  We have developed Remote-GRAPE, a subroutine library to use the special
purpose computer GRAPE-3A. The GRAPE-3A can efficiently calculate gravitational
force between particles, and construct neighbor lists. All other calculations
are performed on the host workstation (WS) which is directly connected to
GRAPE. The use of GRAPE for Smoothed Particle Hydrodynamics (GRAPE-SPH) can in
principle greatly speed up the calculations on WS. However the current
bottleneck of GRAPE-SPH is that its performance is limited by the speed of the
host WS. To solve this problem, we implement Remote-GRAPE; it allows us to run
applications which use GRAPE-3A hardware on the significantly faster computers
than the physical host WS. Thus, we can take advantage of the fast computers
even though they can not physically be connected to GRAPE. The Remote-GRAPE
system is implemented on the Parallel Virtual Machine (PVM). In this paper, the
detail of implementation and performance analysis are described.
