OpenExtensions for z/VM "Q"s and "A"s

Question: Do memory requirements increase with OpenExtensions for z/VM?

Answer: This is a particularly hard question to answer, since it depends on several factors:

  • How many processes do you expect to support?
  • Where will the shell and C RTL modules reside? To minimize storage usage, place these in shared segments.
  • What are your users doing with OpenExtensions Services? In general, an OpenExtensions shell user will need a little more storage than the average CMS user. There will be wide ranges of storage usage depending on whether the user is doing lots of compiles or just editing a file.
  • The number of processes, number of open files descriptors (including socket file descriptors), and the amount of activity on the files all affect the amount of storage used.

We are interested in hearing your experiences with sizing storage. We frequently use feedback from users to improve on our documentation.


For more questions and answers, go to our archive of questions and answers.