× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.




On Wednesday, February 4, 2004, at 08:19 PM, McCallion, Martin wrote:


I thought the temporary addresses were cleared at IPL and the permanent
ones were not. However, don't forget we're talking about a 64-bit
address space; doesn't that mean there are more addresses available than
the number of atoms in the Universe, or something?

Temporary addresses are cleared during an IPL but the system uses some of them for internal objects during the IPL so it will never be zero.


The 64-bit address space is chopped into quarters: 25% for temporary objects, 25% for permanent objects whose virtual address matches the real address, 25% for other permanent objects, and 25% not used. This reduces the actual address space quite a bit but not enough to worry about.

If temporary addresses are being consumed quickly it usually indicates an application problem (but might be caused by a defect in a licensed program such as SQL).

OK, I admit, the rate we are using the % temp addressis is
around 0.5%/month
and before anything serious can occur, we are likely to
upgrade the OS

So (if that rate of growth remains constant) it would take 200 months to
go from zero to 100%; that's over sixteen years. You'll have upgraded
the _hardware_ long before that, never mind the OS. Though I speak as
one looking at a development partition which is currently showing % perm
addresses 0.018 and % temp addresses 0.042, so it's easy to be
complacent.

It's a bit like being worried by the fact that the IPL count forms part of an objects address. The count is a 2-byte number so allows for 65535 IPLs which at 1 per day means you would have a problem in 179 years.


Regards,
Simon Coulter.
--------------------------------------------------------------------
   FlyByNight Software         AS/400 Technical Specialists

   http://www.flybynight.com.au/
   Phone: +61 3 9419 0175   Mobile: +61 0411 091 400        /"\
   Fax:   +61 3 9419 0175                                   \ /
                                                             X
                 ASCII Ribbon campaign against HTML E-Mail  / \
--------------------------------------------------------------------



As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.