Reducing DISK I/O z/OS 1.4

pts.
Tags:
z/OS
z/OS configuration
z/OS migration
z/OS optimization
I have a C loadmodule that is called 1000's of times a day. The first action it takes is to open a PDS with 41 members and read them. This PDS's members are only "text", no load modules. I would like to know in what way I could cache them in memory and totally bypass DASD disk I/O. Thank you, John Fly

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Thanks. We'll let you know when a new response is added.

You might look into the Virtual Lookaside Facility (VLF).
Some good introduction can be found in:

z/OS: MVS Programming: Authorized Assembler Services Guide
? Copyright IBM Corp. 1988, 2002

Document number . . : SA22-7608-03

The area in which our company is using VLF is repeatedly retrieved Rexx execs. ISPF/DM objects are localy cached so they are no good candidates for VLF.

Testing revealed an elapsed time improvement on the I/O of a factor 3.

With kind regards,
Eric-Jan Hoogendijk.

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