SSS-CORE is a general purpose scalable
operating system for NUMA parallel distributed systems.
It provides very efficient multi-tasking environment 
with timesharing and space partitioning.
Furthermore, it tries to allow each parallel 
application to achieve maximum performance by cooperation of user and
kernel level resource allocation and scheduling and by offering
low-latency high-throughput memory based communication facilities.
SSS-CORE also provides a low-overhead mechanism that 
allows information transfer between kernel and user level.
In this paper we describe the structure of the SSS-CORE kernel,
light-weight system-calls, memory-based FIFOs and memory-based
signals. Finally we show the basic performance of the SSS-CORE
Ver.1.1 system which has been developed from scratch.