--------------------------------<snip>-----------------------
Who controls file allocation in your shop? I've seen fairly dramatic
decreases in I/O (and the cpu cycles needed for that I/O) by tuning VSAM
applications. Reduce your I/O by increasing the buffers, eliminate the
cpu cycles used for the eliminated I/O thus freeing up cycles for your
applications. Just a thought.
VSAM defines prepared by Cobol programmers are rarely efficient, at
least in my experience. IMS buffers could be looked at as well.
----------------------<unsnip>-----------------------------
VSAM is not the only beneficiary of tuning I/O. Just shifting to System
Determined Blksize in our shop bought back almost 15% of the CPU time
for our production job mix. The effect on the test/development load was
even more pronounced.
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