Timothy,
Thanks for these links. Are these fixes available in the ACDC downloads?
I was told that shared classes should make startup faster. I've been
playing with it and have noticed a few interesting things.
1. I think the default shared classes cache size is 60MB... Ive made it
100MB and it is 93% full ! it would be good if appropriate size was given
in z/OSMF
2. When I start z/OSMF a second time, the SMF 92-11 records show over
1000 jar files are being opened, and some are being opened more than once,
for example /usr/include/java_classes/IRRRacf.jar is being opened 68 times!
1. Shared classes are being used, as I can display the file
information in the shared cache
2. It looks like jar files are >not< being loaded from the shared
classes data space and they are being loaded from the file system.
Are there any magic options to say "load a jar - just once ... not once
for each thread", or to tell Java to load from the shared classes cache?
It feels like an old (non java) problem of having a non reentrant load
module, so it was loaded from disk every time, instead of reusing the
in-memory copy.
Colin
On Thu, 20 May 2021 at 06:00, Timothy Sipples <sipp...@sg.ibm.com> wrote:
> If you're experiencing long z/OS Management Facility startup times then
> please check that you have installed the PTFs for several APARs. You might
> consider disabling the z/OSMF help feature (if you can safely live without
> it) since it represents a substantial fraction of startup time/energy.
> Details are available here:
>
>
> https://community.ibm.com/community/user/ibmz-and-linuxone/blogs/jing-hua-jiang1/2020/10/30/make-your-zosmf-server-starts-significantly-faster
>
> https://community.ibm.com/community/user/ibmz-and-linuxone/blogs/zhi-li1/2020/08/10/tailor-your-zosmf-server-for-better-performance-in
>
> - - - - - - - - - -
> Timothy Sipples
> I.T. Architect Executive
> Digital Asset & Other Industry Solutions
> IBM Z & LinuxONE
> - - - - - - - - - -
> E-Mail: sipp...@sg.ibm.com
>
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