F66204@BARILVM.BITNET (Shaul Wallach) (03/19/91)
We have obtained longer than expected elapsed times for a benchmark test run of the ab initio molecular orbital program GAMESS on our RS/6000 Model 530 server. The test run makes intensive use of scratch files totaling about 500 Mb of disk space. When IBM ran the benchmark for us, on an empty 530, CPU utilization for the job was very good (ca. 90%). However, on our 530, while the actual CPU time for the job was about the same, CPU utilization was only about 50%, meaning that elapsed time was almost twice as long. We have two 320 Mb and two 670 Mb disks, while IBM also used a 670 Mb disk. We have 64 Mb of memory versus 32 Mb on IBM's machine. While our 530 is connected to other work stations by NFS, all the scratch files for the job are local. Does anybody have any suggestions? Thanks, Shaul Wallach