home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.intel
- Path: sparky!uunet!van-bc!sl
- From: sl@wimsey.bc.ca (Stuart Lynne)
- Subject: Re: Overdrive for the 486/50??
- Organization: Wimsey Information Services
- Date: Sun, 20 Dec 1992 02:23:48 GMT
- Message-ID: <BzJDBp.BLy@wimsey.bc.ca>
- References: <8f9__KS00WB5Qu_ogq@andrew.cmu.edu> <1992Dec15.141953.21972@dvorak.amd.com> <1992Dec15.162702.16600@walter.bellcore.com>
- Lines: 37
-
- In article <1992Dec15.162702.16600@walter.bellcore.com> ngai@nova.bellcore.com (John Ngai) writes:
- >
- >In article <1992Dec15.141953.21972@dvorak.amd.com>, tdbear@dvorak.amd.com (Thomas D. Barrett) writes:
- >|> In article <8f9__KS00WB5Qu_ogq@andrew.cmu.edu> fj05+@andrew.cmu.edu (Faisal Nameer Jawdat) writes:
- >I watched this thread for a while, but am surprised no one points out an
- >important reason of why you don't want to replace a DX50 with the DX2/66.
- >The question one should ask is what performance do I gain? For all I have read
- >and heard, the two chips delivers roughly the same *average* performance in
- >most real applications. After you sum up the balance of on-chip and off-chip
- >activities, it is simply about the same. Unless you are doing some
- >computationally intensive task that are small enough to reside entirely in the
- >on-chip cache, it is simply not worth it to swap.
-
- Well here is a test you can try for yourself at home.
-
- I selected a moderately large file and tried:
-
- time compress < bigfile > /dev/null
-
- on two machines here. One of which has a DX-50 and one of which has a DX2-66.
- In other respects the machines are fairly similiar. EISA based, moderately
- fast SCSI based disks with 1742 controllers, 32MB of memory, both running
- SCO 3.2.4 etc.
-
- The DX2-66 was about 1.21 times faster than the DX-50 when comparing the
- user time.
-
- I consider this to be fairly worthwhile on this machine. From my accounting
- reports I see that compress recorded 46 CPU minutes over the last day. This was
- slightly over 10% of total for the day. The only larger total was for uucico
- which was higher but spread over a much longer real time.
-
- --
- Stuart Lynne <sl@wimsey.com> ......................... UNIX Facsimile Software
- Wimsey Information Technologies ................... moderator biz.sco.binaries
- uucp login:nuucp passwd:nuucp .................... ftp.wimsey.com:~ftp/ls-lR.Z
- PD Software for SCO UNIX .................... ftp.wimsey.com:~ftp/pub/wimseypd
-