PPT Slide
3. Comparison of Processing Capability by VPP Fortran and HPF/JA
The vector mode with 1PE is about 40 times faster than the scalar mode.
Computation speed of HPF/JA is almost comparable to that of VPP Fortran.
Scalability of parallel computation is well satisfied as is given that the
computation speed is roughly proportional to the number of PEs.
The scalability is greatly improved when we choose the number of grid
points as nx*ny*nz=200*100*478 (nz2=nz+2=480=2**5*3*5) and
800*200*670 (nz2=672=2**5*3*7).
High performance beyond 400 Gflops was achieved in both cases of VPP
Fortran and HPF/JA when we chose a large number of grid points given by
nx*ny*nz=1000*500*1118 and 1000*1000*1118, where nz2=1120=2**5*5*7
keeps an integer times the number of PEs.
A 3D global MHD simulation of the earth's magnetosphere can achieve a
high efficiency of 76.5% in the absolute measurement of vector and
parallel computation using 56 PEs of the Fujitsu VPP5000/56.