Improving CPU Usage

Consider the following for improving CPU usage:

Number. Add more processors. If you want to approach the speed that a user would experience when running IBM® SPSS® Statistics locally, try to have one processor for every two concurrent users. Also use processors that are as fast as, or faster than, the processor on the desktop computer. For example, if you expect an average of four concurrent users, configure the server computer with two fast processors.

Hardware. Use fast processors. Adding a few really fast processors is better than adding many slow ones. If CPU usage is still a problem with fast processors, consider adding more server computers to your system.

SAV file locations and access. If certain files are used often by many concurrent users, consider moving the files across multiple servers to balance the user load. For example, if TestScores.sav and GPA.sav are both heavily used, put them on separate servers. Control access to the files with the operating system permissions (per group or per user) instead of controlling access through server accounts.

CPU priority. If certain users need a higher CPU priority than other users (for example, users who run quick jobs versus those who run long jobs), modify the user profile or group settings. See the topic IBM SPSS Statistics Server User Profiles and Groups for more information.

Cache compression. Cache compression has some CPU overhead for the compression and decompression of scratch files. If your users are not working with large data files, you may want to consider turning it off. See the topic Users for more information.