home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!saimiri.primate.wisc.edu!crdgw1!rpi!utcsri!helios.physics.utoronto.ca!alchemy.chem.utoronto.ca!system
- From: system@alchemy.chem.utoronto.ca (System Admin (Mike Peterson))
- Newsgroups: comp.sys.hp
- Subject: Re: HP 7xx problem with virtual memory (thrashing)
- Keywords: virtual memory thrashing
- Message-ID: <1993Jan3.034944.3556@alchemy.chem.utoronto.ca>
- Date: 3 Jan 93 03:49:44 GMT
- References: <1992Dec31.193847.6419@csi.com>
- Distribution: comp.sys.hp
- Organization: University of Toronto Chemistry Department
- Lines: 28
-
- In article <1992Dec31.193847.6419@csi.com> bkp@csi.com (Brian K. Pheiffer) writes:
- >
- >I have found a serious deficiency with the HP-UX memory management and
- >was wondering if anyone else has seen this problem: whenever a process
- >require more memory than the amount of physical RAM that the system has,
- >the HP-UX operating system (8.05,8.07 & 9.0) start ``thrashing'', a
- >term HP uses to mean that the disk continues to swap indefinately
- >while the process makes no progress!
- >HP mentioned that it solved this problem with HP-UX 9.0, however, we
- >haven't seen that to be true. Does anyone else know about this
- >problem?
-
- I reported this problem on 8.07 last June, and have tried several
- patches, including the one for 8.07 that is supposedly based on the
- 9.0 swap/paging algorithms. None of them have made any difference.
-
- Our "solution", which seems to have worked so far, was to buy
- enough 3-rd party memory (192MB), then only allow 1 task to run at a time,
- with the user data size set to 128 MB max. This way one process
- can not steal all the physical memory, though 2 or more could
- gang up and do it. Our system would die within a week with 128 MB
- memory.
-
- This is a pathetic state for a modern technical/scientific workstation :-(.
- --
- core error - bus dumped -*- Mike Peterson, SysAdmin, U/Toronto Chemistry
- ******* As usual, I speak only for me, myself and I; nobody else *******
- E-mail: system@alchemy.chem.utoronto.ca Tel: (416)978-7094 Fax: (416)978-8775
-