Re: Quit versus Clear["Global`*"]
- To: mathgroup at smc.vnet.net
- Subject: [mg121251] Re: Quit versus Clear["Global`*"]
- From: "tenons at gmail.com" <tenons at gmail.com>
- Date: Tue, 6 Sep 2011 03:57:01 -0400 (EDT)
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On Sep 4, 4:14 am, David Bailey <d... at removedbailey.co.uk> wrote: > On 03/09/2011 13:10, Themis Matsoukas wrote:> What is the difference between quitting the kernel and executing Clear["Global`*"]? > > > Is there a command to quit the kernel, instead of selecting Quit/Local from there Evaluate menu? > > > Thanks > > Quit will quit the kernel. > > Obviously Clear["Global`*"] would not clear information that might end > up in other contexts, whereas Quit will clear everything. > > I never clear the global context - I just quit the kernel one way or > another. Restarting the kernel used to be rather slow, but with the > speed of a modern PC, there really doesn't seem much point doing > anything else unless you specifically wish to preserve some information > that is not in Global`. > > I tend to quit the kernel quite a lot - e.g. between successive runs of > a program - why risk the confusion that can arise when two function > definitions end up coexisting! > > David Baileyhttp://www.dbaileyconsultancy.co.uk I agree whole-heartedly with this post. I've found it the only way to stay out of trouble. I have a related problem that I hope I can get some suggestions for. GIF.exe has a memory leak (reported previously, acknowledged and is on someone's todo list at Wolfram, hopefully) which makes a certain set evaluations (which use ExportString[#,"GIF"]& extensively) unstable. (i.e., MathKernel crashes randomly and unceremoniously, or worse). What I would like to do is divide the set of evaluations into segments, run them successively quitting the MathKernel after each, and then restarting on the next segment. The Quit clears out the buildup in GIF.exe. Obviously I can do this by babysitting and restarting each segment by hand (which I do, at approximately 15 minute intervals, painfully wasting time). [I've tried many things including Uninstall["path/GIF.exe"] 'ing periodically and escaping to the shell to kill the process. Neither improves stability. ] How can I carry this out automatically?