> John McKown Wrote: > > I'm ignorant of this. But did a search in IBMLink. > > It appears that there are "shared libraries" in z/OS UNIX which are loaded somewhere? > (not documented where). The size of this area is specified in the SHRLIBRGNSIZE > parameter. The load modules loaded into this area are .so UNIX "dynamic subroutines" > which are marked as shareable in the filesystem via the "+l" extattr attribute. This > area is them mapped into every UNIX address space into "high private". I would guess > this would eventually involve IARVSERV. > http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IEA2A9B0/5.0 > and > http://publibz.boulder.ibm.com/cgi- > bin/bookmgr_OS390/BOOKS/IEA2A6A1/20.0?SHELF=IEA2BKB2&DT=20101208204043 > > The larger the area, the more high private is lost in every UNIX address space which > attempts to load a shared library. And the more ECSA is used for mapping tables. > > It appears that if it is too small, it is not used at all and each shared library is loaded > into the user's address space as if it were not shared. This increases I/O. > > So I guess "shared library" region size is like an LLA for UNIX shared libraries. But I > don't read of any way for "obsolete" modules to be purged and their storage > reclaimed. And there doesn't appear to be any way to actually determine what is > loaded. I would guess into some address space or data space controlled by the UNIX > kernel.
John and Mike Thanks. I guess this is going to be an ETR to IBM. I am not sure how to monitor or identify when more is better or if I can use less. This happened after an IPL, so I am sure that there are new "UNIX" functions and it tipped it over this limit. However, with the lack of research tools (we do D OMVS,L every hour), it is close to impossible for me to do any type of capacity management on this area. I would hope that IBM has tools to list the shared libraries, modules, usage type information rather than just a blanket - so much storage available so much storage used. To me that is just asking for an outage of a Unix process or system failure of some kind. If I turn up anything with IBM I will let you know. This is not something I just want to blindly increase as the documentation is not clear on how my overall system performance is going to be impacted. Thanks for the help Lizette ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
