applications'
parallelism and using scheduling informations from user-level
lead to a practical general puropose multiple parallel OS.

In the paper, we propose a kernel level scheduling method for a 2-level 
scheduling policy that takes advantage of informations on hierachical 
system structure and memory usage of each applicaton.
Furthermore, its efficiency is evaluated by simulation studies and compared
to other scheduling alternatives.

Reflecting the memory usage of each process to kernel-level scheduling,
processes effectively migrate in complicated systems
where memory accesses are nonuniform.
Thus system performance can be enhanced.
Moreover, kernel can use the hierarchical system structure to 
allocate resources according to scheduling constraints of processes.