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- Path: news.u.washington.edu!djarvis
- From: djarvis@u.washington.edu (David Jarvis)
- Newsgroups: comp.sys.amiga.applications
- Subject: VMM can't use the partition, just "pagefile"?
- Date: 16 Mar 1996 09:53:55 GMT
- Organization: University of Washington, Seattle
- Message-ID: <4ie33j$ji5@nntp5.u.washington.edu>
- References: <Dnspsw.K5D@exeter.ac.uk> <4i6m1h$mir@lyra.csx.cam.ac.uk> <wulfraedDo7s8L.GCD@netcom.com> <oj6ohq0ai05.fsf@hpsrk.fc.hp.com>
- NNTP-Posting-Host: homer13.u.washington.edu
- NNTP-Posting-User: djarvis
-
- I saw the thread about Virtual memory with no MMU, and I wondered if
- anyone had any similar situation as me with the shareware VMM.
-
- I have a new DKB '030 board with MMU, and I repartitioned my hard drive,
- leaving a 10 M partition for VMM. However, I have not been able to get
- it to use the new partition, but only the "pseudopartition" setting,
- which is limited in size to half of the partition (ie 5M), and still uses
- a pagefile.
-
- It does work, but with those limits.
-
- I would appreciate any suggestions.
-
- David Jarvis
-
- In article <oj6ohq0ai05.fsf@hpsrk.fc.hp.com>,
- Steve Koren <koren@hpsrk.fc.hp.com> wrote:
- >
- >wulfraed@kd6mog.netcom.com (Dennis Lee Bieber) wrote:
- >
- >> Any time you end up swapping to to disk you are going to be slowed
- >> down. At least the Amiga's multitasking I/O means some application can get
- >
- >Yep, that's true. Although there is slightly more to consider. It may
- >not make much of a real performance difference. If you swap out
- >something that is not in the resident set of the current set of
- >processes, the impact is negligible, and you can then use more RAM
- >(without swapping) than you could have otherwise.
- >
- >Example: say I run a commodity from WBStartup that I use only once every
- >few days, but I always want it loaded. Normally this thing sits around
- >taking up RAM. With VM, it can be paged out (once) when there is memory
- >pressure. Thereafter I can use that RAM with no swapping needed. I
- >might access the commodity again tomorrow, but I can probably tolerate a
- >second of paging activity at that point in order to be able to use the
- >extra memory for many hours in the meantime.
- >
- >Don't confuse proper use of VM with thrashing, which *does* slow things
- >down terribly. If used well, VM can have very little impact on the
- >system while letting you use much more memory than you could otherwise.
- >In day-to-day use I don't think my system averages more than one page
- >fault every hour or two. A page fault takes milliseconds, so that's not
- >a real big price to pay in order to be able to allocate 30+ Mb on my 16
- >Mb system.
- >
- > - steve
-
-
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