On 15/05/2021 3:03 am, Matt Hogstrom wrote:
It takes z/OSMF about an hour to fully initialize on my ZD&T … same behavior
(lots of SIOs and CPU) IBM says its fixing this but its been quite a while. Its
Java related.
I did some investigation a while back using type 92 SMF records to try
to figure out why z/OSMF was doing about 90,000,000 EXCPs during startup
on my system.
I found that there were many files (mostly doc.zip) where the same file
was opened and closed hundreds or even thousands of times during startup.
Despite this, z/OSMF startup on my system still only took around 1
minute. I have a hypothesis that this might be because the filesystem is
mounted read only - perhaps if the filesystem is read/write last access
times are updated for each open/close, which means write I/Os instead of
cached read I/Os.
Files are e.g.
ation/helps/eclipse/plugins/com.ibm.cpomessages.help.doc/doc.zip
(name is truncated)
Is your filesystem read/write? Does it help if it is read only?
I think IBM has made some improvements since I did the investigation.
Looking now z/OSMF has 29,000,000 EXCP instead of 90,000,000. I probably
should repeat it and see what has changed.
--
Andrew Rowley
Black Hill Software
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