While there have been several proposals of high performance global
computing systems, scheduling schemes for the systems have not
been well investigated.  The reason is difficulties of evaluation by
large-scale benchmarks with reproducible results. 
Our Bricks performance evaluation
system 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.  Experiments were conducted by running NWS under a real
environment versus the simulated environment given the observed
parameters of the real environment.  We observed that Bricks behaved 
in the same manner as the real environment, and NWS also behaved
similarly, making quite comparative forecasts under both environments.