Re: Mac Mathematica & memory requirement
- To: mathgroup at christensen.Cybernetics.NET
- Subject: [mg233] Re: [mg197] Mac Mathematica & memory requirement
- From: Xah Y Lee <xyl10060 at fhda.edu>
- Date: Fri, 25 Nov 1994 21:42:55 -0800 (PST)
On Fri, 18 Nov 1994, David Crawford wrote:
> I want to buy more memory for my new powerbook (520c,
> 68040, no FPU).
> How much do I need to allocate to Mathematica
> non-enhanced ?
How much memory you need depends on what you do with mma. For general
purpose, I'd say 10 M minimum. I use mma to create animations a lot, so I
alawy run it with 20M. I have 9M physical RAM. I am using system 7.1 with
virtual memory. Occasionally I can hear my harddisk spinning swapping
memories, but mostly there's no speed problem with virtual memory in mma
on my setup.
> If I upgrade this powerbook with a plug-in PowerPC chip,
> and upgrade to the PowerMac native version of Mathematica
> will I require more memory than when using the native 680x0
> version ? How much more?
There shouldn't be any difference.
> I am aware that the minimum required memory allocation
> for Mathematica is only a _minimal_ allocation to make
> Mathematica barely run, and that giving mma more memory
> can greatly improve its performance. Is there
> any limit to benefits from more memory ? Is there a
> point where additional memory will yield no additional
> performance ?
Assigning extra memory does not improve mma's performance. It only extend
memory intensive capabilities such as graphics in one session. BTW, as
you know, you can always quit and relaunch when you run out of memory.
BTW, quit and relaunch is the easist way to purge whatever mma kept in
> So how much memory to allocate to Mathematica ?
> 680x0 non enhanced: ___MB
> PowerMac Native: ___MB
If you really enjoy mma and constantly have HUGE projects with lots of data,
buy as much as you can afford. Otherwise, 9M physical RAM along with
virtual memory works for me fine.
Permament email: 74631.731 at compuserve.com
tempory email: xyl10060 at tiptoe.fhda.edu
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