Recent developments of global computing systems such as Ninf, NetSolve,
and Globus have opened up the opportunites for providing
high-performance computing services over wide-area networks.
However, most research focused on the individual architectural aspects
of the system, or application deployment examples, instead of critical
issues regarding system performance characteristics in global computing.
Further, no step-by-step analysis or impartial comparison of various
scheduling schemes has been conducted, though the performance and
feasibility of a global computing system, which employs a large number
of computational resources, highly depends on its scheduling scheme.
Evaluation is made difficult by large-scale benchmarks and the need for
reproducible results.
Our comparative study performs deployment of example applications of
network-based libraries using Ninf, NetSolve, and CORBA systems.
There, we discover that dedicated systems for global computing such as
Ninf and NetSolve have in some cases performance advantages over more
generic distributed computing capabilities provided by CORBA. 
Also, we proposed the Bricks performance evaluation system, which would
allow analysis and comparison of various scheduling schemes on a typical
high-performance global computing setting. Bricks can simulate various
behaviors of global computing systems, especially the behavior of
networks and resource scheduling algorithms.
Moreover, Bricks is componentalized such that not only its constituents
could be replaced to simulate various different system algorithms, but
also allows incorporation of existing global computing components via
its foreign interface.
To test the validity of the latter characteristics, we incorporated the
NWS system, which monitors and forecasts global computing systems
behavior.