Re: Mathematica 2.0 & Mac sys7

*To*: mathgroup at yoda.physics.unc.edu*Subject*: Re: Mathematica 2.0 & Mac sys7*From*: gaylord at ux1.cso.uiuc.edu*Date*: Thu, 30 Apr 1992 03:04:26 -0500

Robert Sierra writes: >Actually, the problem you describe may not have anything to do >with Mathematica (per se). I've been using Mathematica frequently >using 80MB virtual partitions to do extensive 100-200 frame >animations (that often eat up 24 hours of CPU time), and I've never >encountered the type of crash you're talking about. I would suggest that the problem >is in the operating system, and there may be a simple solution to >the problem, independent of Mathematica. I *strongly* suspect the problem >is that MMA crashes when 32-bit addressing is enabled, which >would be the same case regardless of whether you were using >virtual memory or internal memory. Try turning it off (if you >only need a 12MB partition, you don't need 32-bit addressing. >If this doesn't help, look to your INITs, CDEVs, etc. I think >you may find the problem has to do with one of these. >Suggestions: >- Try going back to 24-bit addressing -- see if the problem goes >away. >- Disable all INITs/CDEVs and try again. > >Has anybody else encountered this type of problem? >If so, Was Virtual Memory enabled? > Was 32-bit addressing enabled? > What type of Mac was it? > Which system version? > Which MMA version? > What other INITs and CDEVs were active? ===================================================== i absolutely agree. I think it is a system 7 problem.its not a Mathematica problem per se but i would say that its a problem for Mathematica running under system 7. i don't have much hope that apple will straighten it out (frankly i don't think they have total control over their os as evidenced by the successive tuneup fiascos). running under 24 bit is a obviously not a great solution, though it may be necessary). i would say that the system 7 virtual memory is definitely inferior to the old Connectix (which i was a beta tester for). under system 6, you could lock the hard drive (we did this in the student lab to prevent people from loading games and from trashing programs) and still use virtual memory but under system 7 and apple's virtual you can't. the 32 bit addressing could well be the problem; but i would guess, that it lies not in Mathematica itself running alone under 32 bit addressing but perhaps an init/cdev or application running alongside it under 32 bit adddressing (possibly even my MacWrite II which was not upgraded for system 7). can any of the people who have been experiencing the Mathematica crashes comment on this 32 bit analysis. i've been contacted by wri about what's happening. i responded as indicated below. thanks for anyone wanting to help figure out what's going here. ====================================================================== the response to my note on the net has ndicated that this is a major problem for mac users. system 7 and even more so system 7 with tuneup 1.1 and 1.1.1 are completely screwing up the program. it is very, very common for me to be just sitting around with Mathematica open but not doing any calcluation and when I decide what to do and click on a notebook merely to open it i get a "the application Mathematica has unexpectedly quit due to an error of the type X " where X is any of a number of different numbers. other reports to me indicate that the mac version is consuming and not letting go of enormous amounts of memory (coiuld this be a grabage collection problem?) =============================================