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- From: isbell@cats.ucsc.edu (Art Isbell)
- Newsgroups: comp.sys.next.misc
- Subject: swapfile compression
- Message-ID: <17oqh9INN92p@darkstar.UCSC.EDU>
- Date: 29 Aug 92 21:34:33 GMT
- References: <15175@umd5.umd.edu> <dillon.0mmg@overload.Berkeley.CA.US> <1992Aug29.145719.9180@nic.umass.edu>
- Organization: Cubic Solutions - NeXT software development and consulting
- Lines: 28
- NNTP-Posting-Host: am.ucsc.edu
-
-
- In article <1992Aug29.145719.9180@nic.umass.edu> a74k110@titan.ucc.umass.edu (Chris Lloyd) writes:
- >Uh, I *REALLY* Don't think compress=lzw/packbits/etc. That would be totally
- >retarded, not to mention totally unuseable on an '030 and damn near it on an
- >'040. I would gather compressed = compacted in that the holes in the swapfile
- >are reused more wisely and the paging system tries to keep the swapfile
- >to a minimum ...
- >
- >This growing rumor is totally unfounded and technically silly IMNSHO.
-
- I heard a NeXT engineer speak at a BANG Developer SIG a few months ago. He was
- talking about app performance tuning. He suggested that developers choose to
- load up the CPU rather than memory when possible since CPU speeds are
- increasing much faster than memory access speeds, especially when memory access
- is from a hard disk for paged/swapped data/code. An example he cited was 3.0's
- swaptimizer which compresses paged/swapped pages (requires more CPU resources
- but uses less memory resources). But he said that the swaptimizer was active
- only on NeXT machines with mininal RAM (8 MB mono, 12-16(?) MB color) because
- the CPU-memory trade-off wasn't so critical on machines with more RAM.
-
- So unless NeXT has changed 3.0's swaptimizer (certainly a possibility), I'd say
- this is not a totally unfounded rumor.
- --
-
- Art Isbell Cubic Solutions
- NeXT Registered Developer #745 NeXT software development and consulting
- Email: isbell@cats.UCSC.EDU Voice: (408)335-1154
- USmail: 95018-9442 Fax: (408)335-2515
-